参考:
https://blog.csdn.net/adminwbbmm/article/details/126450388
https://blog.csdn.net/u012551524/article/details/127801844
https://www.runoob.com/postgresql/postgresql-drop-table.html
https://blog.csdn.net/m0_56981185/article/details/120304011
1.登录
psql -h 10.253.100.9 -p 5432 -U postgres -d postgres
密码:postgres
退出命令行:\quit
2.查询所有数据库
select datname from pg_database;
或者
\l
3.查询版本
psql --version
或者
select version();
4.切换数据库
\c test
5.查看当前库中的所有的表
\d
或者
select * from pg_tables;
6.查看数据库大小
SELECT pg_size_pretty(pg_database_size('postgres'));
7.查看表大小
SELECT pg_size_pretty(pg_relation_size('table_test'));
8.查看索引大小
SELECT pg_size_pretty(pg_relation_size('table_test_pkey'));
9.查看表空间大小
SELECT pg_size_pretty(pg_tablespace_size('pg_default'));
10.查看表大小(包含索引)
SELECT pg_size_pretty(pg_total_relation_size(cast('text_table' as text)));
11.查看表(包含索引)大小 Top 10
select
tablename,
pg_size_pretty(size)
from
(select
tablename,
pg_total_relation_size(cast(tablename as text)) as size
from pg_tables
where schemaname = 'public'
) as tmp
order by size desc limit 30;
输出
odpathflowtable_hour_202012 | 66 GB
odpathflowtable_hour_202011 | 41 GB
odpathflowtable_hour_202010 | 39 GB
odpathflowtable_hour_202005 | 30 GB
odpathflowtable_hour_202007 | 30 GB
odpathflowtable_hour_202008 | 30 GB
odpathflowtable_hour_202009 | 29 GB
odpathflowtable_hour_202001 | 28 GB
odpathflowtable_hour_202004 | 28 GB
odpathflowtable_hour_202006 | 27 GB
odpathflowtable_hour_202002 | 27 GB
odpathflowtable_hour_202003 | 26 GB
-
导出表数据
pg_dump -h 10.253.100.9 -p 5432 -U postgres -d postgres -t public.odpathflowtable_hour_202001 > odpathflowtable_hour_202001.dmp
或者
pg_dump -U postgres -d postgres -t customers -a -f customers.sql
其中,-t 参数指定要导出的表名,-a 参数指定只导出数据而不导出表结构,-f 参数指定导出数据的文件名。
-s 这个选项可以只导出表结构,而且不会导出表中数据;
13.删除表
DROP TABLE public.odpathflowtable_hour_202001;
14.查看所有数据库大小
select pg_database.datname, pg_size_pretty(pg_database_size(pg_database.datname)) AS size from pg_database;
15.备份
备份位置是
10.253.100.30
/home/pg-2_backup
拷贝数据
scp odpathflowtable_hour_202001.dmp root@10.253.100.30:/home/pg-2_backup/
kGbTxQ6QEu@a