我可以在PostgreSQL 8.4中记录查询执行时间吗？ [英] Can I log query execution time in PostgreSQL 8.4?

问题描述

我想记录一天中运行的每个查询的执行时间。

I want to log each query execution time which is run in a day.

例如，

2012-10-01 13:23:38 STATEMENT: SELECT * FROM pg_stat_database  runtime:265 ms.

请给我一些指导。

推荐答案

如果您设置

log_min_duration_statement = 0
log_statement = all 

，那么您将看到所有语句都被记录到Postgres日志文件中。

in your postgresql.conf, then you will see all statements being logged into the Postgres logfile.

如果启用

log_duration

还将打印每个语句花费的时间。

that will also print the time taken for each statement. This is off by default.

使用 log_statement 参数，您可以控制哪种类型要记录的语句（DDL，DML等）

Using the log_statement parameter you can control which type of statement you want to log (DDL, DML, ...)

这将在日志文件中生成如下输出：

This will produce an output like this in the logfile:

2012-10-01 13:00:43 CEST postgres LOG:  statement: select count(*) from pg_class;
2012-10-01 13:00:43 CEST postgres LOG:  duration: 47.000 ms

手册中的更多详细信息：

More details in the manual:

• http://www.postgresql.org/docs/8.4/static/runtime-config-logging.html#RUNTIME-CONFIG-LOGGING-WHEN


• http://www.postgresql.org/docs/8.4/static/runtime-config-logging.html#RUNTIME-CONFIG-LOGGING-WHAT

• http://www.postgresql.org/docs/8.4/static/runtime-config-logging.html#RUNTIME-CONFIG-LOGGING-WHEN
• http://www.postgresql.org/docs/8.4/static/runtime-config-logging.html#RUNTIME-CONFIG-LOGGING-WHAT

如果需要每日列表，则可能需要将日志文件配置为每天轮换。再次在手册中对此进行了描述。

If you want a daily list, you probably want to configure the logfile to rotate on a daily basis. Again this is described in the manual.

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