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<div class="subTitle">com.sleepycat.db</div>
<h2 title="Class TransactionConfig" class="title">Class TransactionConfig</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li>com.sleepycat.db.TransactionConfig</li>
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<dt>All Implemented Interfaces:</dt>
<dd>java.lang.Cloneable</dd>
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<pre>public class <span class="strong">TransactionConfig</span>
extends java.lang.Object
implements java.lang.Cloneable</pre>
<div class="block">Specifies the attributes of a database environment transaction.</div>
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<caption><span>Fields</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static <a href="../../../com/sleepycat/db/TransactionConfig.html" title="class in com.sleepycat.db">TransactionConfig</a></code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/TransactionConfig.html#DEFAULT">DEFAULT</a></strong></code>
<div class="block">Default configuration used if null is passed to methods that create a
transaction.</div>
</td>
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<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colOne" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../com/sleepycat/db/TransactionConfig.html#TransactionConfig()">TransactionConfig</a></strong>()</code>
<div class="block">An instance created using the default constructor is initialized
with the system's default settings.</div>
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<caption><span>Methods</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/TransactionConfig.html#getBulk()">getBulk</a></strong>()</code>
<div class="block">Return true if the Bulk attribute is set.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/TransactionConfig.html#getDegree2()">getDegree2</a></strong>()</code>
<div class="block"><strong>Deprecated.</strong>
<div class="block"><i>This has been replaced by <a href="../../../com/sleepycat/db/TransactionConfig.html#getReadCommitted()"><code>getReadCommitted()</code></a> to conform to ANSI
database isolation terminology.</i></div>
</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/TransactionConfig.html#getDirtyRead()">getDirtyRead</a></strong>()</code>
<div class="block"><strong>Deprecated.</strong>
<div class="block"><i>This has been replaced by <a href="../../../com/sleepycat/db/TransactionConfig.html#getReadUncommitted()"><code>getReadUncommitted()</code></a> to conform to ANSI
database isolation terminology.</i></div>
</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/TransactionConfig.html#getNoSync()">getNoSync</a></strong>()</code>
<div class="block">Return if the transaction is configured to not write or synchronously
flush the log it when commits.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/TransactionConfig.html#getNoWait()">getNoWait</a></strong>()</code>
<div class="block">Return if the transaction is configured to not wait if a lock
request cannot be immediately granted.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/TransactionConfig.html#getReadCommitted()">getReadCommitted</a></strong>()</code>
<div class="block">Return if the transaction is configured for read committed isolation.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/TransactionConfig.html#getReadUncommitted()">getReadUncommitted</a></strong>()</code>
<div class="block">Return if read operations performed by the transaction are configured to
return modified but not yet committed data.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/TransactionConfig.html#getSnapshot()">getSnapshot</a></strong>()</code>
<div class="block">Return true if the transaction is configured for Snapshot Isolation.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/TransactionConfig.html#getSync()">getSync</a></strong>()</code>
<div class="block">Return if the transaction is configured to write and synchronously
flush the log it when commits.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/TransactionConfig.html#getWait()">getWait</a></strong>()</code>
<div class="block">Return if the transaction is configured to wait if a lock
request cannot be immediately granted.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/TransactionConfig.html#getWriteNoSync()">getWriteNoSync</a></strong>()</code>
<div class="block">Return if the transaction is configured to write but not synchronously
flush the log it when commits.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/TransactionConfig.html#setBulk(boolean)">setBulk</a></strong>(boolean bulk)</code>
<div class="block">Configures the transaction to enable the transactional bulk insert
optimization.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/TransactionConfig.html#setDegree2(boolean)">setDegree2</a></strong>(boolean degree2)</code>
<div class="block"><strong>Deprecated.</strong>
<div class="block"><i>This has been replaced by <a href="../../../com/sleepycat/db/TransactionConfig.html#setReadCommitted(boolean)"><code>setReadCommitted(boolean)</code></a> to conform to ANSI
database isolation terminology.</i></div>
</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/TransactionConfig.html#setDirtyRead(boolean)">setDirtyRead</a></strong>(boolean dirtyRead)</code>
<div class="block"><strong>Deprecated.</strong>
<div class="block"><i>This has been replaced by <a href="../../../com/sleepycat/db/TransactionConfig.html#setReadUncommitted(boolean)"><code>setReadUncommitted(boolean)</code></a> to conform to ANSI
database isolation terminology.</i></div>
</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/TransactionConfig.html#setNoSync(boolean)">setNoSync</a></strong>(boolean noSync)</code>
<div class="block">Configure the transaction to not write or synchronously flush the log
it when commits.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/TransactionConfig.html#setNoWait(boolean)">setNoWait</a></strong>(boolean noWait)</code>
<div class="block">Configure the transaction to not wait if a lock request cannot be
immediately granted.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/TransactionConfig.html#setReadCommitted(boolean)">setReadCommitted</a></strong>(boolean readCommitted)</code>
<div class="block">Configure the transaction for read committed isolation.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/TransactionConfig.html#setReadUncommitted(boolean)">setReadUncommitted</a></strong>(boolean readUncommitted)</code>
<div class="block">Configure read operations performed by the transaction to return modified
but not yet committed data.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/TransactionConfig.html#setSnapshot(boolean)">setSnapshot</a></strong>(boolean snapshot)</code>
<div class="block">This transaction will execute with snapshot isolation.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/TransactionConfig.html#setSync(boolean)">setSync</a></strong>(boolean sync)</code>
<div class="block">Configure the transaction to write and synchronously flush the log
it when commits.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/TransactionConfig.html#setWait(boolean)">setWait</a></strong>(boolean wait)</code>
<div class="block">Configure the transaction to wait if a lock request cannot be
immediately granted.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/TransactionConfig.html#setWriteNoSync(boolean)">setWriteNoSync</a></strong>(boolean writeNoSync)</code>
<div class="block">Configure the transaction to write but not synchronously flush the log
it when commits.</div>
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<h3>Methods inherited from class java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
</ul>
</li>
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<h3>Field Detail</h3>
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<h4>DEFAULT</h4>
<pre>public static final <a href="../../../com/sleepycat/db/TransactionConfig.html" title="class in com.sleepycat.db">TransactionConfig</a> DEFAULT</pre>
<div class="block">Default configuration used if null is passed to methods that create a
transaction.</div>
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<h3>Constructor Detail</h3>
<a name="TransactionConfig()">
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<h4>TransactionConfig</h4>
<pre>public TransactionConfig()</pre>
<div class="block">An instance created using the default constructor is initialized
with the system's default settings.</div>
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<h4>setReadCommitted</h4>
<pre>public void setReadCommitted(boolean readCommitted)</pre>
<div class="block">Configure the transaction for read committed isolation.
<p>
This ensures the stability of the current data item read by the
cursor but permits data read by this transaction to be modified or
deleted prior to the commit of the transaction.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>readCommitted</code> - If true, configure the transaction for read committed isolation.</dd></dl>
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<pre>public boolean getReadCommitted()</pre>
<div class="block">Return if the transaction is configured for read committed isolation.
<p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>If the transaction is configured for read committed isolation.</dd></dl>
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<h4>setDegree2</h4>
<pre>public void setDegree2(boolean degree2)</pre>
<div class="block"><span class="strong">Deprecated.</span> <i>This has been replaced by <a href="../../../com/sleepycat/db/TransactionConfig.html#setReadCommitted(boolean)"><code>setReadCommitted(boolean)</code></a> to conform to ANSI
database isolation terminology.</i></div>
<div class="block">Configure the transaction for read committed isolation.
<p>
This ensures the stability of the current data item read by the
cursor but permits data read by this transaction to be modified or
deleted prior to the commit of the transaction.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>degree2</code> - If true, configure the transaction for read committed isolation.
<p></dd></dl>
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<h4>getDegree2</h4>
<pre>public boolean getDegree2()</pre>
<div class="block"><span class="strong">Deprecated.</span> <i>This has been replaced by <a href="../../../com/sleepycat/db/TransactionConfig.html#getReadCommitted()"><code>getReadCommitted()</code></a> to conform to ANSI
database isolation terminology.</i></div>
<div class="block">Return if the transaction is configured for read committed isolation.
<p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>If the transaction is configured for read committed isolation.
<p></dd></dl>
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<pre>public void setReadUncommitted(boolean readUncommitted)</pre>
<div class="block">Configure read operations performed by the transaction to return modified
but not yet committed data.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>readUncommitted</code> - If true, configure read operations performed by the transaction to return
modified but not yet committed data.</dd></dl>
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<pre>public boolean getReadUncommitted()</pre>
<div class="block">Return if read operations performed by the transaction are configured to
return modified but not yet committed data.
<p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>If read operations performed by the transaction are configured to return
modified but not yet committed data.</dd></dl>
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<pre>public void setDirtyRead(boolean dirtyRead)</pre>
<div class="block"><span class="strong">Deprecated.</span> <i>This has been replaced by <a href="../../../com/sleepycat/db/TransactionConfig.html#setReadUncommitted(boolean)"><code>setReadUncommitted(boolean)</code></a> to conform to ANSI
database isolation terminology.</i></div>
<div class="block">Configure read operations performed by the transaction to return modified
but not yet committed data.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>dirtyRead</code> - If true, configure read operations performed by the transaction to return
modified but not yet committed data.
<p></dd></dl>
</li>
</ul>
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<h4>getDirtyRead</h4>
<pre>public boolean getDirtyRead()</pre>
<div class="block"><span class="strong">Deprecated.</span> <i>This has been replaced by <a href="../../../com/sleepycat/db/TransactionConfig.html#getReadUncommitted()"><code>getReadUncommitted()</code></a> to conform to ANSI
database isolation terminology.</i></div>
<div class="block">Return if read operations performed by the transaction are configured to
return modified but not yet committed data.
<p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>If read operations performed by the transaction are configured to return
modified but not yet committed data.
<p></dd></dl>
</li>
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<h4>setNoSync</h4>
<pre>public void setNoSync(boolean noSync)</pre>
<div class="block">Configure the transaction to not write or 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.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>noSync</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 application or 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 many log updates can fit
into the log buffer, how often the operating system flushes dirty
buffers to disk, and how often the log is checkpointed.</dd></dl>
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<h4>getNoSync</h4>
<pre>public boolean getNoSync()</pre>
<div class="block">Return if the transaction is configured to not write or synchronously
flush the log it when commits.
<p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>If the transaction is configured to not write or synchronously flush
the log it when commits.</dd></dl>
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<h4>setNoWait</h4>
<pre>public void setNoWait(boolean noWait)</pre>
<div class="block">Configure the transaction to not wait if a lock request cannot be
immediately granted.
<p>
The default is false for this class and the database environment.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>noWait</code> - If true, transactions will not wait if a lock request cannot be
immediately granted, instead <a href="../../../com/sleepycat/db/DeadlockException.html" title="class in com.sleepycat.db"><code>DeadlockException</code></a> will be thrown.</dd></dl>
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<h4>getNoWait</h4>
<pre>public boolean getNoWait()</pre>
<div class="block">Return if the transaction is configured to not wait if a lock
request cannot be immediately granted.
<p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>If the transaction is configured to not wait if a lock request
cannot be immediately granted.</dd></dl>
</li>
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<h4>setSnapshot</h4>
<pre>public void setSnapshot(boolean snapshot)</pre>
<div class="block">This transaction will execute with snapshot isolation. For databases
configured with <a href="../../../com/sleepycat/db/DatabaseConfig.html#setMultiversion(boolean)"><code>DatabaseConfig.setMultiversion(boolean)</code></a>, data values
will be read as they are when the transaction begins, without taking
read locks.
<p>
Updates operations performed in the transaction will cause a
<a href="../../../com/sleepycat/db/DeadlockException.html" title="class in com.sleepycat.db"><code>DeadlockException</code></a> to be thrown if data is modified
between reading and writing it.</div>
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<h4>getSnapshot</h4>
<pre>public boolean getSnapshot()</pre>
<div class="block">Return true if the transaction is configured for Snapshot Isolation.
<p>
This method may be called at any time during the life of the application.
<p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>True if the transaction is configured for Snapshot Isolation.</dd></dl>
</li>
</ul>
<a name="setSync(boolean)">
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<h4>setSync</h4>
<pre>public void setSync(boolean sync)</pre>
<div class="block">Configure the transaction to write and 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 true for the database
environment.
<p>
If true is passed to both setSync and setNoSync, setSync will take
precedence.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>sync</code> - If true, transactions exhibit all the ACID (atomicity, consistency,
isolation, and durability) properties.</dd></dl>
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<h4>getSync</h4>
<pre>public boolean getSync()</pre>
<div class="block">Return if the transaction is configured to write and synchronously
flush the log it when commits.
<p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>If the transaction is configured to write and synchronously flush
the log it when commits.</dd></dl>
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<h4>setWait</h4>
<pre>public void setWait(boolean wait)</pre>
<div class="block">Configure the transaction to wait if a lock request cannot be
immediately granted.
<p>
The default is true unless <a href="../../../com/sleepycat/db/EnvironmentConfig.html#setTxnNoWait(boolean)"><code>EnvironmentConfig.setTxnNoWait(boolean)</code></a> is called.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>wait</code> - If true, transactions will wait if a lock request cannot be
immediately granted, instead <a href="../../../com/sleepycat/db/DeadlockException.html" title="class in com.sleepycat.db"><code>DeadlockException</code></a> will be thrown.</dd></dl>
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<pre>public boolean getWait()</pre>
<div class="block">Return if the transaction is configured to wait if a lock
request cannot be immediately granted.
<p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>If the transaction is configured to wait if a lock request
cannot be immediately granted.</dd></dl>
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<pre>public void setWriteNoSync(boolean writeNoSync)</pre>
<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.
<p></div>
<dl><dt><span class="strong">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></dl>
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<pre>public boolean getWriteNoSync()</pre>
<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="strong">Returns:</span></dt><dd>If the transaction is configured to not write or synchronously flush
the log it when commits.</dd></dl>
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<h4>setBulk</h4>
<pre>public void setBulk(boolean bulk)</pre>
<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
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="../../../com/sleepycat/db/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="strong">Parameters:</span></dt><dd><code>bulk</code> - If true, configure the transaction to enable the bulk optimization.</dd></dl>
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<pre>public boolean getBulk()</pre>
<div class="block">Return true if the Bulk attribute is set.
<p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>The current setting of the Bulk attribute.</dd></dl>
</li>
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