Hi,
Recently, in our Production server, we found a "single query" being held up
in "<IDLE> in transaction" for more than 19 hours using the following query:
select date_trunc('second', current_timestamp - query_start) as runtime,
datname as database_name, current_query from pg_stat_activity where
current_query != '<IDLE>' order by 1 desc
but we're clueless which was the root cause of this issue and still hunting.
As we know, query output doesn't show up the actual query/statement.
We then ran the 3rd query available from PostgreSQL Wiki - Lock Monitoring
http://wiki.postgresql.org/wiki/Lock_Monitoring From query result output, I
could infer only the following but still not able to find out the real root
cause:
1) 2 tables are involved (table1 and table2)
2) Mostly table1's indexes are appearing in the output.
Pasted below result output containing only "<IDLE> in transaction". For
security reasons, I've masked/renamed table names and index names in
"relname" column. Though all index names are renamed to as
"table1_xxxxx_indx", all are different index names and not the same index.
Yes, we do have more than 30 indexes in table1.
Can somebody help me out what is going wrong/causing these "<IDLE> in
transaction"?
datname | relname | transactionid | mode |
granted | usename | substr | query_start
| age | procpid
---------+-------------------------------+---------------+-----------------+
---------+---------+--------------------------------+-----------------------
--------+------------------+---------
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table2 | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_pk | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_idx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx_indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx__indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1 | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | | 668748028 | ExclusiveLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx__indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
prodndb | table1_xxxxx__indx | | AccessShareLock |
t | dbuser | <IDLE> in transaction | 2012-05-01
14:56:53.617912-04 | 19:20:59.644261 | 14740
But no rows were returned for the 2nd query available in PostgreSQL Wiki -
Lock Monitoring.
We're running PostgreSQL v8.2.22 and pgpool v3.1.1 (only connection pooling
feature is used).
Regards,
Gnanam
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