relname,n_live_tup FROM pg_stat_user_tables ORDER BY n_live_tup DESC;这也可以显示有多少行已死，这本身就是一个有趣的数字。第三种方法是注意系统
2、通过SQL语句查询 "select * from pg_tables" —— 得到当前db中所有表的信息(这里pg_tables是系统视图) "select tablename from pg_tables where schemaname='public'" —— 得到所有用户自定义表的名字(这里"tablename"字段是表的名字,"schemaname"是schema的名字。用户自定义的表,如果未经特殊处理,默认都...
select current_database(),b.nspname,c.relname,c.relkind,pg_size_pretty(pg_relation_size(c.oid)),a.seq_scan,a.seq_tup_read,a.idx_scan,a.idx_tup_fetch,a.n_tup_ins,a.n_tup_upd,a.n_tup_del,a.n_tup_hot_upd,a.n_live_tup,a.n_dead_tup from pg_stat_all_tables a, pg_clas...
\gdesc describe result of query, without executing it \gexec execute query, then execute each value in its result \gset [PREFIX] execute query and store results in psql variables \gx [FILE] as \g, but forces expanded output mode \q quit psql \watch [SEC] execute query every SEC secon...
primary> CREATE PUBLICATION my_publication FOR ALL TABLES; CREATE PUBLICATION 必须在主服务器上为备用复制槽创建发布似乎有些不一致,而且在操作方面也不理想,但这种要求可能有充分的理由。 接下来我们看一下连接器配置。这是通过基于 JSON 的配置文件完成的,如下所示: ...
postgres=# SELECT * FROM MyTest."MyUser".testtables; ERROR: cross-database references are not implemented: "otherdb.otheruser.sometable" LINE 1: select * from otherdb.otheruser.sometable 在PostgreSQL中,数据库在物理上是相互隔离的,对它们的访问控制也是在会话层次上进行的。然而模式只是逻辑上的对...
track_io_timing还将开始收集多个视图的统计信息,包括pg_stat_database、pg_stat_all_tables、pg_stat_user_tables。此数据显示块读取(使用的 I/O)和块命中(数据已位于共享缓冲区中)。数据持续更新,通常会找与块命中相比读取块非常高的用户表。 代码语言:javascript ...
typedef struct FdwRoutine { NodeTag type; /* Functions for scanning foreign tables */ GetForeignRelSize_function GetForeignRelSize; GetForeignPaths_function GetForeignPaths; GetForeignPlan_function GetForeignPlan; BeginForeignScan_function BeginForeignScan; IterateForeignScan_function IterateForeignScan; ...
()"master: truemetrics:- start_time_seconds:usage: "GAUGE"description: "Time at which postmaster started"pg_stat_user_tables:query: |SELECTcurrent_database() datname,schemaname,relname,seq_scan,seq_tup_read,idx_scan,idx_tup_fetch,n_tup_ins,n_tup_upd,n_tup_del,n_tup_hot_upd,n_live_...
创建一个新的迁移 python manage.py makemigrations appname --empty --name Distribute_tables。编辑结果如下所示: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 from django.db import migrations from django_multitenant.db import migrations as tenant_migrations class Migration(migrations.Migration): ...