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<!DOCTYPE html>
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<title>postgresql 进程管理</title>
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title="Permalink to postgresql 进程管理">
postgresql 进程管理
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<abbr class="published" title="2012-11-15T00:00:00">
<i class="icon-calendar"></i>四 15 十一月 2012
</abbr>
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<a href="http://liugehao.github.io/author/liugehao.html"><i class="icon-user"></i>liugehao</a>
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<p>虽然可以使用 kill -9 来强制删除用户进程，但是不建议这么去做。</p>
<p>因为：对于执行update的语句来说，kill掉进程，可能会导致Postgres进入到recovery mode</p>
<p>而在recovery mode下，会锁表，不允许链接数据库。</p>
<p>通常情况下：使用如下语句</p>
<p>{{{#!highlight sql
=# select datname,procpid,query_start,current_query,waiting,client_addr from pg_stat_activity where waiting='t';
}}}</p>
<p>来查看有哪些SQL正在执行。</p>
<p>通过命令：
{{{#!highlight sql
=# select pg_cancel_backend(线程id);
}}}
来kill掉指定的SQL语句。</p>
<p>（这个函数只能 kill Select 查询，而updae,delete DML不生效）</p>
<p>使用
{{{#!highlight sql
=# select pg_terminate_backend(pid int)
}}}
可以kill 各种DML(SELECT,UPDATE,DELETE,DROP)操作</p>
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