Skip to content
体验新版
项目
组织
正在加载...
登录
切换导航
打开侧边栏
Greenplum
Gpdb
提交
7c6bac00
G
Gpdb
项目概览
Greenplum
/
Gpdb
通知
7
Star
1
Fork
0
代码
文件
提交
分支
Tags
贡献者
分支图
Diff
Issue
0
列表
看板
标记
里程碑
合并请求
0
DevOps
流水线
流水线任务
计划
Wiki
0
Wiki
分析
仓库
DevOps
项目成员
Pages
G
Gpdb
项目概览
项目概览
详情
发布
仓库
仓库
文件
提交
分支
标签
贡献者
分支图
比较
Issue
0
Issue
0
列表
看板
标记
里程碑
合并请求
0
合并请求
0
Pages
DevOps
DevOps
流水线
流水线任务
计划
分析
分析
仓库分析
DevOps
Wiki
0
Wiki
成员
成员
收起侧边栏
关闭侧边栏
动态
分支图
创建新Issue
流水线任务
提交
Issue看板
体验新版 GitCode,发现更多精彩内容 >>
提交
7c6bac00
编写于
4月 05, 2000
作者:
B
Bruce Momjian
浏览文件
操作
浏览文件
下载
电子邮件补丁
差异文件
Update vacuum to mention analyze
上级
a7b1ff66
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
10 addition
and
4 deletion
+10
-4
doc/src/sgml/ref/vacuum.sgml
doc/src/sgml/ref/vacuum.sgml
+10
-4
未找到文件。
doc/src/sgml/ref/vacuum.sgml
浏览文件 @
7c6bac00
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/vacuum.sgml,v 1.
7 1999/12/07 22:41:4
1 momjian Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/vacuum.sgml,v 1.
8 2000/04/05 21:51:1
1 momjian Exp $
Postgres documentation
-->
...
...
@@ -51,8 +51,6 @@ VACUUM [ VERBOSE ] ANALYZE [ <replaceable class="PARAMETER">table</replaceable>
<para>
Updates column statistics used by the optimizer to
determine the most efficient way to execute a query.
The statistics represent the disbursion of the data in each column.
This information is valuable when several execution paths are possible.
</para>
</listitem>
</varlistentry>
...
...
@@ -158,6 +156,13 @@ NOTICE: Index <replaceable class="PARAMETER">index</replaceable>: Pages 28;
tuples and number of pages stored in all classes.
</para>
<para>
<command>VACUUM ANALYZE</command> collects statistics representing the
disbursion of the data in each column.
This information is valuable when several query execution paths are possible.
</para>
<para>
Running <command>VACUUM</command>
periodically will increase the speed of the database in processing user queries.
...
...
@@ -179,11 +184,12 @@ NOTICE: Index <replaceable class="PARAMETER">index</replaceable>: Pages 28;
query may be executed at any time, however. In particular, after
copying a large class into <productname>Postgres</productname>
or after deleting a large number of
records, it may be a good idea to issue a <command>VACUUM</command>
records, it may be a good idea to issue a <command>VACUUM
ANALYZE
</command>
query. This will update the system catalogs with the results of all
recent changes, and allow the <productname>Postgres</productname>
query optimizer to make better choices in planning user queries.
</para>
</refsect2>
</refsect1>
...
...
编辑
预览
Markdown
is supported
0%
请重试
或
添加新附件
.
添加附件
取消
You are about to add
0
people
to the discussion. Proceed with caution.
先完成此消息的编辑!
取消
想要评论请
注册
或
登录