Re: Waiting for select - Mailing list pgsql-general
| From | Joshua D. Drake |
|---|---|
| Subject | Re: Waiting for select |
| Date | |
| Msg-id | 42AA0C2B.9010405@commandprompt.com Whole thread Raw |
| In response to | Waiting for select (Marc Munro <marc@bloodnok.com>) |
| List | pgsql-general |
Marc Munro wrote: > Can someone explain this? I seem to have a query which is being blocked > by a lock. I was under the impression that selects are never blocked. > Am I missing something or is this bad behaviour? Do you happen to be running a vacuum full? > > I am using slony and am synchronising a slave for the first time. In > the hope of seeing some progress on the slave I attempt to perform a > select count(*) on one of the tables. > > The select just stops. ps shows this: > > postgres 5987 0.0 0.4 19180 4188 ? S 15:16 0:00 postgres: postgres testdb 192.168.1.111(33598) SELECT waiting > > A query of blocking locks shows this: > > object | trans | pid | mode | blocker > ---------------------------+-------+------+---------------------+--------- > testdb.campaign_cost_pk | | 5754 | AccessShareLock | > testdb.csn_log_pk | | 5754 | RowExclusiveLock | > testdb.pg_trigger | | 5754 | AccessShareLock | > testdb.pg_trigger | | 5754 | RowExclusiveLock | > testdb.sl_subscribe | | 5754 | AccessShareLock | > testdb.csn_log_idx2 | | 5754 | RowExclusiveLock | > testdb.campaign | | 5754 | AccessShareLock | > testdb.campaign | | 5754 | RowExclusiveLock | > testdb.campaign | | 5754 | AccessExclusiveLock | > testdb.pg_rewrite | | 5754 | AccessShareLock | > testdb.pg_rewrite | | 5754 | RowExclusiveLock | > testdb.computer_sn_log | | 5754 | AccessShareLock | > testdb.computer_sn_log | | 5754 | RowExclusiveLock | > testdb.computer_sn_log | | 5754 | AccessExclusiveLock | > testdb.address_type_pk | | 5754 | AccessShareLock | > testdb.campaign_pk | | 5754 | AccessShareLock | > testdb.sl_log_1 | | 5754 | AccessShareLock | > testdb.sl_log_1 | | 5754 | RowExclusiveLock | > testdb.csn_cookie_idx1 | | 5754 | AccessShareLock | > testdb.pg_index | | 5754 | AccessShareLock | > testdb.pg_index | | 5754 | RowShareLock | > testdb.csn_log_idx3 | | 5754 | RowExclusiveLock | > testdb.csn_cookie_pk | | 5754 | AccessShareLock | > testdb.sl_log_2 | | 5754 | AccessShareLock | > testdb.sl_log_2 | | 5754 | RowExclusiveLock | > testdb.sl_set | | 5754 | AccessShareLock | > testdb.sl_set | | 5754 | RowShareLock | > testdb.campaign_cost | | 5754 | AccessShareLock | > testdb.campaign_cost | | 5754 | RowExclusiveLock | > testdb.campaign_cost | | 5754 | AccessExclusiveLock | > testdb.sl_table | | 5754 | AccessShareLock | > testdb.sl_table | | 5754 | RowShareLock | > testdb.sl_table | | 5754 | RowExclusiveLock | > | 9182 | 5754 | ExclusiveLock | > testdb.computer_sn_cookie | | 5754 | AccessShareLock | > testdb.computer_sn_cookie | | 5754 | RowExclusiveLock | > testdb.computer_sn_cookie | | 5754 | AccessExclusiveLock | > testdb.pg_attribute | | 5754 | AccessShareLock | > testdb.sl_config_lock | | 5754 | AccessExclusiveLock | > testdb.sl_trigger | | 5754 | AccessShareLock | > testdb.csn_pk | | 5754 | AccessShareLock | > testdb.pg_class | | 5754 | AccessShareLock | > testdb.pg_class | | 5754 | RowShareLock | > testdb.pg_class | | 5754 | RowExclusiveLock | > testdb.address_type | | 5754 | AccessShareLock | > testdb.address_type | | 5754 | RowExclusiveLock | > testdb.address_type | | 5754 | AccessExclusiveLock | > testdb.pg_namespace | | 5754 | AccessShareLock | > testdb.pg_namespace | | 5754 | RowShareLock | > testdb.csn_log_idx1 | | 5754 | RowExclusiveLock | > testdb.computer_sn | | 5754 | AccessShareLock | > testdb.computer_sn | | 5754 | RowExclusiveLock | > testdb.computer_sn | | 5754 | AccessExclusiveLock | > testdb.address_type | | 5987 | AccessShareLock | 5754 > | 9422 | 5987 | ExclusiveLock | 5754 > (55 rows) > > All responses will be welcomed. > > __ > Marc -- Your PostgreSQL solutions provider, Command Prompt, Inc. 24x7 support - 1.800.492.2240, programming, and consulting Home of PostgreSQL Replicator, plPHP, plPerlNG and pgPHPToolkit http://www.commandprompt.com / http://www.postgresql.org
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