testdb=# SELECT * FROM pg_locks;
   locktype    | database | relation | page | tuple | virtualxid | transactionid | classid | objid | objsubid | virtualtransaction |  pid  |       mode       | granted | fastpath
---------------+----------+----------+------+-------+------------+---------------+---------+-------+----------+--------------------+-------+------------------+---------+----------
 relation      |    16458 |    16459 |      |       |            |               |         |       |          | 4/1232             | 19671 | RowExclusiveLock | t       | t
 virtualxid    |          |          |      |       | 4/1232     |               |         |       |          | 4/1232             | 19671 | ExclusiveLock    | t       | t
 relation      |    16458 |    16459 |      |       |            |               |         |       |          | 3/1404             | 19670 | RowShareLock     | t       | t
 relation      |    16458 |    16459 |      |       |            |               |         |       |          | 3/1404             | 19670 | RowExclusiveLock | t       | t
 virtualxid    |          |          |      |       | 3/1404     |               |         |       |          | 3/1404             | 19670 | ExclusiveLock    | t       | t
 relation      |    16458 |    16459 |      |       |            |               |         |       |          | 5/694              | 19673 | RowExclusiveLock | t       | t
 virtualxid    |          |          |      |       | 5/694      |               |         |       |          | 5/694              | 19673 | ExclusiveLock    | t       | t
 relation      |    16458 |    11090 |      |       |            |               |         |       |          | 2/4                | 16248 | AccessShareLock  | t       | t
 virtualxid    |          |          |      |       | 2/4        |               |         |       |          | 2/4                | 16248 | ExclusiveLock    | t       | t
 transactionid |          |          |      |       |            |        133499 |         |       |          | 4/1232             | 19671 | ShareLock        | f       | f
 tuple         |    16458 |    16459 |    0 |     8 |            |               |         |       |          | 4/1232             | 19671 | ExclusiveLock    | t       | f
 transactionid |          |          |      |       |            |        133498 |         |       |          | 4/1232             | 19671 | ExclusiveLock    | t       | f
 transactionid |          |          |      |       |            |        133499 |         |       |          | 3/1404             | 19670 | ExclusiveLock    | t       | f
 tuple         |    16458 |    16459 |    0 |     8 |            |               |         |       |          | 3/1404             | 19670 | ExclusiveLock    | f       | f
 tuple         |    16458 |    16459 |    0 |     8 |            |               |         |       |          | 5/694              | 19673 | ExclusiveLock    | f       | f
 transactionid |          |          |      |       |            |        133500 |         |       |          | 5/694              | 19673 | ExclusiveLock    | t       | f
(16 rows)