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
b1cbd2b5
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
b1cbd2b5
编写于
1月 30, 2014
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
docs: add mention of index swapping
Backpatch to 9.3 Greg Smith
上级
146604ec
变更
2
隐藏空白更改
内联
并排
Showing
2 changed file
with
21 addition
and
3 deletion
+21
-3
doc/src/sgml/maintenance.sgml
doc/src/sgml/maintenance.sgml
+20
-2
doc/src/sgml/ref/create_index.sgml
doc/src/sgml/ref/create_index.sgml
+1
-1
未找到文件。
doc/src/sgml/maintenance.sgml
浏览文件 @
b1cbd2b5
...
...
@@ -748,8 +748,9 @@ analyze threshold = analyze base threshold + analyze scale factor * number of tu
<para>
In some situations it is worthwhile to rebuild indexes periodically
with the <xref linkend="sql-reindex">
command.
with the <xref linkend="sql-reindex"> command or a series of individual
rebuilding steps.
</para>
<para>
...
...
@@ -775,6 +776,23 @@ analyze threshold = analyze base threshold + analyze scale factor * number of tu
(This consideration does not apply to non-B-tree indexes.) It
might be worthwhile to reindex periodically just to improve access speed.
</para>
<para>
<xref linkend="sql-reindex"> can be used safely and easily in all cases.
But since the command requires an exclusive table lock, it is
often preferable to execute an index rebuild with a sequence of
creation and replacement steps. Index types that support
<xref linkend="sql-createindex"> with the <literal>CONCURRENTLY</>
option can instead be recreated that way. If that is successful and the
resulting index is valid, the original index can then be replaced by
the newly built one using a combination of <xref linkend="sql-alterindex">
and <xref linkend="sql-dropindex">. When an index is used to enforce
uniqueness or other constraints, <xref linkend="sql-altertable"> might
be necessary to swap the existing constraint with one enforced by
the new index. Review this alternate multi-step rebuild approach
carefully before using it as there are limitations on which
indexes can be reindexed this way, and errors must be handled.
</para>
</sect1>
...
...
doc/src/sgml/ref/create_index.sgml
浏览文件 @
b1cbd2b5
...
...
@@ -405,7 +405,7 @@ CREATE [ UNIQUE ] INDEX [ CONCURRENTLY ] [ <replaceable class="parameter">name</
</para>
<para>
If a problem arises while scanning the table, such as a
If a problem arises while scanning the table, such as a
deadlock or a
uniqueness violation in a unique index, the <command>CREATE INDEX</>
command will fail but leave behind an <quote>invalid</> index. This index
will be ignored for querying purposes because it might be incomplete;
...
...
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