提交 c3ec8dbc authored 作者: Thomas Mueller's avatar Thomas Mueller

Documentation.

上级 abf4fc78
......@@ -17,7 +17,14 @@ Change Log
<h1>Change Log</h1>
<h2>Next Version (unreleased)</h2>
<ul><li>CURRENT_TIMESTAMP() and so on now return the same value within a transaction.
<ul><li>When altering a table with triggers, new triggers are created
and initialized with a table name that ends with tableName_COPY_x_y.
The plan is that this will not be required in future versions.
</li><li>If some of the file system operations failed, System.gc() was called in a loop.
Now it is called once at most.
</li><li>Triggers (including the fulltext search) could throw the exception
'Unexpected code path' in Session.log.
</li><li>CURRENT_TIMESTAMP() and so on now return the same value within a transaction.
</li><li>The statement CALL no longer converts an ARRAY return value to a list of values.
Now an ARRAY is returned.
</li><li>VALUES is now supported as a standalone command and as a table source:
......
......@@ -143,7 +143,7 @@ encrypted using AES-128 and XTEA encryption algorithms
</li><li>Support for multi-dimensional indexes
</li><li>CSV (comma separated values) file support
</li><li>Support for linked tables, and a built-in virtual 'range' table
</li><li><code>EXPLAIN PLAN</code> support, sophisticated trace options
</li><li>Supports the <code>EXPLAIN PLAN</code> statement; sophisticated trace options
</li><li>Database closing can be delayed or disabled to improve the performance
</li><li>Web-based Console application (translated to many languages) with autocomplete
</li><li>The database can generate SQL script files
......@@ -156,15 +156,22 @@ encrypted using AES-128 and XTEA encryption algorithms
</li></ul>
<h2 id="comparison">Comparison to Other Database Engines</h2>
<p>
This comparison is based on
H2 1.3,
<a href="http://db.apache.org/derby">Apache Derby version 10.8</a>,
<a href="http://hsqldb.org">HSQLDB 2.2</a>,
<a href="http://mysql.com">MySQL 5.5</a>,
<a href="http://www.postgresql.org">PostgreSQL 9.0</a>.
</p>
<table class="main">
<tr>
<th>Feature</th>
<th>H2</th>
<th><a href="http://db.apache.org/derby">Derby</a></th>
<th><a href="http://hsqldb.org">HSQLDB</a></th>
<th><a href="http://mysql.com">MySQL</a></th>
<th><a href="http://www.postgresql.org">PostgreSQL</a></th>
<th>Derby</th>
<th>HSQLDB</th>
<th>MySQL</th>
<th>PostgreSQL</th>
</tr><tr>
<td>Pure Java</td>
<td class="compareY">Yes</td>
......@@ -197,7 +204,7 @@ encrypted using AES-128 and XTEA encryption algorithms
</tr><tr>
<td>Explain Plan</td>
<td class="compareY">Yes</td>
<td class="compareN">No</td>
<td class="compareY">Yes *12</td>
<td class="compareY">Yes</td>
<td class="compareY">Yes</td>
<td class="compareY">Yes</td>
......@@ -237,7 +244,7 @@ encrypted using AES-128 and XTEA encryption algorithms
<td class="compareY">Yes</td>
<td class="compareY">Yes</td>
</tr><tr>
<td>User-Defined Datatypes</td>
<td>Domains (User-Defined Types)</td>
<td class="compareY">Yes</td>
<td class="compareN">No</td>
<td class="compareY">Yes</td>
......@@ -288,14 +295,14 @@ encrypted using AES-128 and XTEA encryption algorithms
</tr><tr>
<td>Sequences</td>
<td class="compareY">Yes</td>
<td class="compareN">No</td>
<td class="compareY">Yes</td>
<td class="compareY">Yes</td>
<td class="compareN">No</td>
<td class="compareY">Yes</td>
</tr><tr>
<td>Limit and Offset</td>
<td class="compareY">Yes</td>
<td class="compareN">No</td>
<td class="compareY">Yes *13</td>
<td class="compareY">Yes</td>
<td class="compareY">Yes</td>
<td class="compareY">Yes</td>
......@@ -323,7 +330,7 @@ encrypted using AES-128 and XTEA encryption algorithms
</tr><tr>
<td>Case Insensitive Columns</td>
<td class="compareY">Yes</td>
<td class="compareN">No</td>
<td class="compareY">Yes *14</td>
<td class="compareY">Yes</td>
<td class="compareY">Yes</td>
<td class="compareY">Yes *6</td>
......@@ -361,8 +368,11 @@ encrypted using AES-128 and XTEA encryption algorithms
*8 Derby doesn't support standard compliant information schema tables.<br />
*9 When using MVCC (multi version concurrency).<br />
*10 Derby and HSQLDB
<a href="http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29">don't hide hide data patterns well</a>.<br />
*11 The MULTI_THREADED option is not enabled by default, and not yet supported when using MVCC.
<a href="http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29">don't hide data patterns well</a>.<br />
*11 The MULTI_THREADED option is not enabled by default, and not yet supported when using MVCC.<br />
*12 Derby doesn't support the <code>EXPLAIN</code> statement, but it supports runtime statistics and retrieving statement execution plans.<br />
*13 Derby doesn't support the syntax <code>LIMIT .. [OFFSET ..]</code>, however it supports <code>FETCH FIRST .. ROW[S] ONLY</code>.<br />
*14 Using collations.
</p>
<h3>DaffodilDb and One$Db</h3>
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