ag/cpython-source-deps
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Import BSDDB 4.7.25 (as of svn r89086)

Browse Source
This commit is contained in:
Zachary Ware
2017-09-04 13:40:25 -05:00
parent 4b29e0458f
commit 8f590873d0
4781 changed files with 2241032 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

88
docs/gsg_txn/JAVA/perftune-intro.html Normal file
View File

@@ -0,0 +1,88 @@
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Performance Tuning</title>
<link rel="stylesheet" href="gettingStarted.css" type="text/css" />
<meta name="generator" content="DocBook XSL Stylesheets V1.62.4" />
<link rel="home" href="index.html" title="Getting Started with Berkeley DB Transaction Processing" />
<link rel="up" href="introduction.html" title="Chapter 1. Introduction" />
<link rel="previous" href="recovery-intro.html" title="Recoverability" />
<link rel="next" href="enabletxn.html" title="Chapter 2. Enabling Transactions" />
</head>
<body>
<div class="navheader">
<table width="100%" summary="Navigation header">
<tr>
<th colspan="3" align="center">Performance Tuning</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="recovery-intro.html">Prev</a> </td>
<th width="60%" align="center">Chapter 1. Introduction</th>
<td width="20%" align="right"> <a accesskey="n" href="enabletxn.html">Next</a></td>
</tr>
</table>
<hr />
</div>
<div class="sect1" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h2 class="title" style="clear: both"><a id="perftune-intro"></a>Performance Tuning</h2>
</div>
</div>
<div></div>
</div>
<p>
From a performance perspective, the use of transactions is not free.
Depending on how you configure them, transaction commits
usually require your application to perform disk I/O that a non-transactional
application does not perform. Also, for multi-threaded
<span>and
multi-process</span> applications, the use of transactions can
result in increased lock contention due to extra locking
requirements driven by transactional isolation guarantees.
</p>
<p>
There is therefore a performance tuning component to transactional applications
that is not applicable for non-transactional applications (although
some tuning considerations do exist whether or not your application uses
transactions). Where appropriate, these tuning considerations are
introduced in the following chapters.
<span>
However, for a more complete description of them, see the
<a href="http://www.oracle.com/technology/documentation/berkeley-db/db/ref/transapp/tune.html" target="_top">
Transaction tuning
</a>
and
<a href="http://www.oracle.com/technology/documentation/berkeley-db/db/ref/transapp/throughput.html" target="_top">
Transaction throughput
</a>
sections of the <i class="citetitle">Berkeley DB Programmer's Reference Guide</i>.
</span>
</p>
</div>
<div class="navfooter">
<hr />
<table width="100%" summary="Navigation footer">
<tr>
<td width="40%" align="left"><a accesskey="p" href="recovery-intro.html">Prev</a> </td>
<td width="20%" align="center">
<a accesskey="u" href="introduction.html">Up</a>
</td>
<td width="40%" align="right"> <a accesskey="n" href="enabletxn.html">Next</a></td>
</tr>
<tr>
<td width="40%" align="left" valign="top">Recoverability </td>
<td width="20%" align="center">
<a accesskey="h" href="index.html">Home</a>
</td>
<td width="40%" align="right" valign="top"> Chapter 2. Enabling Transactions</td>
</tr>
</table>
</div>
</body>
</html>