我要评论查看当前所有锁
查询 pg_locks 系统视图可以查看当前数据库中的所有锁信息：
select
locktype,
database as db_oid,
relation as rel_oid,
page,
tuple,
virtualtransaction,
pid,
mode,
granted
from pg_locks;
locktype：锁的类型，如表锁、行锁等。relation：被锁定的表的 oid，可以通过pg_class视图查询表名。pid：持有锁的进程 id。mode：锁的模式，如accesssharelock、rowexclusivelock等。granted：是否已经获得锁。
查看特定表的锁
如果你想查看特定表的锁信息，可以结合 pg_class 视图来过滤：
select
l.locktype,
l.database as db_oid,
l.relation as rel_oid,
l.page,
l.tuple,
l.virtualtransaction,
l.pid,
l.mode,
l.granted,
c.relname as table_name
from pg_locks l
join pg_class c on l.relation = c.oid
where c.relname = 'your_table_name'; -- 替换为你的表名
查看数据库级别的锁
如果你怀疑数据库级别的锁，可以使用以下查询：
select
l.locktype,
l.database as db_oid,
l.relation as rel_oid,
l.page,
l.tuple,
l.virtualtransaction,
l.pid,
l.mode,
l.granted,
d.datname as database_name
from pg_locks l
join pg_database d on l.database = d.oid;
查看事务锁的阻塞情况
为了查看事务锁的阻塞情况，可以使用以下查询：
select
blocked_pid,
blocking_pid,
blocked_activity.query as blocked_query,
blocking_activity.query as blocking_query,
blocked_activity.pid as blocked_pid,
blocking_activity.pid as blocking_pid
from
(
select
pid as blocked_pid,
pg_locks.locked_row.mode as lock_mode,
pg_locks.locked_row.relation as relation,
pg_locks.blocking_pid as blocking_pid
from
pg_locks as locked_row
join pg_locks as blocking_lock on
locked_row.locktype = blocking_lock.locktype and
locked_row.database = blocking_lock.database and
locked_row.relation = blocking_lock.relation and
locked_row.page = blocking_lock.page and
locked_row.tuple = blocking_lock.tuple and
locked_row.virtualxid = blocking_lock.virtualxid and
locked_row.transactionid = blocking_lock.transactionid and
locked_row.classid = blocking_lock.classid and
locked_row.objid = blocking_lock.objid and
locked_row.objsubid = blocking_lock.objsubid and
locked_row.pid != blocking_lock.pid and
not locked_row.granted and
blocking_lock.granted
) as blocked_locks
join pg_stat_activity as blocked_activity on blocked_locks.blocked_pid = blocked_activity.pid
join pg_stat_activity as blocking_activity on blocked_locks.blocking_pid = blocking_activity.pid;
解释
blocked_pid：被阻塞的进程 id。blocking_pid：阻塞其他进程的进程 id。blocked_query：被阻塞的查询。blocking_query：阻塞其他查询的查询。
查看锁的等待时间
如果你想知道锁的等待时间，可以结合 pg_stat_activity 视图：
select
pid,
query,
state,
wait_event_type,
wait_event,
now() - query_start as waiting_time
from pg_stat_activity
where state = 'active' and wait_event_type is not null;
注意事项
- 锁是数据库操作的正常部分，但长时间的锁可能会影响性能。
- 如果发现锁竞争严重，可以考虑优化查询、索引或事务逻辑。
- 频繁的锁问题可能需要调整数据库的隔离级别或锁策略。
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