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| <td valign="top" align="left" width="30%">Chapter 11. System Management and Deployment |
| Issues </td><td align="center" width="40%"><a accesskey="h" href="index.html"><img src="../images/db/home.png" alt="Home"></a></td><td valign="top" align="right" width="30%"> Chapter 13. HyperSQL Network Listeners</td> |
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| <div> |
| <h2 class="title"> |
| <a name="dbproperties-chapt"></a>Chapter 12. Properties</h2> |
| </div> |
| <div> |
| <div class="authorgroup"> |
| <div class="author"> |
| <h3 class="author"> |
| <span class="firstname">Fred</span> <span class="surname">Toussi</span> |
| </h3> |
| <div class="affiliation"> |
| <span class="orgname">The HSQL Development Group<br> |
| </span> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div> |
| <p class="releaseinfo">$Revision: 3626 $</p> |
| </div> |
| <div> |
| <div class="legalnotice"> |
| <a name="N13AB9"></a> |
| <p>Copyright 2002-2009 Fred Toussi. Permission is granted to |
| distribute this document without any alteration under the terms of the |
| HSQLDB license. Additional permission is granted to the HSQL Development |
| Group to distribute this document with or without alterations under the |
| terms of the HSQLDB license.</p> |
| </div> |
| </div> |
| <div> |
| <p class="pubdate">$Date: 2010-06-05 07:49:07 -0400 (Sat, 05 Jun 2010) $</p> |
| </div> |
| </div> |
| </div> |
| <div class="toc"> |
| <p> |
| <b>Table of Contents</b> |
| </p> |
| <dl> |
| <dt> |
| <span class="section"><a href="dbproperties-chapt.html#dbproperties_connections-sect">Connections</a></span> |
| </dt> |
| <dd> |
| <dl> |
| <dt> |
| <span class="section"><a href="dbproperties-chapt.html#conn_props-sect">Connection properties</a></span> |
| </dt> |
| </dl> |
| </dd> |
| <dt> |
| <span class="section"><a href="dbproperties-chapt.html#N13C11">Database Properties in Connection URL and Properties</a></span> |
| </dt> |
| </dl> |
| </div> |
| <div class="section" lang="en"> |
| <div class="titlepage"> |
| <div> |
| <div> |
| <h2 class="title" style="clear: both"> |
| <a name="dbproperties_connections-sect"></a>Connections</h2> |
| </div> |
| </div> |
| </div> |
| <p>The normal method of accessing a HyperSQL catalog is via the JDBC |
| Connection interface. An introduction to different methods of providing |
| database services and accessing them can be found in the <a class="link" href="sqlgeneral-chapt.html" title="Chapter 2. SQL Language">SQL Language</a> chapter. |
| Details and examples of how to connect via JDBC are provided in our |
| JavaDoc for <code class="classname"><a class="classname" href="apd.html#JDBCConnection.html-link"> |
| JDBCConnection</a></code>.</p> |
| <p>A uniform method is used to distinguish between different types of |
| connection. The common driver identifier is |
| <code class="literal">jdbc:hsqldb:</code> followed by a protocol identifier |
| (<code class="literal">mem: file: res: hsql: http: hsqls: https:</code>) then |
| followed by host and port identifiers in the case of servers, then |
| followed by database identifier. Additional property / value pairs can be |
| appended to the end of the URL, separated with semicolons.</p> |
| <div class="table"> |
| <a name="N13AD2"></a> |
| <p class="title"> |
| <b>Table 12.1. HyperSQL URL Components</b> |
| </p> |
| <div class="table-contents"> |
| <table summary="HyperSQL URL Components" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; "> |
| <colgroup> |
| <col align="left"> |
| <col align="left"> |
| <col align="left"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Driver and Protocol</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Host and Port</th><th style="border-bottom: 0.5pt solid ; " align="left">Database</th> |
| </tr> |
| </thead> |
| <tbody valign="top"> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"> |
| <table summary="Simple list" border="0" class="simplelist"> |
| <tr> |
| <td><code class="literal">jdbc:hsqldb:mem:</code></td> |
| </tr> |
| </table> |
| </td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top">not available</td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top"> |
| <table summary="Simple list" border="0" class="simplelist"> |
| <tr> |
| <td><code class="literal">accounts</code></td> |
| </tr> |
| </table> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>Lowercase, single-word |
| identifier creates the in-memory database when the first |
| connection is made. Subsequent use of the same Connection URL |
| connects to the existing DB.</p> |
| <p>The old form for the |
| URL, <code class="literal">jdbc:hsqldb:.</code> creates or connects to the |
| same database as the new form for the URL, |
| <code class="literal">jdbc:hsqldb:mem:.</code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"> |
| <table summary="Simple list" border="0" class="simplelist"> |
| <tr> |
| <td><code class="literal">jdbc:hsqldb:file:</code></td> |
| </tr> |
| </table> |
| </td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top">not available</td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top"> |
| <table summary="Simple list" border="0" class="simplelist"> |
| <tr> |
| <td><code class="filename">mydb</code></td> |
| </tr> |
| <tr> |
| <td><code class="filename">/opt/db/accounts</code></td> |
| </tr> |
| <tr> |
| <td><code class="filename">C:/data/mydb</code></td> |
| </tr> |
| </table> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>The file path specifies the |
| database file. In the above examples the first one refers to a set |
| of mydb.* files in the directory where the |
| <code class="literal">java</code>command for running the application was |
| issued. The second and third examples refer to absolute paths on |
| the host machine.</p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"> |
| <table summary="Simple list" border="0" class="simplelist"> |
| <tr> |
| <td><code class="literal">jdbc:hsqldb:res:</code></td> |
| </tr> |
| </table> |
| </td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top">not available</td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top"> |
| <table summary="Simple list" border="0" class="simplelist"> |
| <tr> |
| <td><code class="filename">/adirectory/dbname</code></td> |
| </tr> |
| </table> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top">Database files can be loaded from |
| one of the jars specified as part of the <code class="literal">Java</code> |
| command the same way as resource files are accessed in Java |
| programs. The <code class="literal">/adirectory</code> above stands for a |
| directory in one of the jars.</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"> |
| <table summary="Simple list" border="0" class="simplelist"> |
| <tr> |
| <td><code class="literal">jdbc:hsqldb:hsql:</code></td> |
| </tr> |
| <tr> |
| <td><code class="literal">jdbc:hsqldb:hsqls:</code></td> |
| </tr> |
| <tr> |
| <td><code class="literal">jdbc:hsqldb:http:</code></td> |
| </tr> |
| <tr> |
| <td><code class="literal">jdbc:hsqldb:https:</code></td> |
| </tr> |
| </table> |
| </td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"> |
| <table summary="Simple list" border="0" class="simplelist"> |
| <tr> |
| <td><code class="literal">//localhost</code></td> |
| </tr> |
| <tr> |
| <td><code class="literal">//192.0.0.10:9500</code></td> |
| </tr> |
| <tr> |
| <td><code class="literal">//dbserver.somedomain.com</code></td> |
| </tr> |
| </table> |
| </td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top"> |
| <table summary="Simple list" border="0" class="simplelist"> |
| <tr> |
| <td><code class="literal">/an_alias</code></td> |
| </tr> |
| <tr> |
| <td><code class="literal">/enrollments</code></td> |
| </tr> |
| <tr> |
| <td><code class="literal">/quickdb</code></td> |
| </tr> |
| </table> |
| </td> |
| </tr> |
| <tr> |
| <td style="" colspan="3" align="left" valign="top"> |
| <p>The host and port specify |
| the IP address or host name of the server and an optional port |
| number. The database to connect to is specified by an alias. This |
| alias is a lowercase string defined in the |
| <code class="filename">server.properties</code> file to refer to an actual |
| database on the file system of the server or a transient, |
| in-memory database on the server. The following example lines in |
| <code class="filename">server.properties</code> or |
| <code class="filename">webserver.properties</code> define the database |
| aliases listed above and accessible to clients to refer to |
| different file and in-memory databases.</p> |
| <p>The old form |
| for the server URL, e.g., |
| <code class="literal">jdbc:hsqldb:hsql//localhost</code> connects to the |
| same database as the new form for the URL, |
| <code class="literal">jdbc:hsqldb:hsql//localhost/</code> where the alias is |
| a zero length string.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <br class="table-break"> |
| <div class="section" lang="en"> |
| <div class="titlepage"> |
| <div> |
| <div> |
| <h3 class="title"> |
| <a name="conn_props-sect"></a>Connection properties</h3> |
| </div> |
| </div> |
| </div> |
| <p>Each JDBC Connection to a database can specify connection |
| properties. The properties <span class="property">user</span> and |
| <span class="property">password</span> are always required. In 2.0 the following |
| optional properties can also be used.</p> |
| <p>Connection properties are specified either by establishing the |
| connection via the method call below, or the property can be appended to |
| the full Connection URL.</p> |
| <pre class="programlisting"> DriverManager.getConnection (String url, Properties info);</pre> |
| <div class="table"> |
| <a name="N13B9C"></a> |
| <p class="title"> |
| <b>Table 12.2. Connection Properties</b> |
| </p> |
| <div class="table-contents"> |
| <table summary="Connection Properties" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; "> |
| <colgroup> |
| <col align="left"> |
| <col align="left"> |
| <col align="left"> |
| </colgroup> |
| <tbody valign="top"> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">get_column_name</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">column name in ResultSet</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>This property is used for |
| compatibility with other JDBC driver implementations. When true |
| (the default), <code class="methodname">ResultSet.getColumnName(int |
| c)</code> returns the underlying column name. This |
| property can be specified differently for different connections |
| to the same database.</p> |
| <p>The default is true. When the |
| property is false, the above method returns the same value as |
| <code class="methodname">ResultSet.getColumnLabel(int column)</code> |
| Example below:</p> |
| <pre class="programlisting"> jdbc:hsqldb:hsql://localhost/enrollments;get_column_name=false</pre> |
| <p>When |
| a ResultSet is used inside a user-defined stored procedure, the |
| default, true, is always used for this property.</p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">ifexists</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">connect only if database already exists</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>Has an effect only with |
| <em class="glossterm">mem:</em> and <em class="glossterm">file:</em> |
| database. When true, will not create a new database if one does |
| not already exist for the URL.</p> |
| <p>When the property is |
| false (the default), a new <em class="glossterm">mem:</em> or |
| <em class="glossterm">file:</em> database will be created if it does |
| not exist.</p> |
| <p>Setting the property to true is useful |
| when troubleshooting as no database is created if the URL is |
| malformed. Example below:</p> |
| <pre class="programlisting"> jdbc:hsqldb:file:enrollments;ifexists=true</pre> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">shutdown</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">shut down the database when the last connection is |
| closed</td> |
| </tr> |
| <tr> |
| <td style="" colspan="3" align="left" valign="top"> |
| <p>If this property is |
| <code class="literal">true</code>, when the last connection to a database |
| is closed, the database is automatically shut down. The property |
| takes effect only when the first connection is made to the |
| database. This means the connection that opens the database. It |
| has no effect if used with subsequent connections.</p> |
| |
| <p>This command has two uses. One is for test suites, where |
| connections to the database are made from one JVM context, |
| immediately followed by another context. The other use is for |
| applications where it is not easy to configure the environment |
| to shutdown the database. Examples reported by users include web |
| application servers, where the closing of the last connection |
| coincides with the web app being shut |
| down.</p> |
| <pre class="programlisting"> jdbc:hsqldb:file:enrollments;shutdown=true</pre> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <br class="table-break"> |
| <p>In addition, when a connection to an |
| <em class="glossterm">in-process</em> database creates a new database, or |
| opens an existing database (i.e. it is the first connection made to the |
| database by the application), all the user-defined database properties |
| can be specified as URL properties. This can be used to specify |
| properties to enforce more strict SQL adherence, or to change |
| cache_scale or similar properties before the database files are created. |
| However, for new databases, it is recommended to use the SET PROPERTY |
| command for such settings.</p> |
| </div> |
| </div> |
| <div class="section" lang="en"> |
| <div class="titlepage"> |
| <div> |
| <div> |
| <h2 class="title" style="clear: both"> |
| <a name="N13C11"></a>Database Properties in Connection URL and Properties</h2> |
| </div> |
| </div> |
| </div> |
| <p>The database engine has several properties that are listed in the |
| <a class="link" href="deployment-chapt.html" title="Chapter 11. System Management and Deployment Issues">System Management and Deployment |
| Issues</a> |
| chapter. These properties can be changed via SQL commands after a |
| connection is made to the database. It is possible to specify all of these |
| properties in the connection properties on as part of the URL string when |
| the first connection is made to a new file: or mem: database. This allows |
| the properties to be set without using any SQL commands. The corresponding |
| SQL command is given for each property.</p> |
| <p>Management of properties has changed since version 1.8. The old SET |
| PROPERTY does not change a property and is retained to simplify |
| application upgrades.</p> |
| <p>In the example URL below, two properties are set for the first |
| connection to a new database. If the properties are used for connection to |
| an existing database, they are ignored.</p> |
| <pre class="programlisting"> jdbc:hsqldb:file:enrollments;hsqldb.cache_rows=10000;hsqldb.nio_data_file=false</pre> |
| <p>In the table below, database properties that can be used as part of |
| the URL below are given. For each property that can also be set with an |
| SQL statement, the statement is also given. These statements are described |
| in the <a class="link" href="deployment-chapt.html" title="Chapter 11. System Management and Deployment Issues">System Management and Deployment |
| Issues</a> chapter.</p> |
| <div class="table"> |
| <a name="N13C26"></a> |
| <p class="title"> |
| <b>Table 12.3. Database-specific Property File Properties</b> |
| </p> |
| <div class="table-contents"> |
| <table summary="Database-specific Property File Properties" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; "> |
| <colgroup> |
| <col align="left"> |
| <col align="left"> |
| <col align="left"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Value</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th> |
| </tr> |
| </thead> |
| <tbody valign="top"> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">check_props</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">checks the validity of the connection properties</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>If the property is true, |
| every database property that is specified on the URL or in |
| connection properties is checked and if it is not used correctly, |
| an error is returned</p> |
| <p> |
| <pre class="programlisting">this property cannot be set with an SQL statement</pre> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">crypt_lobs</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">encryption of lobs</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>If the property is true, the |
| contents of the .lobs file is encrypted as |
| well.</p> |
| <p> |
| <pre class="programlisting">this property cannot be set with an SQL statement</pre> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">crypt_key</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">none</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">encryption</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>The cipher key for an |
| encrypted database</p> |
| <p> |
| <pre class="programlisting">this property cannot be set with an SQL statement</pre> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">crypt_provider</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">none</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">encryption</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>The fully-qualified class |
| name of the cryptography provider. This property is not used for |
| the default security provider.</p> |
| <p> |
| <pre class="programlisting">this property cannot be set with an SQL statement</pre> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">crypt_type</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">none</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">encryption</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>The cipher |
| specification.</p> |
| <p> |
| <pre class="programlisting">this property cannot be set with an SQL statement</pre> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">read_only</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">readonly database</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>This property is a special |
| property that can be added manually to the .properties file, or |
| included in the URL or connection properties. When this property |
| is true, the database becomes |
| readonly.</p> |
| <p> |
| <pre class="programlisting">this property cannot be set with an SQL statement</pre> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">files_read_only</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">readonly files database</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>This property is used |
| similarly to the hsqldb.read_only property. When this property is |
| true, CACHED and TEXT tables are readonly but memory files are |
| not. Any change to the data is not persisted to database |
| files.</p> |
| <p> |
| <pre class="programlisting">this property cannot be set with an SQL statement</pre> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.log_data</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">recovery log</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>This property can be set to |
| false when database recovery in the event of an unexpected crash |
| is not necessary. A database that is used as a temporary cache is |
| an example. Regardless of the value of this property, if there is |
| a proper shutdown of the database, all the change data is |
| stored.</p> |
| <p> |
| <pre class="programlisting">this property cannot be set with an SQL statement</pre> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">sql.enforce_names</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">enforcing SQL keywords</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>This property, when set |
| true, prevents SQL keywords being used for database object names |
| such as columns and tables.</p> |
| <p> |
| <pre class="programlisting">SET DATABASE SQL NAMES { TRUE | FALSE }</pre> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">sql.enforce_size</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">trimming and padding string columns.</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>This property is the same as |
| sql.enforce_strict_size</p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">sql.enforce_strict_size</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">size enforcement and padding string columns</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>Conforms to SQL standards |
| for size and precision of data types. When true, all CHARACTER, |
| VARCHAR, NUMERIC and DECIMAL values that are in a row affected by |
| an INSERT INTO or UPDATE statement are checked against the size |
| specified in the SQL table definition. An exception is thrown if |
| the value is too long. Also all CHARACTER values that are shorter |
| than the specified size are padded with |
| spaces.</p> |
| <p> |
| <pre class="programlisting">SET DATABASE SQL SIZE { TRUE | FALSE }</pre> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">sql.enforce_refs</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">enforcing column reference disambiguation</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>This property, when set |
| true, causes an error when an SQL statements contains column |
| references that can be resovled by more than one table name or |
| alias. In effect forces such column references to have a table |
| name or table alias qualifier.</p> |
| <p> |
| <pre class="programlisting">SET DATABASE SQL REFERENCES { TRUE | FALSE }</pre> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">runtime.gc_interval</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">0</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">forced garbage collection</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>This setting forces garbage |
| collection each time a set number of result set row or cache row |
| objects are created. The default, "0" means no garbage collection |
| is forced by the program.</p> |
| <p> |
| <pre class="programlisting">SET DATABASE GC <numeric value></pre> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.default_table_type</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">memory</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">type of table created with unqualified CREATE TABLE</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>The CREATE TABLE command |
| results in a MEMORY table by default. Setting the value |
| <span class="emphasis"><em>cached</em></span> for this property will result in a |
| cached table by default. The qualified forms such as CREATE MEMORY |
| TABLE or CREATE CACHED TABLE are not affected at all by this |
| property.</p> |
| <p> |
| <pre class="programlisting">SET DATABASE DEFAULT TABLE TYPE { CACHED | MEMORY }</pre> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.applog</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">0</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">application logging level</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>The default level 0 |
| indicates no logging. Level 1 results in events related to |
| persistence to be logged, including any failures. Level 2 |
| indicates all events, including ordinary events. The events are |
| logged in a file ending with |
| ".app.log".</p> |
| <p> |
| <pre class="programlisting">SET DATABASE EVENT LOG LEVEL { 0 | 1 | 2 }</pre> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.result_max_memory_rows</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">0</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">amount of result rows that are kept in memory</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>Sets the maximum number of |
| rows of each result set and other internal temporary table that is |
| held in memory. </p> |
| <p> |
| <pre class="programlisting">SET DATABASE DEFAULT RESULT MEMORY ROWS <unsigned integer literal></pre> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.tx</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">locks</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">database transaction control mode</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>Indicates the transaction |
| control mode for the database. The values, locks, mvlocks and mvcc |
| are allowed.</p> |
| <p> |
| <pre class="programlisting">SET DATABASE TRANSACTION CONTROL { LOCKS | MVLOCKS | MVCC }</pre> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.cache_rows</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">50000</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">maximum number of rows in memory cache</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>Indicates the maximum number |
| of rows of cached tables that are held in memory.</p> |
| <p>The |
| value can range between 100-1,000,000. If the value is set via SET |
| FILES then it becomes effective after the next database SHUTDOWN |
| or CHECKPOINT.</p> |
| <p>The property is changed via the |
| <code class="literal">SET FILES CACHE ROWS nnn</code> SQL |
| command.</p> |
| <p> |
| <pre class="programlisting">SET FILES CACHE ROWS <numeric value></pre> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.cache_size</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">10000</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">memory cache size</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>Indicates the total size (in |
| kilobytes) of rows in the memory cache used with cached tables. |
| This size is calculated as the binary size of the rows, for |
| example an INTEGER is 4 bytes. The actual memory size used by the |
| objects is 2 to 4 times this value. This depends on the types of |
| objects in database rows, for example with binary objects the |
| factor is less than 2, with character strings, the factor is just |
| over 2 and with date and timestamp objects the factor is over |
| 3.</p> |
| <p>The value can range between 100-1,000,000. The |
| default is 10,000, representing 10,000 kilobytes. If the value is |
| set via SET FILES then it becomes effective after the next |
| database SHUTDOWN or CHECKPOINT.</p> |
| <p> |
| <pre class="programlisting">SET FILES CACHE SIZE <numeric value></pre> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.inc_backup</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">incremental backup of data file</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>During updates, the contents |
| of the .data file are modified. When this property is true, the |
| modified contents are backed up gradually. This causes a marginal |
| slowdown in operations, but allows fast checkpoint and |
| shutdown.</p> |
| <p>When the property is false, the .data file |
| is backed up entirely at the time of checkpoint and shutdown. Up |
| to version 1.8, HSQLDB supported only full |
| backup.</p> |
| <p> |
| <pre class="programlisting">SET FILES INCREMENT BACKUP { TRUE | FALSE }</pre> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.lock_file</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">use of lock file</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>By default, a lock file is |
| created for each file database that is opened for read and write. |
| This property can be specified with the value false to prevent the |
| lock file from being created. This usage is not recommended but |
| may be desirable when flash type storage is |
| used.</p> |
| <p> |
| <pre class="programlisting">this property cannot be set with an SQL statement</pre> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.log_data</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">logging data change</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>When |
| <code class="literal">false</code> is specified, no data logging takes |
| place. A checkpoint or shutdown still rewrites the |
| <code class="literal">.script</code> file and saves the |
| <code class="literal">.backup</code> file according to the other |
| settings.</p> |
| <p> |
| <pre class="programlisting">SET FILES LOG { TRUE | FALSE }</pre> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.log_size</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">50</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">size of log when checkpoint is performed</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>The value is the size (in |
| megabytes) that the <code class="literal">.log</code> file can reach before |
| an automatic checkpoint occurs. A checkpoint rewrites the |
| <code class="literal">.script</code> file and clears the |
| <code class="literal">.log</code> file.</p> |
| <p> |
| <pre class="programlisting">SET FILES LOG SIZE <numeric value></pre> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.nio_data_file</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">use of nio access methods for the .data file</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>When HyperSQL is compiled |
| and run in Java 1.4 or higher, setting this property to |
| <code class="literal">false</code> will avoid the use of nio access methods, |
| resulting in somewhat reduced speed. If the data file is larger |
| than 256MB when it is first opened, nio access methods are not |
| used. Also, if the file gets larger than the amount of available |
| computer memory that needs to be allocated for nio access, non-nio |
| access methods are used.</p> |
| <p>If used before defining any |
| CACHED table, it applies immediately, otherwise it comes into |
| effect after a SHUTDOWN and restart or |
| CHECKPOINT.</p> |
| <p> |
| <pre class="programlisting">SET FILES NIO { TRUE | FALSE }</pre> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.translate_dti_types</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">usage of type codes for advanced type datetime |
| types</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>If the property is true, the |
| datetime WITH TIME ZONE types and INTERVAL types are represented |
| as JDBC datetime types without time zone and the VARCHAR type |
| respectively.</p> |
| <p> |
| <pre class="programlisting">this property cannot be set with an SQL statement</pre> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.write_delay</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">write delay for writing log file entries</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>If the property is true, the |
| default WRITE DELAY property of the database is used, which is |
| 1000 milliseconds. If the property is false, the WRITE DELAY is |
| set to 0 seconds. The SQL command for this property allows more |
| precise control over the property.</p> |
| <p> |
| <pre class="programlisting">SET FILES WRITE DELAY {{ TRUE | FALSE } | <seconds value> | <milliseconds value> MILLIS</pre> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.write_delay_millis</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">1000</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">write delay for writing log file entries</td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> |
| <p>If the property is used, the |
| WRITE DELAY property of the database is set the given value. The |
| SQL command for this property allows the same level of control |
| over the property.</p> |
| <p> |
| <pre class="programlisting">SET FILES WRITE DELAY {{ TRUE | FALSE } | <seconds value> | <milliseconds value> MILLIS</pre> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td> |
| </tr> |
| <tr> |
| <td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">textdb.*</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">0</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">default properties for new text tables</td> |
| </tr> |
| <tr> |
| <td style="" colspan="3" align="left" valign="top"> |
| <p>Properties that override the |
| database engine defaults for newly created text tables. Settings |
| in the text table <code class="literal">SET <tablename> SOURCE <source |
| string> </code>command override both the engine defaults and |
| the database properties defaults. Individual |
| <span class="property">textdb.*</span> properties are listed in the <a class="link" href="texttables-chapt.html" title="Chapter 5. Text Tables">Text Tables</a> |
| chapter.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <br class="table-break"> |
| <p>When connecting to an <em class="glossterm">in-process</em> database |
| creates a new database, or opens an existing database (i.e. it is the |
| first connection made to the database by the application), all the |
| user-defined database properties listed in this section can be specified |
| as URL properties.</p> |
| <p>When HSQLDB is used in OpenOffice.org, some property values will |
| have a different default. The properties and values are:</p> |
| <p>hsqldb.default_table_type=cached hsqldb.cache_rows=25000; |
| hsqldb.cache_size=6000; hsqldb.log_size=10; hsqldb.nio_data_file=false; |
| sql.enforce_strict_size=true</p> |
| </div> |
| </div> |
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| <tr> |
| <td valign="top" align="left" width="40%">Chapter 11. System Management and Deployment |
| Issues </td><td align="center" width="20%"><a accesskey="h" href="index.html"><img src="../images/db/home.png" alt="Home"></a></td><td valign="top" align="right" width="40%"> Chapter 13. HyperSQL Network Listeners</td> |
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