select * from pg_stat_activity where application_name ~ 'example-application'; 我得到了许多状态的行 idle 查询是 COMMIT。它们持久,不会消失。一段时间后,我的申请到达 hibernate.c3p0.max_size (池中的JDBC连接的最大数量)限制并停止使用数据库。 某些应用程序实现详细信息在其他有关线程中描述: 线程池...
query_id, S.query, S.backend_type FROM pg_stat_get_activity(NULL) AS S LEFT JOIN pg_database AS D ON (S.datid = D.oid) LEFT JOIN pg_authid AS U ON (S.usesysid = U.oid); 从视图定义中可以看出,视图中的主要信息来自 pg_stat_get_activity 函数,辅以将函数中输出的每个进程连接到的...
ALTER TABLE tab DROP COLUMN old_col; COMMIT; 你然后可以使用VACUUM FULL tab 指令来使系统收回无效数据所占用的空间。 4.4.单条记录,单个表,单个数据库的最大限制是多少? 下面是一些限制: 单个数据库最大尺寸? 无限制(已存在有 32TB 的数据库) 单个表的最大尺寸? 32 TB 一行记录的最大尺寸? 1.6 TB ...
First thing thatInoticed are the values in query column:<insufficient privilege>. This is because usertestisnotsuperuser, and as such can't see what other users are doing. It can, however, see its own queries, which we can see in the data for connection with pid 848805: $SELECT*FROMpg...
SELECT warehouse_id, query from gp_dist_random('pg_stat_activity_extended') WHERE query LIKE 'insert into test_activity select * from generate_series(1,100);' limit 1; drop table test_activity; 0 comments on commit d73da65 Please sign in to comment. Footer...
default this issue does not happen. But I have found if I edit my connection under “Connection settings”, “Initialization” and if I uncheck Auto-commit and then under “Connection settings”, “Metadata” if I unselect “Open separate connection for metadata read” I can duplicate the ...
query FROM pg_stat_activity ORDER BY 1, 2 SQL ActiveRecord::StatementInvalid: PG::UndefinedColumn: ERROR: column "waiting" does not exist LINE 4: , waiting AS is_waiting ^ : SELECT client_addr AS client_address , datname AS database , pid AS spid , waiting AS is_waiting , query ...
2016年参与生产试验和实时数据中心SDN部署的受访者人数低于预期。Grossner预计89％的受 ...
DCL(data control language)数据控制语言:用来授予或回收访问数据库的某种特权,并控制数据库操纵事务发生的时间及效果,对数据库实行监视等。新建用户(create user),授权(grant),收回(revoke),开启事务(begin),回滚(rollback),提交(commit) DQL(data query language)数据查询语言:SELECT子句,FROM子句,WHERE子句组成的查...
We add new catalog view pg_stat_activity_extended to map query/session to warehouse in cloud. We report warehouse_id in pgstat_report_activity for each query. fix #ISSUE_Number Change logs Describe your change clearly, including what problem is being solved or what feature is being added. ...