1、查看数据库大小: select pg_database_size('log_analysis'); selectpg_database_size('log_analysis');pg_database_size---23799992(1row) 1. 2. 3. 4. 5. 6. 2、select pg_database.datname, pg_size_pretty (pg_database_size(pg_database.datname)) AS size from pg_database; log_anal...
To get the disk space occupied by a database (nicely formatted): SELECT pg_size_pretty(pg_database_size('mydb')); Disk space occupied by a tablespace: SELECT pg_size_pretty(pg_tablespace_size('mytblspace')); Find out more about database object size functions in the manual: Share ...
A key aspect to understand (and this will influence our PostgreSQL database size, as we’ll see shortly) is that when you delete data in PostgreSQL via DELETE FROM, you’re not actually deleting it but marking the rows as unavailable. These unavailable rows are usually referred to as “dea...
select table_name,index_name,t.blevel,t.num_rows,t.leaf_blocks,t.last_analyzed from user_indexes t where table_name in ('T1','T2'); oracle会在一个固定的时间将数据库里的表和索引的相关统计信息进行收集,默认选择周一到周五晚上10点,持续收集4小时,和周六周日早上6点,持续收集20小时。 oracle可...
select pg_database_size('mydb'),pg_size_pretty(pg_database_size('mydb'));--获取表大小--表select pg_size_pretty(pg_relation_size('mytab'));--表及索引select pg_size_pretty(pg_total_relation_size('mytab'));--获取索引大小select pg_size_pretty(pg_indexes_size('mytab'));--获取表...
database编写数据库名,如果写all,代表所有库都可以连接 # 第三块 user编写连接的用户,可以写all,代表所有用户 # 第四块 address代表那些IP地址可以连接 # 第五块 method加密方式,这块不用过多关注,直接md5 # 直接来个痛快的配置吗,允许任意地址的全部用户连接所有数据库 ...
pg_database_size(name) bigint 指定名称的数据库使用的磁盘空间 pg_relation_size(oid) bigint 指定OID代表的表或者索引所使用的磁盘空间 pg_relation_size(text) bigint 指定名称的表或者索引使用的磁盘空间。这个名字可以用模式名修饰 pg_total_relation_size(oid) bigint 指定OID代表的表使用的磁盘空间,包括...
JDBC驱动程序直接读取PostgreSQL Frontend/Backend Protocol，发送的message为Execute：Execute (F)Byte1('E...
parents=palloc(sizeof(TransactionState)*s->nestingLevel); 然后通过循环得方式, 为每一个子事务来分配事务ID 代码语言:javascript 复制 while(p!=NULL&&!TransactionIdIsValid(p->transactionId)){parents[parentOffset++]=p;p=p->parent;} PG 获取事务ID 主要是通过无符号整型事务ID的计数器来分配事务ID ,...
(pg_database.datname))ASsizefrompg_database;#查看表大小selectpg_size_pretty(pg_relation_size(table_name))#按占空间大小,顺序查看所有表的大小selectrelname,pg_size_pretty(pg_relation_size(relid))frompg_stat_user_tableswhereschemaname='public'orderbypg_relation_size(relid)desc;selectschemaname,...