Why are a lot of ROLLBACK queries in idle state

Hi,

When querying the pg_stat_acitivity I find a lot of ROLLBACK queries in idle
state. Can someone help me know why?

Thanks in advance.

select query, state, waiting, query_start from pg_stat_activity where query
ilike '%rollback%';
                                              query
| state  | waiting |          query_start

-------------------------------------------------------------------------------------------------+--------+---------+-------------------------------
 ROLLBACK
| idle   | f       | 2016-11-17 03:02:24.544345+00
 ROLLBACK
| idle   | f       | 2016-11-18 09:32:19.372843+00
 ROLLBACK
| idle   | f       | 2016-11-15 13:31:54.756704+00
 ROLLBACK
| idle   | f       | 2016-11-18 07:08:45.51883+00
 ROLLBACK
| idle   | f       | 2016-11-17 12:41:42.731161+00
 ROLLBACK
| idle   | f       | 2016-11-18 09:32:17.91838+00
 ROLLBACK
| idle   | f       | 2016-11-16 13:20:31.044959+00
 ROLLBACK
| idle   | f       | 2016-11-17 10:42:09.652842+00
 ROLLBACK
| idle   | f       | 2016-11-17 06:43:38.280102+00
 ROLLBACK
| idle   | f       | 2016-11-15 12:48:05.320185+00
 ROLLBACK
| idle   | f       | 2016-11-18 07:35:38.029441+00
 ROLLBACK
| idle   | f       | 2016-11-10 10:28:01.60524+00
 ROLLBACK
| idle   | f       | 2016-11-15 13:57:14.68677+00
 ROLLBACK
| idle   | f       | 2016-11-18 09:33:49.067333+00
 ROLLBACK
| idle   | f       | 2016-11-17 13:10:14.768031+00
 ROLLBACK
| idle   | f       | 2016-11-18 03:18:21.688177+00
 ROLLBACK
| idle   | f       | 2016-11-17 12:41:42.719949+00
 select query, state, waiting, query_start from pg_stat_activity where query
ilike '%rollback%'; | active | f       | 2016-11-18 09:55:05.476337+00
 ROLLBACK
| idle   | f       | 2016-11-18 08:24:59.286648+00
 ROLLBACK
| idle   | f       | 2016-11-17 13:10:14.767571+00
 ROLLBACK
| idle   | f       | 2016-11-18 09:32:19.448064+00
 ROLLBACK
| idle   | f       | 2016-11-15 13:57:14.680491+00
 ROLLBACK
| idle   | f       | 2016-11-11 09:18:26.057973+00
 ROLLBACK
| idle   | f       | 2016-11-15 12:24:52.661909+00
 ROLLBACK
| idle   | f       | 2016-11-11 09:18:26.064561+00
 ROLLBACK
| idle   | f       | 2016-11-18 06:56:57.2566+00
 ROLLBACK
| idle   | f       | 2016-11-11 09:16:21.458585+00
 ROLLBACK
| idle   | f       | 2016-11-16 13:21:02.534579+00




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Thanks,
Rajan.
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