postgresql表死锁问题的排查方式

select *
from pg_stat_activity
where state = 'active';

select a.locktype, a.database, a.pid, a.mode, a.relation, b.relname
from pg_locks a
join pg_class b on a.relation = b.oid
where lower(b.relname) = 'h5_game';

select pg_terminate_backend(pid)
from pg_stat_activity
where state = 'active'
and pid != pg_backend_pid()
--and pid = 14172
and pid in (select a.pid
from pg_locks a
join pg_class b on a.relation = b.oid
where lower(b.relname) = 'news_content')

/* NoLock is not a lock mode, but a flag value meaning "don't get a lock" */
#define NoLock                 0
 
#define AccessShareLock         1        /* SELECT */
#define RowShareLock          2        /* SELECT FOR UPDATE/FOR SHARE */
#define RowExclusiveLock        3        /* INSERT, UPDATE, DELETE */
#define ShareUpdateExclusiveLock 4       /* VACUUM (non-FULL),ANALYZE, CREATE
                                         * INDEX CONCURRENTLY */
#define ShareLock                5        /* CREATE INDEX (WITHOUT CONCURRENTLY) */
#define ShareRowExclusiveLock  6        /* like EXCLUSIVE MODE, but allows ROW
                                         * SHARE */
#define ExclusiveLock          7        /* blocks ROW SHARE/SELECT...FOR
                                         * UPDATE */
#define AccessExclusiveLock       8        /* ALTER TABLE, DROP TABLE, VACUUM
                                         * FULL, and unqualified LOCK TABLE */

select pid,query,* from pg_stat_activity where datname='死锁的数据库' and wait_event_type = 'Lock';
select pg_cancel_backend('死锁那条数据的pid值');##只能杀死select 语句, 对其他语句不生效
pg_terminate_backend('死锁那条数据的pid值');#select,drop等各种操作

select oid,relname from pg_class where relname='table name';
select locktype,pid,relation,mode,granted,* from pg_locks where relation= '上面查询出来的oid';
select pg_terminate_backend('进程ID');