gtlions=# select * from pg_locks where pid=14027;
locktype | database | relation | page | tuple | transactionid | classid | objid | objsubid | transaction | pid | mode | granted | mppsessionid |
mppiswriter | gp_segment_id
---------------+----------+----------+------+-------+---------------+---------+-------+----------+-------------+-------+---------------------+---------+--------------+
-------------+---------------
relation | 17020 | 11052151 | | | | | | | 1662808322 | 14027 | AccessExclusiveLock | t | 113747736 |
t | -1
transactionid | | | | | 1662808322 | | | | 1662808322 | 14027 | ExclusiveLock | t | 113747736 |
t | -1
relation | 17020 | 11051470 | | | | | | | 1662808322 | 14027 | ShareLock | t | 113747736 |
t | -1
relation | 17020 | 11051470 | | | | | | | 1662808322 | 14027 | AccessExclusiveLock | t | 113747736 |
t | -1
relation | 17020 | 11052150 | | | | | | | 1662808322 | 14027 | ShareLock | t | 113747736 |
t | -1
relation | 17020 | 11052150 | | | | | | | 1662808322 | 14027 | AccessExclusiveLock | t | 113747736 |
t | -1
(6 rows)
gtlions=# select * from pg_locks where relation='gtlions.cannottruncatetable'::regclass;
locktype | database | relation | page | tuple | transactionid | classid | objid | objsubid | transaction | pid | mode | granted | mppsessionid | mppi
swriter | gp_segment_id
----------+----------+----------+------+-------+---------------+---------+-------+----------+-------------+-------+---------------------+---------+--------------+-----
--------+---------------
relation | 17020 | 11051470 | | | | | | | 1662808322 | 14027 | ShareLock | t | 113747736 | t
| -1
relation | 17020 | 11051470 | | | | | | | 1662808322 | 14027 | AccessExclusiveLock | t | 113747736 | t
| -1
relation | 17020 | 11051470 | | | | | | | 2653373155 | 15567 | AccessExclusiveLock | f | 113747736 | t
| 0
relation | 17020 | 11051470 | | | | | | | 0 | 13773
| AccessShareLock | t | 75284454 | f
| 0
relation | 17020 | 11051470 | | | | | | | 2653366790 | 15569 | AccessExclusiveLock | f | 113747736 | t
| 1
relation | 17020 | 11051470 | | | | | | | 0 | 13789 | AccessShareLock | t | 75284454 | f
| 1
relation | 17020 | 11051470 | | | | | | | 0 | 13807 | AccessShareLock | t | 75284454 | f
| 2
relation | 17020 | 11051470 | | | | | | | 2653175988 | 15572 | AccessExclusiveLock | f | 113747736 | t
| 2
relation | 17020 | 11051470 | | | | | | | 0 | 13830 | AccessShareLock | t | 75284454 | f
| 3
relation | 17020 | 11051470 | | | | | | | 2653198212 | 15577 | AccessExclusiveLock | f | 113747736 | t
| 3
relation | 17020 | 11051470 | | | | | | | 2653197212 | 15583 | ShareLock | t | 113747736 | t
| 4
relation | 17020 | 11051470 | | | | | | | 2653197212 | 15583 | AccessExclusiveLock | t | 113747736 | t
| 4
relation | 17020 | 11051470 | | | | | | | 0 | 13858 | AccessShareLock | t | 75284454 | f
| 5
relation | 17020 | 11051470 | | | | | | | 2653196128 | 15589 | AccessExclusiveLock | f | 113747736 | t
| 5
relation | 17020 | 11051470 | | | | | | | 0 | 13091 | AccessShareLock | t | 75284454 | f
| 6
relation | 17020 | 11051470 | | | | | | | 2653195038 | 16256 | AccessExclusiveLock | f | 113747736 | t
| 6
relation | 17020 | 11051470 | | | | | | | 0 | 13098 | AccessShareLock | t | 75284454 | f
| 7
gtlions=# select * from pg_locks where relation='gtlions.cannottruncatetable'::regclass and pid!=14027;
locktype | database | relation | page | tuple | transactionid | classid | objid | objsubid | transaction | pid | mode | granted | mppsessionid | mppi
swriter | gp_segment_id
----------+----------+----------+------+-------
TRUNCATETABLEHANG(四)
的Location在爱尔兰，这会估计人家正在休息，只好自己继续摸索：