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84 lines
4.2 KiB
HTML
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<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
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<html>
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<title>Berkeley DB: DbEnv.set_flags</title>
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<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
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<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++">
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<a name="2"><!--meow--></a>
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<table><tr valign=top>
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<td>
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<h1>DbEnv.set_flags</h1>
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</td>
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<td width="1%">
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<a href="../api_java/java_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
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</td></tr></table>
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<hr size=1 noshade>
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<tt>
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<h3><pre>
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import com.sleepycat.db.*;
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<p>
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public void set_flags(int flags, int onoff)
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throws DbException;
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</pre></h3>
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<h1>Description</h1>
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<p>The <b>flags</b> value must be set to 0 or by bitwise inclusively <b>OR</b>'ing together one or more
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of the following values.
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If <b>onoff</b> is zero, the specified flags are cleared, otherwise they
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are set.
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<p><dl compact>
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<p><dt><a name="Db.DB_CDB_ALLDB">Db.DB_CDB_ALLDB</a><dd>For Berkeley DB Concurrent Data Store applications, perform locking on an environment-wide basis
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rather than per-database. This flag may only be used to configure Berkeley DB
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before the <a href="../api_java/env_open.html">DbEnv.open</a> interface is called.
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<p><dt><a name="Db.DB_NOMMAP">Db.DB_NOMMAP</a><dd>Copy read-only database files in this environment into the local cache
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instead of potentially mapping them into process memory (see the
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description of the <a href="../api_java/env_set_mp_mmapsize.html">DbEnv.set_mp_mmapsize</a> method for further information).
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<p><dt><a name="Db.DB_TXN_NOSYNC">Db.DB_TXN_NOSYNC</a><dd>Do not synchronously flush the log on transaction commit or prepare.
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This means that transactions exhibit the ACI (atomicity, consistency and
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isolation) properties, but not D (durability), i.e., database integrity
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will be maintained but it is possible that some number of the most
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recently committed transactions may be undone during recovery instead of
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being redone.
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<p>The number of transactions that are potentially at risk is governed by
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how often the log is checkpointed (see <a href="../utility/db_checkpoint.html">db_checkpoint</a> for more
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information) and how many log updates can fit on a single log page.
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</dl>
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<p>The DbEnv.set_flags method throws an exception that encapsulates a non-zero error value on
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failure.
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<p>The database environment's flag values may also be set using the environment's
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<b>DB_CONFIG</b> file. The syntax of the entry in that file is a
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single line with the string "set_flags", one or more whitespace characters,
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and the interface flag argument as a string, for example, "set_flags
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DB_TXN_NOSYNC". Because the <b>DB_CONFIG</b> file is read when the database
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environment is opened, it will silently overrule configuration done
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before that time.
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<h1>Errors</h1>
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<p><dl compact>
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<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
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</dl>
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<h3>Class</h3>
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<a href="../api_java/dbenv_class.html">DbEnv</a>
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<h1>See Also</h1>
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<a href="../api_java/env_close.html">DbEnv.close</a>,
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<a href="../api_java/env_open.html">DbEnv.open</a>,
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<a href="../api_java/env_remove.html">DbEnv.remove</a>,
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<a href="../api_java/env_strerror.html">DbEnv.strerror</a>,
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<a href="../api_java/env_version.html">DbEnv.get_version_string</a>
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<a href="../api_java/env_set_cachesize.html">DbEnv.set_cachesize</a>,
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<a href="../api_java/env_set_errcall.html">DbEnv.set_errcall</a>,
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<a href="../api_java/env_set_error_stream.html">DbEnv.set_error_stream</a>,
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<a href="../api_java/env_set_errpfx.html">DbEnv.set_errpfx</a>,
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<a href="../api_java/env_set_flags.html">DbEnv.set_flags</a>,
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<a href="../api_java/env_set_mutexlocks.html">DbEnv.set_mutexlocks</a>,
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and
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<a href="../api_java/env_set_verbose.html">DbEnv.set_verbose</a>.
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</tt>
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