[
MAINHACK
]
Mail Test
BC
Config Scan
HOME
Create...
New File
New Folder
Viewing / Editing File: non-durability.html
File is not writable. Editing disabled.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >Non-Durable Settings</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REV="MADE" HREF="mailto:pgsql-docs@postgresql.org"><LINK REL="HOME" TITLE="PostgreSQL 9.2.24 Documentation" HREF="index.html"><LINK REL="UP" TITLE="Performance Tips" HREF="performance-tips.html"><LINK REL="PREVIOUS" TITLE="Populating a Database" HREF="populate.html"><LINK REL="NEXT" TITLE="Server Administration" HREF="admin.html"><LINK REL="STYLESHEET" TYPE="text/css" HREF="stylesheet.css"><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=ISO-8859-1"><META NAME="creation" CONTENT="2017-11-06T22:43:11"></HEAD ><BODY CLASS="SECT1" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="5" ALIGN="center" VALIGN="bottom" ><A HREF="index.html" >PostgreSQL 9.2.24 Documentation</A ></TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A TITLE="Populating a Database" HREF="populate.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="performance-tips.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="60%" ALIGN="center" VALIGN="bottom" >Chapter 14. Performance Tips</TD ><TD WIDTH="20%" ALIGN="right" VALIGN="top" ><A TITLE="Server Administration" HREF="admin.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="NON-DURABILITY" >14.5. Non-Durable Settings</A ></H1 ><P > Durability is a database feature that guarantees the recording of committed transactions even if the server crashes or loses power. However, durability adds significant database overhead, so if your site does not require such a guarantee, <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > can be configured to run much faster. The following are configuration changes you can make to improve performance in such cases. Except as noted below, durability is still guaranteed in case of a crash of the database software; only abrupt operating system stoppage creates a risk of data loss or corruption when these settings are used. <P ></P ></P><UL ><LI ><P > Place the database cluster's data directory in a memory-backed file system (i.e. <ACRONYM CLASS="ACRONYM" >RAM</ACRONYM > disk). This eliminates all database disk I/O, but limits data storage to the amount of available memory (and perhaps swap). </P ></LI ><LI ><P > Turn off <A HREF="runtime-config-wal.html#GUC-FSYNC" >fsync</A >; there is no need to flush data to disk. </P ></LI ><LI ><P > Turn off <A HREF="runtime-config-wal.html#GUC-FULL-PAGE-WRITES" >full_page_writes</A >; there is no need to guard against partial page writes. </P ></LI ><LI ><P > Increase <A HREF="runtime-config-wal.html#GUC-CHECKPOINT-SEGMENTS" >checkpoint_segments</A > and <A HREF="runtime-config-wal.html#GUC-CHECKPOINT-TIMEOUT" >checkpoint_timeout</A >; this reduces the frequency of checkpoints, but increases the storage requirements of <TT CLASS="FILENAME" >/pg_xlog</TT >. </P ></LI ><LI ><P > Turn off <A HREF="runtime-config-wal.html#GUC-SYNCHRONOUS-COMMIT" >synchronous_commit</A >; there might be no need to write the <ACRONYM CLASS="ACRONYM" >WAL</ACRONYM > to disk on every commit. This setting does risk transaction loss (though not data corruption) in case of a crash of the <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >database</I ></SPAN > alone. </P ></LI ></UL ><P> </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="populate.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="admin.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Populating a Database</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="performance-tips.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Server Administration</TD ></TR ></TABLE ></DIV ></BODY ></HTML >
Save Changes
Cancel / Back
Close ×
Server Info
Hostname: server05.hostinghome.co.in
Server IP: 192.168.74.40
PHP Version: 7.4.33
Server Software: Apache
System: Linux server05.hostinghome.co.in 3.10.0-962.3.2.lve1.5.81.el7.x86_64 #1 SMP Wed May 31 10:36:47 UTC 2023 x86_64
HDD Total: 1.95 TB
HDD Free: 727.76 GB
Domains on IP: N/A (Requires external lookup)
System Features
Safe Mode:
Off
disable_functions:
None
allow_url_fopen:
On
allow_url_include:
Off
magic_quotes_gpc:
Off
register_globals:
Off
open_basedir:
None
cURL:
Enabled
ZipArchive:
Disabled
MySQLi:
Enabled
PDO:
Enabled
wget:
Yes
curl (cmd):
Yes
perl:
Yes
python:
Yes
gcc:
Yes
pkexec:
No
git:
Yes
User Info
Username: itsweb
User ID (UID): 1619
Group ID (GID): 1621
Script Owner UID: 1619
Current Dir Owner: N/A