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oracle mysql odi exem oracle deep internal postgresql page dump postgres block cleanout performance degradation undo delayed block cleanout page undo page max_length max_cr_dba internal aurora amazon web services amazon ingres mvcc fsm dump frozenbit performance tuning sqlid sql address v$session sql library cache 鞐戩厛 full vacuum pg 靹彪姤鞝赌顷� 鞓る澕韥� pgday 敫旊�� 韥措Π鞎勳泝 max length t_xmin db block max cr dba pg9.4 undo record update freeze t_xmax infomask2 p_s wait event performance schema benchmark database clog pdi cmin infomask undo record chaining update statement monitoring server monitoring rollback segment parameter roll pointer lock autovacuum xid wraparound hint vacuum xmax ctid xmin statistic vm