Hi there,
We started seeing 1000s of messages like the ones below in our logs starting last night. There's been no changes but performance has dropped significantly.
It's Postgres 9.2.3
2013-05-19 12:50:30.423 UTC,,,1976,,5198ca96.7b8,1,,2013-05-19 12:50:30 UTC,8/0,0,DEBUG,00000,"autovacuum: processing database ""dddd_production""",,,,,,,,,""
2013-05-19 12:50:30.434 UTC,,,1976,,5198ca96.7b8,2,,2013-05-19 12:50:30 UTC,8/159746,1173975322,DEBUG,00000,"transaction ID wrap limit is 2297797644, limited by database with OID 17671",,,,,,,,,""