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TransactionConfig (Sleepycat Software, Inc. - Berkeley DB Java API)
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com.sleepycat.db</FONT>
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Class TransactionConfig</H2>
<PRE>
<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html" title="class or interface in java.lang">java.lang.Object</A>
<IMG SRC="../../../resources/inherit.gif" ALT="extended by"><B>com.sleepycat.db.TransactionConfig</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Cloneable.html" title="class or interface in java.lang">Cloneable</A></DD>
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<DL>
<DT>public class <B>TransactionConfig</B><DT>extends <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A><DT>implements <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Cloneable.html" title="class or interface in java.lang">Cloneable</A></DL>
<P>
Specifies the attributes of a database environment transaction.
<P>
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<CODE>static <A HREF="../../../com/sleepycat/db/TransactionConfig.html" title="class in com.sleepycat.db">TransactionConfig</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/TransactionConfig.html#DEFAULT">DEFAULT</A></B></CODE>
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<TD><CODE><B><A HREF="../../../com/sleepycat/db/TransactionConfig.html#TransactionConfig()">TransactionConfig</A></B>()</CODE>
<BR>
An instance created using the default constructor is initialized
with the system's default settings.</TD>
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<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/TransactionConfig.html#getDegree2()">getDegree2</A></B>()</CODE>
<BR>
Return if the transaction has been configured to have degree 2 isolation.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/TransactionConfig.html#getDirtyRead()">getDirtyRead</A></B>()</CODE>
<BR>
Return if the transaction is configured to perform dirty reads.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/TransactionConfig.html#getNoSync()">getNoSync</A></B>()</CODE>
<BR>
Return if the transaction is configured to not write or synchronously
flush the log it when commits.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/TransactionConfig.html#getNoWait()">getNoWait</A></B>()</CODE>
<BR>
Return if the transaction is configured to not wait if a lock
request cannot be immediately granted.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/TransactionConfig.html#getSync()">getSync</A></B>()</CODE>
<BR>
Return if the transaction is configured to not write or synchronously
flush the log it when commits.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/TransactionConfig.html#getWriteNoSync()">getWriteNoSync</A></B>()</CODE>
<BR>
Return if the transaction is configured to write but not synchronously
flush the log it when commits.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/TransactionConfig.html#setDegree2(boolean)">setDegree2</A></B>(boolean degree2)</CODE>
<BR>
Configure this transaction to have degree 2 isolation.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/TransactionConfig.html#setDirtyRead(boolean)">setDirtyRead</A></B>(boolean dirtyRead)</CODE>
<BR>
Configure the transaction to perform dirty reads.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/TransactionConfig.html#setNoSync(boolean)">setNoSync</A></B>(boolean txnNoSync)</CODE>
<BR>
Configure the transaction to not write or synchronously flush the log
it when commits.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/TransactionConfig.html#setNoWait(boolean)">setNoWait</A></B>(boolean noWait)</CODE>
<BR>
Configure the transaction to not wait if a lock request cannot be
immediately granted.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/TransactionConfig.html#setSync(boolean)">setSync</A></B>(boolean txnSync)</CODE>
<BR>
Configure the transaction to write or synchronously flush the log
it when commits.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/TransactionConfig.html#setWriteNoSync(boolean)">setWriteNoSync</A></B>(boolean txnWriteNoSync)</CODE>
<BR>
Configure the transaction to write but not synchronously flush the log
it when commits.</TD>
</TR>
</TABLE>
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<A NAME="DEFAULT"><!-- --></A><H3>
DEFAULT</H3>
<PRE>
public static final <A HREF="../../../com/sleepycat/db/TransactionConfig.html" title="class in com.sleepycat.db">TransactionConfig</A> <B>DEFAULT</B></PRE>
<DL>
<DL>
</DL>
</DL>
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<A NAME="TransactionConfig()"><!-- --></A><H3>
TransactionConfig</H3>
<PRE>
public <B>TransactionConfig</B>()</PRE>
<DL>
<DD>An instance created using the default constructor is initialized
with the system's default settings.
<P>
</DL>
<!-- ============ METHOD DETAIL ========== -->
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<A NAME="setDegree2(boolean)"><!-- --></A><H3>
setDegree2</H3>
<PRE>
public void <B>setDegree2</B>(boolean degree2)</PRE>
<DL>
<DD>Configure this transaction to have degree 2 isolation. This provides
for cursor stability but not repeatable reads. Data items which have
been previously read by this transaction may be deleted or modified by
other transactions before this transaction completes.
<p>
The default is false for this class and the database environment.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="getDegree2()"><!-- --></A><H3>
getDegree2</H3>
<PRE>
public boolean <B>getDegree2</B>()</PRE>
<DL>
<DD>Return if the transaction has been configured to have degree 2 isolation.
<p>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>If the transaction has been configured to have degree 2 isolation.</DL>
</DD>
</DL>
<HR>
<A NAME="setSync(boolean)"><!-- --></A><H3>
setSync</H3>
<PRE>
public void <B>setSync</B>(boolean txnSync)</PRE>
<DL>
<DD>Configure the transaction to 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 true for the database
environment.
<p>
If true is passed to both setSync and setNoSync, setSync will take
precedence.
<p>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>txnSync</CODE> - If true, transactions exhibit all the ACID (atomicity, consistency,
isolation, and durability) properties.</DL>
</DD>
</DL>
<HR>
<A NAME="getSync()"><!-- --></A><H3>
getSync</H3>
<PRE>
public boolean <B>getSync</B>()</PRE>
<DL>
<DD>Return if the transaction is configured to not write or synchronously
flush the log it when commits.
<p>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>If the transaction is configured to not write or synchronously flush
the log it when commits.</DL>
</DD>
</DL>
<HR>
<A NAME="setWriteNoSync(boolean)"><!-- --></A><H3>
setWriteNoSync</H3>
<PRE>
public void <B>setWriteNoSync</B>(boolean txnWriteNoSync)</PRE>
<DL>
<DD>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>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>txnWriteNoSync</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.</DL>
</DD>
</DL>
<HR>
<A NAME="getWriteNoSync()"><!-- --></A><H3>
getWriteNoSync</H3>
<PRE>
public boolean <B>getWriteNoSync</B>()</PRE>
<DL>
<DD>Return if the transaction is configured to write but not synchronously
flush the log it when commits.
<p>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>If the transaction is configured to not write or synchronously flush
the log it when commits.</DL>
</DD>
</DL>
<HR>
<A NAME="setNoSync(boolean)"><!-- --></A><H3>
setNoSync</H3>
<PRE>
public void <B>setNoSync</B>(boolean txnNoSync)</PRE>
<DL>
<DD>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>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>txnNoSync</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.</DL>
</DD>
</DL>
<HR>
<A NAME="getNoSync()"><!-- --></A><H3>
getNoSync</H3>
<PRE>
public boolean <B>getNoSync</B>()</PRE>
<DL>
<DD>Return if the transaction is configured to not write or synchronously
flush the log it when commits.
<p>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>If the transaction is configured to not write or synchronously flush
the log it when commits.</DL>
</DD>
</DL>
<HR>
<A NAME="setNoWait(boolean)"><!-- --></A><H3>
setNoWait</H3>
<PRE>
public void <B>setNoWait</B>(boolean noWait)</PRE>
<DL>
<DD>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>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><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.</DL>
</DD>
</DL>
<HR>
<A NAME="getNoWait()"><!-- --></A><H3>
getNoWait</H3>
<PRE>
public boolean <B>getNoWait</B>()</PRE>
<DL>
<DD>Return if the transaction is configured to not wait if a lock
request cannot be immediately granted.
<p>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>If the transaction is configured to not wait if a lock request
cannot be immediately granted.</DL>
</DD>
</DL>
<HR>
<A NAME="setDirtyRead(boolean)"><!-- --></A><H3>
setDirtyRead</H3>
<PRE>
public void <B>setDirtyRead</B>(boolean dirtyRead)</PRE>
<DL>
<DD>Configure the transaction to perform dirty reads.
<p>
The default is false for this class and the database environment.
<p>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>dirtyRead</CODE> - If true, all read operations performed by the transaction may read
modified but not yet committed data.</DL>
</DD>
</DL>
<HR>
<A NAME="getDirtyRead()"><!-- --></A><H3>
getDirtyRead</H3>
<PRE>
public boolean <B>getDirtyRead</B>()</PRE>
<DL>
<DD>Return if the transaction is configured to perform dirty reads.
<p>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>If the transaction is configured to perform dirty reads.</DL>
</DD>
</DL>
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