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libdb4.3-devel-4.3.21-1mdk.i586.rpm

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LockMode (Sleepycat Software, Inc. - Berkeley DB Java API)
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<b>Berkeley DB</b><br><font size="-1"> version 4.3.21</font></EM>
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com.sleepycat.db</FONT>
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Class LockMode</H2>
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<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.LockMode</B>
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<DT>public final class <B>LockMode</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></DL>

<P>
Locking modes for database operations. Locking modes are required
parameters for operations that retrieve data or modify the database.
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<CODE>static&nbsp;<A HREF="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/LockMode.html#DEFAULT">DEFAULT</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Acquire read locks for read operations and write locks for write
    operations.</TD>
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<CODE>static&nbsp;<A HREF="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/LockMode.html#DEGREE_2">DEGREE_2</A></B></CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Degree 2 isolation provides for cursor stability but not repeatable
    reads.</TD>
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<CODE>static&nbsp;<A HREF="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/LockMode.html#DIRTY_READ">DIRTY_READ</A></B></CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Read modified but not yet committed data.</TD>
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<CODE>static&nbsp;<A HREF="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/LockMode.html#RMW">RMW</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Acquire write locks instead of read locks when doing the retrieval.</TD>
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<A NAME="DEFAULT"><!-- --></A><H3>
DEFAULT</H3>
<PRE>
public static final <A HREF="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A> <B>DEFAULT</B></PRE>
<DL>
<DD>Acquire read locks for read operations and write locks for write
    operations.
<P>
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</DL>
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<A NAME="DIRTY_READ"><!-- --></A><H3>
DIRTY_READ</H3>
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public static final <A HREF="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A> <B>DIRTY_READ</B></PRE>
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<DD>Read modified but not yet committed data.
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RMW</H3>
<PRE>
public static final <A HREF="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A> <B>RMW</B></PRE>
<DL>
<DD>Acquire write locks instead of read locks when doing the retrieval.
    Setting this flag can eliminate deadlock during a read-modify-write
    cycle by acquiring the write lock during the read part of the cycle
    so that another thread of control acquiring a read lock for the same
    item, in its own read-modify-write cycle, will not result in deadlock.
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DEGREE_2</H3>
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public static final <A HREF="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A> <B>DEGREE_2</B></PRE>
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<DD>Degree 2 isolation provides for cursor stability but not repeatable
    reads.  Data items which have been previously read by this cursor or
    transaction may be deleted or modified by other transactions
    before the cursor is closed or the transaction completes.
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<b>Berkeley DB</b><br><font size="-1"> version 4.3.21</font></EM>
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