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<div class="aboutLanguage"><b>Berkeley DB</b><br><font size="-1"> version 18.1.40</font></div>
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<div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">com.sleepycat.db</a></div>
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<h2 title="Class TransactionConfig" class="title">Class TransactionConfig</h2>
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<li>java.lang.Object</li>
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<pre>public class <span class="typeNameLabel">TransactionConfig</span>
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extends java.lang.Object
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implements java.lang.Cloneable</pre>
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<div class="block">Specifies the attributes of a database environment transaction.</div>
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<td class="colFirst"><code>static <a href="TransactionConfig.html" title="class in com.sleepycat.db">TransactionConfig</a></code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#DEFAULT">DEFAULT</a></span></code></th>
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<td class="colLast">
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<div class="block">Default configuration used if null is passed to methods that create a
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transaction.</div>
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<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#TransactionConfig--">TransactionConfig</a></span>()</code></th>
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<div class="block">An instance created using the default constructor is initialized
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with the system's default settings.</div>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span><span id="t6" class="tableTab"><span><a href="javascript:show(32);">Deprecated Methods</a></span><span class="tabEnd"> </span></span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colSecond" scope="col">Method</th>
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<th class="colLast" scope="col">Description</th>
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<tr id="i0" class="altColor">
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<td class="colFirst"><code>boolean</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getBulk--">getBulk</a></span>()</code></th>
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<td class="colLast">
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<div class="block">Return true if the Bulk attribute is set.</div>
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</td>
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</tr>
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<tr id="i1" class="rowColor">
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<td class="colFirst"><code>boolean</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getDegree2--">getDegree2</a></span>()</code></th>
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<td class="colLast">
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<div class="block"><span class="deprecatedLabel">Deprecated.</span>
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<div class="deprecationComment">This has been replaced by <a href="#getReadCommitted--"><code>getReadCommitted()</code></a> to conform to ANSI
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database isolation terminology.</div>
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</div>
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</td>
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</tr>
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<tr id="i2" class="altColor">
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<td class="colFirst"><code>boolean</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getDirtyRead--">getDirtyRead</a></span>()</code></th>
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<td class="colLast">
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<div class="block"><span class="deprecatedLabel">Deprecated.</span>
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<div class="deprecationComment">This has been replaced by <a href="#getReadUncommitted--"><code>getReadUncommitted()</code></a> to conform to ANSI
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database isolation terminology.</div>
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</div>
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</td>
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</tr>
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<tr id="i3" class="rowColor">
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<td class="colFirst"><code>boolean</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getNoSync--">getNoSync</a></span>()</code></th>
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<td class="colLast">
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<div class="block">Return if the transaction is configured to not write or synchronously
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flush the log it when commits.</div>
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</td>
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</tr>
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<tr id="i4" class="altColor">
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<td class="colFirst"><code>boolean</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getNoWait--">getNoWait</a></span>()</code></th>
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<td class="colLast">
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<div class="block">Return if the transaction is configured to not wait if a lock
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request cannot be immediately granted.</div>
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</td>
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</tr>
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<tr id="i5" class="rowColor">
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<td class="colFirst"><code>boolean</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getReadCommitted--">getReadCommitted</a></span>()</code></th>
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<td class="colLast">
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<div class="block">Return if the transaction is configured for read committed isolation.</div>
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</td>
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</tr>
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<tr id="i6" class="altColor">
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<td class="colFirst"><code>boolean</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getReadUncommitted--">getReadUncommitted</a></span>()</code></th>
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<td class="colLast">
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<div class="block">Return if read operations performed by the transaction are configured to
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return modified but not yet committed data.</div>
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</td>
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</tr>
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<tr id="i7" class="rowColor">
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<td class="colFirst"><code>boolean</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getSnapshot--">getSnapshot</a></span>()</code></th>
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<td class="colLast">
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<div class="block">Return true if the transaction is configured for Snapshot Isolation.</div>
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</td>
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</tr>
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<tr id="i8" class="altColor">
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<td class="colFirst"><code>boolean</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getSync--">getSync</a></span>()</code></th>
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<td class="colLast">
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<div class="block">Return if the transaction is configured to write and synchronously
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flush the log it when commits.</div>
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</td>
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</tr>
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<tr id="i9" class="rowColor">
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<td class="colFirst"><code>boolean</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getWait--">getWait</a></span>()</code></th>
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<td class="colLast">
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<div class="block">Return if the transaction is configured to wait if a lock
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request cannot be immediately granted.</div>
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</td>
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</tr>
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<tr id="i10" class="altColor">
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<td class="colFirst"><code>boolean</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getWriteNoSync--">getWriteNoSync</a></span>()</code></th>
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<td class="colLast">
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<div class="block">Return if the transaction is configured to write but not synchronously
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flush the log it when commits.</div>
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</td>
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</tr>
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<tr id="i11" class="rowColor">
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<td class="colFirst"><code>void</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setBulk-boolean-">setBulk</a></span>​(boolean bulk)</code></th>
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<td class="colLast">
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<div class="block">Configures the transaction to enable the transactional bulk insert
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optimization.</div>
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</td>
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</tr>
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<tr id="i12" class="altColor">
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<td class="colFirst"><code>void</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setDegree2-boolean-">setDegree2</a></span>​(boolean degree2)</code></th>
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<td class="colLast">
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<div class="block"><span class="deprecatedLabel">Deprecated.</span>
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<div class="deprecationComment">This has been replaced by <a href="#setReadCommitted-boolean-"><code>setReadCommitted(boolean)</code></a> to conform to ANSI
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database isolation terminology.</div>
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</div>
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</td>
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</tr>
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<tr id="i13" class="rowColor">
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<td class="colFirst"><code>void</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setDirtyRead-boolean-">setDirtyRead</a></span>​(boolean dirtyRead)</code></th>
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<td class="colLast">
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<div class="block"><span class="deprecatedLabel">Deprecated.</span>
|
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<div class="deprecationComment">This has been replaced by <a href="#setReadUncommitted-boolean-"><code>setReadUncommitted(boolean)</code></a> to conform to ANSI
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database isolation terminology.</div>
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</div>
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</td>
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</tr>
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<tr id="i14" class="altColor">
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<td class="colFirst"><code>void</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setNoSync-boolean-">setNoSync</a></span>​(boolean noSync)</code></th>
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<td class="colLast">
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<div class="block">Configure the transaction to not write or synchronously flush the log
|
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it when commits.</div>
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</td>
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</tr>
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<tr id="i15" class="rowColor">
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<td class="colFirst"><code>void</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setNoWait-boolean-">setNoWait</a></span>​(boolean noWait)</code></th>
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<td class="colLast">
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<div class="block">Configure the transaction to not wait if a lock request cannot be
|
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immediately granted.</div>
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</td>
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</tr>
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<tr id="i16" class="altColor">
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<td class="colFirst"><code>void</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setReadCommitted-boolean-">setReadCommitted</a></span>​(boolean readCommitted)</code></th>
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<td class="colLast">
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<div class="block">Configure the transaction for read committed isolation.</div>
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</td>
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</tr>
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<tr id="i17" class="rowColor">
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<td class="colFirst"><code>void</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setReadUncommitted-boolean-">setReadUncommitted</a></span>​(boolean readUncommitted)</code></th>
|
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<td class="colLast">
|
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<div class="block">Configure read operations performed by the transaction to return modified
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but not yet committed data.</div>
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</td>
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</tr>
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<tr id="i18" class="altColor">
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<td class="colFirst"><code>void</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setSnapshot-boolean-">setSnapshot</a></span>​(boolean snapshot)</code></th>
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<td class="colLast">
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<div class="block">This transaction will execute with snapshot isolation.</div>
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</td>
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</tr>
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<tr id="i19" class="rowColor">
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<td class="colFirst"><code>void</code></td>
|
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setSync-boolean-">setSync</a></span>​(boolean sync)</code></th>
|
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<td class="colLast">
|
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<div class="block">Configure the transaction to write and synchronously flush the log
|
|
it when commits.</div>
|
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</td>
|
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</tr>
|
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<tr id="i20" class="altColor">
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<td class="colFirst"><code>void</code></td>
|
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setWait-boolean-">setWait</a></span>​(boolean wait)</code></th>
|
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<td class="colLast">
|
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<div class="block">Configure the transaction to wait if a lock request cannot be
|
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immediately granted.</div>
|
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</td>
|
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</tr>
|
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<tr id="i21" class="rowColor">
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<td class="colFirst"><code>void</code></td>
|
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setWriteNoSync-boolean-">setWriteNoSync</a></span>​(boolean writeNoSync)</code></th>
|
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<td class="colLast">
|
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<div class="block">Configure the transaction to write but not synchronously flush the log
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it when commits.</div>
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</td>
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<h3>Methods inherited from class java.lang.Object</h3>
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<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<pre>public static final <a href="TransactionConfig.html" title="class in com.sleepycat.db">TransactionConfig</a> DEFAULT</pre>
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<div class="block">Default configuration used if null is passed to methods that create a
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<pre>public TransactionConfig()</pre>
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with the system's default settings.</div>
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<pre class="methodSignature">public void setReadCommitted​(boolean readCommitted)</pre>
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<div class="block">Configure the transaction for read committed isolation.
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<p>
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This ensures the stability of the current data item read by the
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cursor but permits data read by this transaction to be modified or
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>readCommitted</code> - If true, configure the transaction for read committed isolation.</dd>
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<dt><span class="returnLabel">Returns:</span></dt>
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<p>
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This ensures the stability of the current data item read by the
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cursor but permits data read by this transaction to be modified or
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deleted prior to the commit of the transaction.
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>degree2</code> - If true, configure the transaction for read committed isolation.
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>If the transaction is configured for read committed isolation.
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<pre class="methodSignature">public void setReadUncommitted​(boolean readUncommitted)</pre>
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<div class="block">Configure read operations performed by the transaction to return modified
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but not yet committed data.
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<p></div>
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<dl>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>readUncommitted</code> - If true, configure read operations performed by the transaction to return
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modified but not yet committed data.</dd>
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return modified but not yet committed data.
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>If read operations performed by the transaction are configured to return
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modified but not yet committed data.</dd>
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public void setDirtyRead​(boolean dirtyRead)</pre>
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<div class="deprecationBlock"><span class="deprecatedLabel">Deprecated.</span>
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<div class="deprecationComment">This has been replaced by <a href="#setReadUncommitted-boolean-"><code>setReadUncommitted(boolean)</code></a> to conform to ANSI
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database isolation terminology.</div>
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<div class="block">Configure read operations performed by the transaction to return modified
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but not yet committed data.
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>dirtyRead</code> - If true, configure read operations performed by the transaction to return
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<div class="deprecationBlock"><span class="deprecatedLabel">Deprecated.</span>
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<div class="deprecationComment">This has been replaced by <a href="#getReadUncommitted--"><code>getReadUncommitted()</code></a> to conform to ANSI
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database isolation terminology.</div>
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return modified but not yet committed data.
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>If read operations performed by the transaction are configured to return
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modified but not yet committed data.
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<pre class="methodSignature">public void setNoSync​(boolean noSync)</pre>
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<div class="block">Configure the transaction to not write or synchronously flush the log
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it when commits.
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<p>
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This behavior may be set for a database environment using the
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Environment.setMutableConfig method. Any value specified to this method
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overrides that setting.
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<p>
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The default is false for this class and the database environment.
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<p></div>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>noSync</code> - If true, transactions exhibit the ACI (atomicity, consistency, and
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isolation) properties, but not D (durability); that is, database
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integrity will be maintained, but if the application or system
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fails, it is possible some number of the most recently committed
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transactions may be undone during recovery. The number of
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transactions at risk is governed by how many log updates can fit
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into the log buffer, how often the operating system flushes dirty
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buffers to disk, and how often the log is checkpointed.</dd>
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<div class="block">Return if the transaction is configured to not write or synchronously
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flush the log it when commits.
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>If the transaction is configured to not write or synchronously flush
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the log it when commits.</dd>
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<div class="block">Configure the transaction to not wait if a lock request cannot be
|
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immediately granted.
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<p>
|
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The default is false for this class and the database environment.
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>noWait</code> - If true, transactions will not wait if a lock request cannot be
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immediately granted, instead <a href="DeadlockException.html" title="class in com.sleepycat.db"><code>DeadlockException</code></a> will be thrown.</dd>
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request cannot be immediately granted.
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>If the transaction is configured to not wait if a lock request
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cannot be immediately granted.</dd>
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<div class="block">This transaction will execute with snapshot isolation. For databases
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configured with <a href="DatabaseConfig.html#setMultiversion-boolean-"><code>DatabaseConfig.setMultiversion(boolean)</code></a>, data values
|
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will be read as they are when the transaction begins, without taking
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read locks.
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<p>
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Updates operations performed in the transaction will cause a
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<a href="DeadlockException.html" title="class in com.sleepycat.db"><code>DeadlockException</code></a> to be thrown if data is modified
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between reading and writing it.</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>snapshot</code> - if this transaction will execute with snapshot isolation</dd>
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<pre class="methodSignature">public boolean getSnapshot()</pre>
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<div class="block">Return true if the transaction is configured for Snapshot Isolation.
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<p>
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This method may be called at any time during the life of the application.
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<p></div>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>True if the transaction is configured for Snapshot Isolation.</dd>
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<pre class="methodSignature">public void setSync​(boolean sync)</pre>
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<div class="block">Configure the transaction to write and synchronously flush the log
|
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it when commits.
|
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<p>
|
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This behavior may be set for a database environment using the
|
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Environment.setMutableConfig method. Any value specified to this
|
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method overrides that setting.
|
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<p>
|
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The default is false for this class and true for the database
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environment.
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<p>
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If true is passed to both setSync and setNoSync, setSync will take
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precedence.
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<p></div>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>sync</code> - If true, transactions exhibit all the ACID (atomicity, consistency,
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isolation, and durability) properties.</dd>
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|
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flush the log it when commits.
|
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<p></div>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>If the transaction is configured to write and synchronously flush
|
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the log it when commits.</dd>
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<div class="block">Configure the transaction to wait if a lock request cannot be
|
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immediately granted.
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<p>
|
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The default is true unless <a href="EnvironmentConfig.html#setTxnNoWait-boolean-"><code>EnvironmentConfig.setTxnNoWait(boolean)</code></a> is called.
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<p></div>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>wait</code> - If true, transactions will wait if a lock request cannot be
|
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immediately granted, instead <a href="DeadlockException.html" title="class in com.sleepycat.db"><code>DeadlockException</code></a> will be thrown.</dd>
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<div class="block">Return if the transaction is configured to wait if a lock
|
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request cannot be immediately granted.
|
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<p></div>
|
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<dl>
|
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<dt><span class="returnLabel">Returns:</span></dt>
|
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<dd>If the transaction is configured to wait if a lock request
|
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cannot be immediately granted.</dd>
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</dl>
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<pre class="methodSignature">public void setWriteNoSync​(boolean writeNoSync)</pre>
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<div class="block">Configure the transaction to write but not synchronously flush the log
|
|
it when commits.
|
|
<p>
|
|
This behavior may be set for a database environment using the
|
|
Environment.setMutableConfig method. Any value specified to this method
|
|
overrides that setting.
|
|
<p>
|
|
The default is false for this class and the database environment.
|
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<p></div>
|
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<dl>
|
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<dt><span class="paramLabel">Parameters:</span></dt>
|
|
<dd><code>writeNoSync</code> - If true, transactions exhibit the ACI (atomicity, consistency, and
|
|
isolation) properties, but not D (durability); that is, database
|
|
integrity will be maintained, but if the operating system
|
|
fails, it is possible some number of the most recently committed
|
|
transactions may be undone during recovery. The number of
|
|
transactions at risk is governed by how often the operating system
|
|
flushes dirty buffers to disk, and how often the log is
|
|
checkpointed.</dd>
|
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</dl>
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</li>
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<pre class="methodSignature">public boolean getWriteNoSync()</pre>
|
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<div class="block">Return if the transaction is configured to write but not synchronously
|
|
flush the log it when commits.
|
|
<p></div>
|
|
<dl>
|
|
<dt><span class="returnLabel">Returns:</span></dt>
|
|
<dd>If the transaction is configured to not write or synchronously flush
|
|
the log it when commits.</dd>
|
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</dl>
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</li>
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</ul>
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<h4>setBulk</h4>
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<pre class="methodSignature">public void setBulk​(boolean bulk)</pre>
|
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<div class="block">Configures the transaction to enable the transactional bulk insert
|
|
optimization. When this attribute is set, the transaction will avoid
|
|
logging the contents of insertions on newly allocated database pages.
|
|
In a transaction that inserts a large number of new records, the I/O
|
|
savings of choosing this option can be significant. Users of this
|
|
option should be aware of several issues. When the optimization is in
|
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effect, page allocations that extend the database file are logged as
|
|
usual; this allows transaction aborts to work correctly, both online
|
|
and during recovery. At commit time, the database's pages are flushed
|
|
to disk, eliminating the need to roll-forward the transaction during
|
|
normal recovery. However, there are other recovery operations that
|
|
depend on roll-forward, and care must be taken when Bulk-enabled
|
|
transactions interact with them. In particular, Bulk is
|
|
incompatible with replication, and is simply ignored when replication
|
|
is enabled. Also, hot backup procedures must follow a particular
|
|
protocol, introduced in 11gr2.5.1, to set a flag in the environment
|
|
before starting to copy files. It is especially important to note
|
|
that incremental hot backups can be invalidated by use of the bulk
|
|
insert optimization. Please see the hot backup description in the
|
|
<i>Getting Started with Transactions Guide</i>, and the description of the
|
|
HotbackupInProgress attribute in
|
|
<a href="EnvironmentConfig.html" title="class in com.sleepycat.db"><code>EnvironmentConfig</code></a>
|
|
for further information.
|
|
<p>
|
|
The bulk insert optimization is effective only for
|
|
top-level transactions.
|
|
<p></div>
|
|
<dl>
|
|
<dt><span class="paramLabel">Parameters:</span></dt>
|
|
<dd><code>bulk</code> - If true, configure the transaction to enable the bulk optimization.</dd>
|
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</dl>
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</li>
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</ul>
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<a name="getBulk--">
|
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<!-- -->
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</a>
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<ul class="blockListLast">
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<li class="blockList">
|
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<h4>getBulk</h4>
|
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<pre class="methodSignature">public boolean getBulk()</pre>
|
|
<div class="block">Return true if the Bulk attribute is set.
|
|
<p></div>
|
|
<dl>
|
|
<dt><span class="returnLabel">Returns:</span></dt>
|
|
<dd>The current setting of the Bulk attribute.</dd>
|
|
</dl>
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</li>
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