selectpg_size_pretty(pg_relation_size('表名')); 2、查询所有表的大小并排序(包含索引) 1 2 3 4 5 SELECTtable_schema ||'.'|| table_nameAStable_full_name, pg_size_pretty(pg_total_relation_size('"'|| table_schema ||'"."'|| table_name ||'"'))ASsize FROMinformation_schema.tables O...
SELECT pg_size_pretty(pg_database_size('db_name')); 4.查找 postgresql 数据库的单个表大小-包括依赖索引: SELECT pg_size_pretty(pg_total_relation_size('Employee_Table')); 5. postgresql 数据库的单个表大小-不包括依赖项大小: SELECT pg_size_pretty(pg_relation_size('Employee_table')); 6.post...
--pg_size_pretty(pg_relation_size(relid)) as "table_size", pg_relation_size(relid)/1024/1024 as "size_Mb", to_char(r.reltuples,'999999999999999999999') as "table_cnt" from pg_stat_user_tables t inner join pg_namespace n on t.schemaname = n.nspname inner join pg_class r on r...
postgres=# SELECT pg_relation_size('user_order') AS size_bytes, postgres-# pg_size_pretty(pg_relation_size('user_order')) AS size_pretty; size_bytes | size_pretty ---+--- 117030912 | 112 MB (1 row) postgres=# \i /home/postgres/test/bin/p1_alignment_padding.sql Table | Table ...
select indexrelname, pg_size_pretty(pg_relation_size(relid)) as size from pg_stat_user_indexes where schemaname='public'; 名词解释 FSM,指的是Free Space Map,空闲空间映射表。一个relation有多个8KB大小的block,这些block存储在磁盘上。一个relation最大只能有4G个block,每个block大小为8KB,也就是说一...
使用pg_size_pretty函数:pg_size_pretty函数将字节大小转换为易读的格式。例如,要获取名为column_name的列的易读字节大小,可以使用以下查询语句: 这将返回column_name列中每个值的易读字节大小。 PostgreSQL是一种开源的关系型数据库管理系统,具有可扩展性和高度可靠性。它被广泛应用于各种应用场景,包括Web应用程序、数...
最近系统生产环境上实例表出现快速膨胀的问题。表膨胀是指表的数据和索引所占文件系统的空间,在有效数据量并未发生大的变化的情况下,不断增大。PG使用过程中需要特别关注这方面. 通过SQL查表的空间大小: SELECT relname, age(relfrozenxid) as xid_age, pg_size_pretty(pg_table_size(oid)) as table_size,rel...
SELECTpg_database.datnameASdatabase_name,pg_size_pretty(pg_database_size(pg_database.datname))ASsizeFROMpg_databaseORDERBYpg_database_size(pg_database.datname)DESC; 这个查询利用了pg_database_size函数来获取每个数据库的大小,并使用pg_size_pretty函数将大小转换为更易读的格式。
SELECT pg_database.datname AS database_name, pg_size_pretty(pg_database_size(pg_database.datname)) AS size FROM pg_database ORDER BY pg_database_size(pg_database.datname) DESC; 复制代码 这个查询将返回所有数据库的名称和大小,按大小降序排列。您可以在PostgreSQL的命令行界面或任何支持SQL查询...
pg_stat_all_indexes 这个表是展示postgresql 的表的索引的状态.查询无用的索引的 代码语言:javascript 复制 SELECTrelname,indexrelname,idx_scan,idx_tup_read,idx_tup_fetch,pg_size_pretty(pg_relation_size(indexrelname::regclass))assizeFROMpg_stat_all_indexesWHEREschemaname='public'ANDindexrelnameNOTLIKE'...