2
<!--Copyright 1997-2002 by Sleepycat Software, Inc.-->
3
<!--All rights reserved.-->
4
<!--See the file LICENSE for redistribution information.-->
7
<title>Berkeley DB: DbEnv.set_lk_max_lockers</title>
8
<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
9
<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++">
12
<a name="2"><!--meow--></a>
13
<table width="100%"><tr valign=top>
15
<h1>DbEnv.set_lk_max_lockers</h1>
18
<a href="../api_java/c_index.html"><img src="../images/api.gif" alt="API"></a><a href="../reftoc.html"><img src="../images/ref.gif" alt="Ref"></a>
23
import com.sleepycat.db.*;
25
public void set_lk_max_lockers(int max)
29
<p>Set the maximum number of simultaneous locking entities supported by
30
the Berkeley DB lock subsystem. This value is used by <a href="../api_java/env_open.html">DbEnv.open</a> to
31
estimate how much space to allocate for various lock-table data
32
structures. The default value is 1000 lockers. For specific
33
information on configuring the size of the lock subsystem, see
34
<a href="../ref/lock/max.html">Configuring locking: sizing the
36
<p>The DbEnv.set_lk_max_lockers method configures a database environment, not only operations
37
performed using the specified <a href="../api_java/env_class.html">DbEnv</a> handle.
38
<p>The DbEnv.set_lk_max_lockers interface may not be called after the <a href="../api_java/env_open.html">DbEnv.open</a>
40
If the database environment already exists when
41
<a href="../api_java/env_open.html">DbEnv.open</a> is called, the information specified to DbEnv.set_lk_max_lockers
43
<p>The DbEnv.set_lk_max_lockers method throws an exception that encapsulates a non-zero error value on
45
<p>The database environment's maximum number of lockers may also be set using the environment's
46
<b>DB_CONFIG</b> file. The syntax of the entry in that file is a
47
single line with the string "set_lk_max_lockers", one or more whitespace characters,
48
and the number of lockers. Because the <b>DB_CONFIG</b> file is read when the database
49
environment is opened, it will silently overrule configuration done
52
<p>The DbEnv.set_lk_max_lockers method may fail and throw an exception encapsulating a non-zero error for the following conditions:
54
<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
55
<p>Called after <a href="../api_java/env_open.html">DbEnv.open</a> was called.
57
<p>The DbEnv.set_lk_max_lockers method may fail and throw an exception for errors specified for other Berkeley DB and C library or system methods.
58
If a catastrophic error has occurred, the DbEnv.set_lk_max_lockers method may fail and
59
throw a <a href="../api_java/runrec_class.html">DbRunRecoveryException</a>,
60
in which case all subsequent Berkeley DB calls will fail in the same way.
62
<a href="../api_java/env_class.html">DbEnv</a>, <a href="../api_java/lock_class.html">DbLock</a>
64
<a href="../api_java/lock_list.html">Locking Subsystem and Related Methods</a>
66
<table width="100%"><tr><td><br></td><td align=right>
67
<a href="../api_java/c_index.html"><img src="../images/api.gif" alt="API"></a><a href="../reftoc.html"><img src="../images/ref.gif" alt="Ref"></a>
69
<p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font>