查看所有数据库占用磁盘空间
SELECT
pg_database.datname AS "数据库名称",
pg_size_pretty(pg_database_size(pg_database.datname)) AS "磁盘占用空间"
FROM
pg_database;
发现有个数据库占用空间过大
查询库中所有表占用空间
SELECT
table_name,
pg_size_pretty(total_size) AS total_size
FROM (
SELECT
table_name,
pg_total_relation_size(table_name::regclass) AS total_size
FROM
information_schema.tables
WHERE
table_schema = 'public' -- 你的数据库架构，通常是'public'
) AS table_sizes
ORDER BY
total_size DESC;
发现有两张表超大，与实际数据量不符
安装pg_repack
yum install pg_repack12.x86_64
修改pg配置postgresql.conf
shared_preload_libraries = 'pg_repack'
重启pg
在数据库中创建扩展
CREATE EXTENSION pg_repack;
测试使用
/usr/pgsql-12/bin/pg_repack -h 10.10.33.14 -U postgres --dry-run -d test_db --table tset_table
如下则表示可以使用
尝试使用
/usr/pgsql-12/bin/pg_repack -h 10.10.33.14 -U postgres --no-kill-backend --wait-timeout=3600 -d test_db --table test_table
关于参数介绍，可以参考pg_repack 1.5.0 – Reorganize tables in PostgreSQL databases with minimal locks
