File: db_set_cache_priority.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 (65 lines) | stat: -rw-r--r-- 3,344 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
<!--$Id: db_set_cache_priority.html,v 1.1.1.1 2003/11/20 22:14:31 toshok Exp $-->
<!--Copyright 1997-2002 by Sleepycat Software, Inc.-->
<!--All rights reserved.-->
<!--See the file LICENSE for redistribution information.-->
<html>
<head>
<title>Berkeley DB: Db.set_cache_priority</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>Db.set_cache_priority</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_cache_priority(int priority)
    throws DbException;
</pre></h3>
<h1>Description</h1>
<p>Set the cache priority for pages from the specified database.  The
priority of a page biases the replacement algorithm to be more or less
likely to discard a page when space is needed in the buffer pool.  The
bias is temporary, and pages will eventually be discarded if they are
not referenced again.  The Db.set_cache_priority interface is
only advisory, and does not guarantee pages will be treated in a specific
way.
<p>The <b>priority</b> argument must be set to one of the following values:
<p><dl compact>
<p><dt><a name="Db.DB_PRIORITY_VERY_LOW">Db.DB_PRIORITY_VERY_LOW</a><dd>The lowest priority: pages are the most likely to be discarded.
<dt><a name="Db.DB_PRIORITY_LOW">Db.DB_PRIORITY_LOW</a><dd>The next lowest priority.
<dt><a name="Db.DB_PRIORITY_DEFAULT">Db.DB_PRIORITY_DEFAULT</a><dd>The default priority.
<dt><a name="Db.DB_PRIORITY_HIGH">Db.DB_PRIORITY_HIGH</a><dd>The next highest priority.
<dt><a name="Db.DB_PRIORITY_VERY_HIGH">Db.DB_PRIORITY_VERY_HIGH</a><dd>The highest priority: pages are the least likely to be discarded.
</dl>
<p>The Db.set_cache_priority method configures a database, not only operations performed
using the specified <a href="../api_java/db_class.html">Db</a> handle.
<p>The Db.set_cache_priority interface may be called at any time during the life of
the application.
<p>The Db.set_cache_priority method throws an exception that encapsulates a non-zero error value on
failure.
<h1>Errors</h1>
<p>The Db.set_cache_priority 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 Db.set_cache_priority 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/db_class.html">Db</a>
<h1>See Also</h1>
<a href="../api_java/db_list.html">Databases 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>