owncloud 引起 postgresql cpu100%

使用的好好的 owncloud 突然不能登录了，并且服务器其他东西也变得狂慢。

在服务器上看了一下，每一个 owncloud 有关的 postgres 进程都几乎 cpu 100%。

我不太懂数据库。。当初是按着 owncloud 的说明一步一步配的。

在日志里看，只要有连接访问 owncloud，就会有大量大量大量下面这样的 log：

Dec 22 15:13:07 xxx postgres[15124]: DETAIL:  parameters: $1 = '72431', $2 = '1'
Dec 22 15:13:07 xxx postgres[15124]: LOG:  execute <unnamed>: SELECT "path" FROM "oc_filecache" WHERE "fileid" = $1 AND "storage" = $2
Dec 22 15:13:07 xxx postgres[15124]: DETAIL:  parameters: $1 = '72431', $2 = '1'
Dec 22 15:13:07 xxx postgres[15124]: LOG:  duration: 0.019 ms
Dec 22 15:13:07 xxx postgres[15124]: LOG:  duration: 0.037 ms  parse <unnamed>: SELECT "path" FROM "oc_filecache" WHERE "fileid" = $1 AND "storage" = $2
Dec 22 15:13:07 xxx postgres[15124]: LOG:  duration: 0.076 ms  bind <unnamed>: SELECT "path" FROM "oc_filecache" WHERE "fileid" = $1 AND "storage" = $2
Dec 22 15:13:07 xxx postgres[15124]: DETAIL:  parameters: $1 = '72431', $2 = '1'
Dec 22 15:13:07 xxx postgres[15124]: LOG:  execute <unnamed>: SELECT "path" FROM "oc_filecache" WHERE "fileid" = $1 AND "storage" = $2
Dec 22 15:13:07 xxx postgres[15124]: DETAIL:  parameters: $1 = '72431', $2 = '1'
Dec 22 15:13:07 xxx postgres[15124]: LOG:  duration: 0.031 ms
Dec 22 15:13:07 xxx postgres[15124]: LOG:  duration: 0.038 ms  parse <unnamed>: SELECT "path" FROM "oc_filecache" WHERE "fileid" = $1 AND "storage" = $2
Dec 22 15:13:07 xxx postgres[15124]: LOG:  duration: 0.074 ms  bind <unnamed>: SELECT "path" FROM "oc_filecache" WHERE "fileid" = $1 AND "storage" = $2
Dec 22 15:13:07 xxx postgres[15124]: DETAIL:  parameters: $1 = '72431', $2 = '1'
Dec 22 15:13:07 xxx postgres[15124]: LOG:  execute <unnamed>: SELECT "path" FROM "oc_filecache" WHERE "fileid" = $1 AND "storage" = $2
Dec 22 15:13:07 xxx postgres[15124]: DETAIL:  parameters: $1 = '72431', $2 = '1'
Dec 22 15:13:07 xxx postgres[15124]: LOG:  duration: 0.019 ms
Dec 22 15:13:07 xxx postgres[15124]: LOG:  duration: 0.038 ms  parse <unnamed>: SELECT "path" FROM "oc_filecache" WHERE "fileid" = $1 AND "storage" = $2
Dec 22 15:13:07 xxx postgres[15124]: LOG:  duration: 0.076 ms  bind <unnamed>: SELECT "path" FROM "oc_filecache" WHERE "fileid" = $1 AND "storage" = $2

请问有人能看出点思路么？大概啥出问题了啊？