File: env_set_lk_detect.html

package info (click to toggle)
evolution-data-server 1.0.4-1
  • links: PTS
  • area: main
  • in suites: sarge
  • size: 39,504 kB
  • ctags: 26,423
  • sloc: ansic: 175,347; tcl: 30,499; sh: 20,699; perl: 11,320; xml: 9,039; java: 7,653; cpp: 6,029; makefile: 4,866; awk: 1,338; yacc: 1,103; sed: 772; cs: 505; lex: 134; asm: 14
file content (88 lines) | stat: -rw-r--r-- 4,895 bytes parent folder | download | duplicates (3)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
<!--$Id: env_set_lk_detect.html,v 1.1.1.1 2003/11/20 22:14:34 toshok Exp $-->
<!--Copyright 1997-2002 by Sleepycat Software, Inc.-->
<!--All rights reserved.-->
<!--See the file LICENSE for redistribution information.-->
<html>
<head>
<title>Berkeley DB: DbEnv.set_lk_detect</title>
<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++">
</head>
<body bgcolor=white>
<a name="2"><!--meow--></a>
<table width="100%"><tr valign=top>
<td>
<h1>DbEnv.set_lk_detect</h1>
</td>
<td align=right>
<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>
</td></tr></table>
<hr size=1 noshade>
<tt>
<h3><pre>
import com.sleepycat.db.*;
<p>
public void set_lk_detect(int detect)
    throws DbException;
</pre></h3>
<h1>Description</h1>
<p>Set if the deadlock detector is to be run whenever a lock conflict
occurs, and specify what lock request(s) should be rejected.  As
transactions acquire locks on behalf of a single locker ID, rejecting
a lock request associated with a transaction normally requires the
transaction be aborted.  The specified value must be one of the
following list:
<p><dl compact>
<p><dt><a name="Db.DB_LOCK_DEFAULT">Db.DB_LOCK_DEFAULT</a><dd>Use whatever lock policy was specified when the database environment
was created.  If no lock policy has yet been specified, set the lock
policy to Db.DB_LOCK_RANDOM.
<dt><a name="Db.DB_LOCK_EXPIRE">Db.DB_LOCK_EXPIRE</a><dd>Reject lock requests which have timed out.  No other deadlock detection
is performed.
<dt><a name="Db.DB_LOCK_MAXLOCKS">Db.DB_LOCK_MAXLOCKS</a><dd>Reject the lock request for the locker ID with the greatest number of
locks.
<dt><a name="Db.DB_LOCK_MINLOCKS">Db.DB_LOCK_MINLOCKS</a><dd>Reject the lock request for the locker ID with the fewest number of
locks.
<dt><a name="Db.DB_LOCK_MINWRITE">Db.DB_LOCK_MINWRITE</a><dd>Reject the lock request for the locker ID with the fewest number of
write locks.
<dt><a name="Db.DB_LOCK_OLDEST">Db.DB_LOCK_OLDEST</a><dd>Reject the lock request for the oldest locker ID.
<dt><a name="Db.DB_LOCK_RANDOM">Db.DB_LOCK_RANDOM</a><dd>Reject the lock request for a random locker ID.
<dt><a name="Db.DB_LOCK_YOUNGEST">Db.DB_LOCK_YOUNGEST</a><dd>Reject the lock request for the youngest locker ID.
</dl>
<p>The DbEnv.set_lk_detect method configures a database environment, not only operations
performed using the specified <a href="../api_java/env_class.html">DbEnv</a> handle.
<p>The DbEnv.set_lk_detect interface may not be called after the <a href="../api_java/env_open.html">DbEnv.open</a>
interface is called.
If the database environment already exists when
<a href="../api_java/env_open.html">DbEnv.open</a> is called, the information specified to DbEnv.set_lk_detect
must be consistent with the existing environment or an error will be
returned.
<p>The DbEnv.set_lk_detect method throws an exception that encapsulates a non-zero error value on
failure.
<p>The database environment's deadlock detector configuration may also be set using the environment's
<b>DB_CONFIG</b> file.  The syntax of the entry in that file is a
single line with the string "set_lk_detect", one or more whitespace characters,
and the interface <b>detect</b> argument as a string; for example,
"set_lk_detect DB_LOCK_OLDEST".  Because the <b>DB_CONFIG</b> file is read when the database
environment is opened, it will silently overrule configuration done
before that time.
<h1>Errors</h1>
<p>The DbEnv.set_lk_detect method may fail and throw an exception encapsulating a non-zero error for the following conditions:
<p><dl compact>
<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
<p>Called after <a href="../api_java/env_open.html">DbEnv.open</a> was called.
</dl>
<p>The DbEnv.set_lk_detect method may fail and throw an exception for errors specified for other Berkeley DB and C library or system methods.
If a catastrophic error has occurred, the DbEnv.set_lk_detect method may fail and
throw a <a href="../api_java/runrec_class.html">DbRunRecoveryException</a>,
in which case all subsequent Berkeley DB calls will fail in the same way.
<h1>Class</h1>
<a href="../api_java/env_class.html">DbEnv</a>, <a href="../api_java/lock_class.html">DbLock</a>
<h1>See Also</h1>
<a href="../api_java/lock_list.html">Locking Subsystem and Related Methods</a>
</tt>
<table width="100%"><tr><td><br></td><td align=right>
<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>
</td></tr></table>
<p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font>
</body>
</html>