FROM pg_stat_get_activity(NULL) AS S JOIN pg_stat_get_wal_senders() AS W ON (S.pid = W.pid) LEFT JOIN pg_authid AS U ON (S.usesysid = U.oid); sent_lsn,write_lsn等指标来自pg_stat_get_wal_senders函数 Datum pg_stat_get_wal_senders(PG_FUNCTION_ARGS) { #define PG_STAT_GET_...
pg_stat_activity是PostgreSQL原生工具,官方说明如下:The pg_stat_activity view will have one row per server process, showing information related to the current activity of that process(该pg_stat_activity视图将为每个服务器进程显示一行,显示与该进程的当前活动相关的信息)。pg_stat_activity作为查询监控的视...
普通用户只能查看到自己账户所对应的会话状态。即其他账户的state信息为空。例如以judy用户连接数据库后,在pg_stat_activity中查看到的普通用户joe及初始用户omm的state信息为空: SELECT datname, usename, usesysid, state,pid FROM pg_stat_activity;
另外还可以查看连接数是不是过多等问题。selectcount(*)frompg_stat_activitywherestate=‘idle’;--统计当前有多少活跃的客户端selectcount(*)frompg_stat_activitywherenotpid=pg_backend_pid();--查看一个后端进程运行了多久,以及它当前是否在等待selectpid,state,CURRENT_TIMESTAMP-least(query_start,xact_start...
select datname,usename,query,xact_start,now()-xact_start xact_duration,query_start,now()-query_start query_duration,state from pg_stat_activity where state<>$$idle$$ and (backend_xid is not null or backend_xmin is not null) and now()-xact_start > interval $$30 min$$ order by xac...
PG_STAT_ACTIVITY inet 连接到该后台的客户端的IP地址。 如果此字段取值是null,表明是通过服务器机器上UNIX套接字连接客户端或者这是内部进程,如autovacuum。 client_hostname text 客户端的主机名,这个字段是通过client_addr的反向DNS查找得到。这个 来自:帮助中心 ...
pg_stat_activity 是postgrsql 实例维护的一个进程相关的视图,是实时变化的。 1、pg_stat_activity表(9.6 版本之后 pg_stat_activity 视图的 waiting 字段被 wait_event_type 和 wait_event 字段取代,这两个字段分别代表等待事件的类型、等待事件名称) ...
state, S.backend_xid, s.backend_xmin, S.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_...
shared_preload_libraries = 'auth_delay,passwordcheck,pg_stat_statements,auto_explain' # 建议防止暴力破解, 密码复杂度检测, 开启pg_stat_statements, 开启auto_explain, 参考 http://blog.163.com/digoal@126/blog/static/16387704020149852941586 bgwriter_delay = 10ms # bgwriter process间隔多久调用write接口(...
Notice the short interval between state_change and log_time. The clients all happen to just change state when querying pg_stat_activity. Could there be a race condition between executing pg_stat_get_activity(null) and the server cleaning up closed connections? Closed connections still appear but...