在postgresql.conf中设置 statement_timeout 就可以实现对所有的查询都能超过指定的时间后就断开查询: 会话中使用: SET statement_timeout = 10000; SET test=# SELECT pg_sleep(15); ERROR: canceling statement due to statement timeout 事务中使用: begin; set local statement_time='1000ms'; select count(...
我希望我的Spring Boot应用程序对Postgres数据库进行的JPA查询在5秒后超时。我创建了这个20秒的查询来测试超时: @Query(value = "select count(*) from pg_sleep(20)", nativeQuery = true) int slowQuery=5000 但是查询不会在3s或5s后超时(执行仍然需要20s )。奇怪的是,如果我用@Transactional(timeout = ...
SELECT pg_sleep(2); -- 模拟2秒查询 查看PostgreSQL日志文件,应能看到类似的输出: plaintext 2024-11-14 10:00:00.123 CST [12345] LOG: duration: 2003.123 ms statement: SELECT pg_sleep(2); 3. 分析慢SQL语句的执行计划 发现慢查询后,可以使用EXPLAIN或EXPLAIN ANALYZE来分析查询的执行计划。EXPLAIN仅...
any pg_on_exit_callback registered before or during this function must be prepared to execute at any instant between here and the end of this function. Furthermore, affected callbacks execute partially or not at all when a second exit-inducing signal arrives after proc_...
with a as (select sum(xact_commit)+sum(xact_rollback) s from pg_stat_database where datname not in ('postgres','template0','template1')), b as (select sum(xact_commit)+sum(xact_rollback) s,pg_sleep(10) from pg_stat_database where datname not in ('postgres','template0','tem...
[postgres@shawnyan ~]$exportPGDATABASE=shawnyan [postgres@shawnyan ~]$ psql psql (15.2) Type"help"forhelp. (postgres@192) [shawnyan] 10:22:30# \conninfo You are connected to database"shawnyan"as user"postgres"on host"192.168.8.151"at port"6666". ...
[postgres@shawnyan ~]$ export PGUSER=shawnyan [postgres@shawnyan ~]$ psql psql (15.2) Type "help" for help. (shawnyan@192) [shawnyan] 10:26:41# \conninfo You are connected to database "shawnyan" as user "shawnyan" on host "192.168.8.151" at port "6666". ...
Copy selectclock_timestamp(),clock_timestamp() --2020-03-0516:59:04.264526+08|2020-03-0516:59:04.264527+08(不一样) 六、Delaying Execution# pg_sleep()让当前的会话进程休眠 seconds 秒以后再执行。 Copy SELECTpg_sleep(1.5);
[]; BEGIN...,执行结果为: postgres=# truncate t_plpgsql_transaction_20230406_01; TRUNCATE TABLE postgres=# call p_outter...(); NOTICE: count: {1,2} NOTICE: count: {1,2,10,20} 那么如果在函数p_outter执行pg_sleep期间内,在另一个会话中插入一条数据后会发生什么...-- 当前会话能看到999...
*/ //等待信号,或者CheckPointTimeout超时到了,或者归档超时需要切换xlog文件 now = (pg_time_t) time(NULL); elapsed_secs = now - last_checkpoint_time; if (elapsed_secs >= CheckPointTimeout) continue; /* no sleep for us ... */ cur_timeout = CheckPointTimeout - elapsed_secs; if (XLog...