postgresql 致命錯誤: 已保留的串連位置為執行非複製請求的超級使用者預留，postgresql超級使用者

postgresql 致命錯誤: 已保留的串連位置為執行非複製請求的超級使用者預留，postgresql超級使用者

最近監控系統的資料庫監控總是延遲，查看日誌報錯：

2015-08-27 10:20:19,534 ERROR Traceback (most recent call last):  File "oracle_mon.py", line 306, in <module>    update_status(ip, 'stop', timer.end_date)  File "oracle_mon.py", line 285, in update_status    pg.db.update("oracle_mon", where=where, status=status, stat_date=status_date)  File "/usr/lib/python2.7/site-packages/web/db.py", line 881, in update    db_cursor = self._db_cursor()  File "/usr/lib/python2.7/site-packages/web/db.py", line 566, in _db_cursor    return self.ctx.db.cursor()  File "/usr/lib/python2.7/site-packages/web/db.py", line 507, in _getctx    self._load_context(self._ctx)  File "/usr/lib/python2.7/site-packages/web/db.py", line 516, in _load_context    ctx.db = self._connect_with_pooling(self.keywords)  File "/usr/lib/python2.7/site-packages/web/db.py", line 970, in _connect_with_pooling    conn = DB._connect_with_pooling(self, keywords)  File "/usr/lib/python2.7/site-packages/web/db.py", line 563, in _connect_with_pooling    return self._pooleddb.connection()  File "/usr/lib/python2.7/site-packages/DBUtils-1.1-py2.7.egg/DBUtils/PooledDB.py", line 331, in connection    con = self.steady_connection()  File "/usr/lib/python2.7/site-packages/DBUtils-1.1-py2.7.egg/DBUtils/PooledDB.py", line 279, in steady_connection    *self._args, **self._kwargs)  File "/usr/lib/python2.7/site-packages/DBUtils-1.1-py2.7.egg/DBUtils/SteadyDB.py", line 134, in connect    failures, ping, closeable, *args, **kwargs)  File "/usr/lib/python2.7/site-packages/DBUtils-1.1-py2.7.egg/DBUtils/SteadyDB.py", line 186, in __init__    self._store(self._create())  File "/usr/lib/python2.7/site-packages/DBUtils-1.1-py2.7.egg/DBUtils/SteadyDB.py", line 190, in _create    con = self._creator(*self._args, **self._kwargs)  File "/usr/lib64/python2.7/site-packages/psycopg2/__init__.py", line 179, in connect    connection_factory=connection_factory, async=async)OperationalError: 致命錯誤:  已保留的串連位置為執行非複製請求的超級使用者預留

查到資料庫使用的活動串連數為90左右，而pg的預設最大串連數MAX_CONNECTION=100，懷疑是資料庫連接數過多導致報錯。

事實果然如此，老資料庫的MAX_CONNECTION=200，並沒有使用預設的100。

解決辦法：修改設定檔（postgresql.conf）中的預設最大串連數MAX_CONNECTION=200，重啟資料庫即可。

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