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 = ...
3、查看TPS\QPS 3.1 QPS with a as (select sum(calls) s from public.pg_stat_statements where dbid in (select oid from pg_database where datname not in ('postgres','template0','template1'))), b as (select sum(calls) s,pg_sleep(10) from public.pg_stat_statements where dbid in (...
PGPROC*bgworkerFreeProcs; /* Head of list of walsender free PGPROC structures */ PGPROC*walsenderFreeProcs; /* First pgproc waiting for group XID clear */ pg_atomic_uint32procArrayGroupFirst; /* First pgproc waiting for group transaction status update */ pg_atomic_uint32clogGroupFirst...
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...
[]; 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...
相当于sleep。爆内存限制的时候，cpu也是很高，猜测是来不及gc，试了pg sleep也可以达到效果。此回答...
[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". ...
if (rc == WL_TIMEOUT && can_hibernate && prev_hibernate) { /* Ask for notification at next buffer allocation */ StrategyNotifyBgWriter(MyProc->pgprocno); /* Sleep ... */ (void) WaitLatch(MyLatch, WL_LATCH_SET | WL_TIMEOUT | WL_EXIT_ON_PM_DEATH, BgWriterDelay * HIBERNATE_...
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);