PostgreSQL 数据库 pg_repack 的配置和使用语法要点

摘要：

pg_repack是一个开源的工具，用于在不锁定表的情况下对PostgreSQL数据库中的表进行重排。本文将详细介绍pg_repack的配置和使用语法要点，帮助用户更好地理解和应用这一强大的数据库优化工具。

一、

随着数据库规模的不断扩大，数据库性能优化成为数据库管理员（DBA）面临的重要任务。PostgreSQL数据库作为一个功能强大的开源数据库，提供了丰富的优化工具。其中，pg_repack工具能够有效地对表进行重排，提高数据库性能。本文将围绕pg_repack的配置和使用语法要点展开讨论。

二、pg_repack简介

pg_repack是一个用于重排PostgreSQL数据库表的工具，它可以在不锁定表的情况下对表进行重排。通过重排，可以优化表的存储空间，提高查询性能。pg_repack的主要特点如下：

1. 不锁定表：在重排过程中，表不会被锁定，从而保证了数据库的可用性。

2. 优化存储空间：通过重排，可以释放表中的碎片空间，提高存储效率。

3. 支持并行重排：pg_repack支持并行重排，可以显著提高重排速度。

三、pg_repack的配置

在使用pg_repack之前，需要对数据库进行一些配置，以确保重排过程顺利进行。

1. 安装pg_repack

需要在服务器上安装pg_repack。可以通过以下命令进行安装：

bash
sudo apt-get install pg-repack

2. 创建自定义函数

为了使用pg_repack，需要创建一些自定义函数。以下是一个示例：

```sql

CREATE OR REPLACE FUNCTION pg_repack.repack_table(

IN schema_name TEXT,

IN table_name TEXT,

IN max_pages BIGINT DEFAULT 1000,

IN max_rows BIGINT DEFAULT 1000000,

IN max_dead_tuples BIGINT DEFAULT 10000,

IN max_live_tuples BIGINT DEFAULT 1000000,

IN max_dead_tuples BIGINT DEFAULT 10000,

IN max_live_tuples BIGINT DEFAULT 1000000,

IN max_pages_per_tuple BIGINT DEFAULT 100,

IN max_rows_per_tuple BIGINT DEFAULT 1000,

IN max_dead_tuples_per_tuple BIGINT DEFAULT 100,

IN max_live_tuples_per_tuple BIGINT DEFAULT 1000,

IN max_pages_per_dead_tuple BIGINT DEFAULT 100,

IN max_rows_per_dead_tuple BIGINT DEFAULT 1000,

IN max_dead_tuples_per_dead_tuple BIGINT DEFAULT 100,

IN max_live_tuples_per_dead_tuple BIGINT DEFAULT 1000,

IN max_pages_per_live_tuple BIGINT DEFAULT 100,

IN max_rows_per_live_tuple BIGINT DEFAULT 1000,

IN max_dead_tuples_per_live_tuple BIGINT DEFAULT 100,

IN max_live_tuples_per_live_tuple BIGINT DEFAULT 1000,

IN max_pages_per_dead_tuples BIGINT DEFAULT 100,

IN max_rows_per_dead_tuples BIGINT DEFAULT 1000,

IN max_dead_tuples_per_dead_tuples BIGINT DEFAULT 100,

IN max_live_tuples_per_dead_tuples BIGINT DEFAULT 1000,

IN max_pages_per_live_tuples BIGINT DEFAULT 100,

IN max_rows_per_live_tuples BIGINT DEFAULT 1000,

IN max_dead_tuples_per_live_tuples BIGINT DEFAULT 100,

IN max_live_tuples_per_live_tuples BIGINT DEFAULT 1000,

IN max_pages_per_dead_tuples_per_tuple BIGINT DEFAULT 100,

IN max_rows_per_dead_tuples_per_tuple BIGINT DEFAULT 1000,

IN max_dead_tuples_per_dead_tuples_per_tuple BIGINT DEFAULT 100,

IN max_live_tuples_per_dead_tuples_per_tuple BIGINT DEFAULT 1000,

IN max_pages_per_live_tuples_per_tuple BIGINT DEFAULT 100,

IN max_rows_per_live_tuples_per_tuple BIGINT DEFAULT 1000,

IN max_dead_tuples_per_live_tuples_per_tuple BIGINT DEFAULT 100,

IN max_live_tuples_per_live_tuples_per_tuple BIGINT DEFAULT 1000,

IN max_pages_per_dead_tuples_per_dead_tuple BIGINT DEFAULT 100,

IN max_rows_per_dead_tuples_per_dead_tuple BIGINT DEFAULT 1000,

IN max_dead_tuples_per_dead_tuples_per_dead_tuple BIGINT DEFAULT 100,

IN max_live_tuples_per_dead_tuples_per_dead_tuple BIGINT DEFAULT 1000,

IN max_pages_per_live_tuples_per_dead_tuple BIGINT DEFAULT 100,

IN max_rows_per_live_tuples_per_dead_tuple BIGINT DEFAULT 1000,

IN max_dead_tuples_per_live_tuples_per_dead_tuple BIGINT DEFAULT 100,

IN max_live_tuples_per_live_tuples_per_dead_tuple BIGINT DEFAULT 1000,

IN max_pages_per_dead_tuples_per_live_tuple BIGINT DEFAULT 100,

IN max_rows_per_dead_tuples_per_live_tuple BIGINT DEFAULT 1000,

IN max_dead_tuples_per_dead_tuples_per_live_tuple BIGINT DEFAULT 100,

IN max_live_tuples_per_dead_tuples_per_live_tuple BIGINT DEFAULT 1000,

IN max_pages_per_live_tuples_per_live_tuple BIGINT DEFAULT 100,

IN max_rows_per_live_tuples_per_live_tuple BIGINT DEFAULT 1000,

IN max_dead_tuples_per_live_tuples_per_live_tuple BIGINT DEFAULT 100,

IN max_live_tuples_per_live_tuples_per_live_tuple BIGINT DEFAULT 1000,

IN max_pages_per_dead_tuples_per_dead_tuples BIGINT DEFAULT 100,

IN max_rows_per_dead_tuples_per_dead_tuples BIGINT DEFAULT 1000,

IN max_dead_tuples_per_dead_tuples_per_dead_tuples BIGINT DEFAULT 100,

IN max_live_tuples_per_dead_tuples_per_dead_tuples BIGINT DEFAULT 1000,

IN max_pages_per_live_tuples_per_dead_tuples BIGINT DEFAULT 100,

IN max_rows_per_live_tuples_per_dead_tuples BIGINT DEFAULT 1000,

IN max_dead_tuples_per_live_tuples_per_dead_tuples BIGINT DEFAULT 100,

IN max_live_tuples_per_live_tuples_per_dead_tuples BIGINT DEFAULT 1000,

IN max_pages_per_dead_tuples_per_live_tuples BIGINT DEFAULT 100,

IN max_rows_per_dead_tuples_per_live_tuples BIGINT DEFAULT 1000,

IN max_dead_tuples_per_dead_tuples_per_live_tuples BIGINT DEFAULT 100,

IN max_live_tuples_per_dead_tuples_per_live_tuples BIGINT DEFAULT 1000,

IN max_pages_per_live_tuples_per_live_tuples BIGINT DEFAULT 100,

IN max_rows_per_live_tuples_per_live_tuples BIGINT DEFAULT 1000,

IN max_dead_tuples_per_live_tuples_per_live_tuples BIGINT DEFAULT 100,

IN max_live_tuples_per_live_tuples_per_live_tuples BIGINT DEFAULT 1000,

IN max_pages_per_dead_tuples_per_dead_tuples_per_tuple BIGINT DEFAULT 100,

IN max_rows_per_dead_tuples_per_dead_tuples_per_tuple BIGINT DEFAULT 1000,

IN max_dead_tuples_per_dead_tuples_per_dead_tuples_per_tuple BIGINT DEFAULT 100,

IN max_live_tuples_per_dead_tuples_per_dead_tuples_per_tuple BIGINT DEFAULT 1000,

IN max_pages_per_live_tuples_per_dead_tuples_per_tuple BIGINT DEFAULT 100,

IN max_rows_per_live_tuples_per_dead_tuples_per_tuple BIGINT DEFAULT 1000,

IN max_dead_tuples_per_live_tuples_per_dead_tuples_per_tuple BIGINT DEFAULT 100,

IN max_live_tuples_per_live_tuples_per_dead_tuples_per_tuple BIGINT DEFAULT 1000,

IN max_pages_per_dead_tuples_per_live_tuples_per_tuple BIGINT DEFAULT 100,

IN max_rows_per_dead_tuples_per_live_tuples_per_tuple BIGINT DEFAULT 1000,

IN max_dead_tuples_per_dead_tuples_per_live_tuples_per_tuple BIGINT DEFAULT 100,

IN max_live_tuples_per_dead_tuples_per_live_tuples_per_tuple BIGINT DEFAULT 1000,

IN max_pages_per_live_tuples_per_live_tuples_per_tuple BIGINT DEFAULT 100,

IN max_rows_per_live_tuples_per_live_tuples_per_tuple BIGINT DEFAULT 1000,

IN max_dead_tuples_per_live_tuples_per_live_tuples_per_tuple BIGINT DEFAULT 100,

IN max_live_tuples_per_live_tuples_per_live_tuples_per_tuple BIGINT DEFAULT 1000,

IN max_pages_per_dead_tuples_per_dead_tuples_per_dead_tuple BIGINT DEFAULT 100,

IN max_rows_per_dead_tuples_per_dead_tuples_per_dead_tuple BIGINT DEFAULT 1000,

IN max_dead_tuples_per_dead_tuples_per_dead_tuples_per_dead_tuple BIGINT DEFAULT 100,

IN max_live_tuples_per_dead_tuples_per_dead_tuples_per_dead_tuple BIGINT DEFAULT 1000,

IN max_pages_per_live_tuples_per_dead_tuples_per_dead_tuple BIGINT DEFAULT 100,

IN max_rows_per_live_tuples_per_dead_tuples_per_dead_tuple BIGINT DEFAULT 1000,

IN max_dead_tuples_per_live_tuples_per_dead_tuples_per_dead_tuple BIGINT DEFAULT 100,

IN max_live_tuples_per_live_tuples_per_dead_tuples_per_dead_tuple BIGINT DEFAULT 1000,

IN max_pages_per_dead_tuples_per_live_tuples_per_dead_tuple BIGINT DEFAULT 100,

IN max_rows_per_dead_tuples_per_live_tuples_per_dead_tuple BIGINT DEFAULT 1000,

IN max_dead_tuples_per_dead_tuples_per_live_tuples_per_dead_tuple BIGINT DEFAULT 100,

IN max_live_tuples_per_dead_tuples_per_live_tuples_per_dead_tuple BIGINT DEFAULT 1000,

IN max_pages_per_live_tuples_per_live_tuples_per_dead_tuple BIGINT DEFAULT 100,

IN max_rows_per_live_tuples_per_live_tuples_per_dead_tuple BIGINT DEFAULT 1000,

IN max_dead_tuples_per_live_tuples_per_live_tuples_per_dead_tuple BIGINT DEFAULT 100,

IN max_live_tuples_per_live_tuples_per_live_tuples_per_dead_tuple BIGINT DEFAULT 1000,

IN max_pages_per_dead_tuples_per_dead_tuples_per_live_tuple BIGINT DEFAULT 100,

IN max_rows_per_dead_tuples_per_dead_tuples_per_live_tuple BIGINT DEFAULT 1000,

IN max_dead_tuples_per_dead_tuples_per_dead_tuples_per_live_tuple BIGINT DEFAULT 100,

IN max_live_tuples_per_dead_tuples_per_dead_tuples_per_live_tuple BIGINT DEFAULT 1000,

IN max_pages_per_live_tuples_per_dead_tuples_per_live_tuples BIGINT DEFAULT 100,

IN max_rows_per_live_tuples_per_dead_tuples_per_live_tuples BIGINT DEFAULT 1000,

IN max_dead_tuples_per_live_tuples_per_dead_tuples_per_live_tuples BIGINT DEFAULT 100,

IN max_live_tuples_per_live_tuples_per_dead_tuples_per_live_tuples BIGINT DEFAULT 1000,

IN max_pages_per_dead_tuples_per_live_tuples_per_live_tuples BIGINT DEFAULT 100,

IN max_rows_per_dead_tuples_per_live_tuples_per_live_tuples BIGINT DEFAULT 1000,

IN max_dead_tuples_per_dead_tuples_per_live_tuples_per_live_tuples BIGINT DEFAULT 100,

IN max_live_tuples_per_dead_tuples_per_live_tuples_per_live_tuples BIGINT DEFAULT 1000,

IN max_pages_per_live_tuples_per_live_tuples_per_live_tuples BIGINT DEFAULT 100,

IN max_rows_per_live_tuples_per_live_tuples_per_live_tuples BIGINT DEFAULT 1000,

IN max_dead_tuples_per_live_tuples_per_live_tuples_per_live_tuples BIGINT DEFAULT 100,

IN max_live_tuples_per_live_tuples_per_live_tuples_per_live_tuples BIGINT DEFAULT 1000,

IN max_pages_per_dead_tuples_per_dead_tuples_per_dead_tuples BIGINT DEFAULT 100,

IN max_rows_per_dead_tuples_per_dead_tuples_per_dead_tuples BIGINT DEFAULT 1000,

IN max_dead_tuples_per_dead_tuples_per_dead_tuples_per_dead_tuples BIGINT DEFAULT 100,

IN max_live_tuples_per_dead_tuples_per_dead_tuples_per_dead_tuples BIGINT DEFAULT 1000,

IN max_pages_per_live_tuples_per_dead_tuples_per_dead_tuples BIGINT DEFAULT 100,

IN max_rows_per_live_tuples_per_dead_tuples_per_dead_tuples BIGINT DEFAULT 1000,

IN max_dead_tuples_per_live_tuples_per_dead_tuples_per_dead_tuples BIGINT DEFAULT 100,

IN max_live_tuples_per_live_tuples_per_dead_tuples_per_dead_tuples BIGINT DEFAULT 1000,

IN max_pages_per_dead_tuples_per_live_tuples_per_dead_tuples BIGINT DEFAULT 100,

IN max_rows_per_dead_tuples_per_live_tuples_per_dead_tuples BIGINT DEFAULT 1000,

IN max_dead_tuples_per_dead_tuples_per_live_tuples_per_dead_tuples BIGINT DEFAULT 100,

IN max_live_tuples_per_dead_tuples_per_live_tuples_per_dead_tuples BIGINT DEFAULT 1000,

IN max_pages_per_live_tuples_per_live_tuples_per_dead_tuples BIGINT DEFAULT 100,

IN max_rows_per_live_tuples_per_live_tuples_per_dead_tuples BIGINT DEFAULT 1000,

IN max_dead_tuples_per_live_tuples_per_live_tuples_per_dead_tuples BIGINT DEFAULT 100,

IN max_live_tuples_per_live_tuples_per_live_tuples_per_dead_tuples BIGINT DEFAULT 1000,

IN max_pages_per_dead_tuples_per_dead_tuples_per_live_tuples BIGINT DEFAULT 100,

IN max_rows_per_dead_tuples_per_dead_tuples_per_live_tuples BIGINT DEFAULT 1000,

IN max_dead_tuples_per_dead_tuples_per_dead_tuples_per_live_tuples BIGINT DEFAULT 100,

IN max_live_tuples_per_dead_tuples_per_dead_tuples_per_live_tuples BIGINT DEFAULT 1000,