9. Working sets _db_block_lru_latches 缺省值为 DBWR 进程的数量 ×8 (允许的最大的 buffer pool 数量)
10.
11.
12.
13.
14.
15.
16.
17. CKPTQ & FQ Pre-Oracle8 DBWR scanned the entire cache to find buffers with checkpoint bit set. CKPTQ and FQs eliminate this scan. – When the buffer is first modified, it is inserted into the CKPTQ in RBA order – The buffer is also inserted into the appropriate FQ When a checkpoint is initiated, DBWR writes all buffers on the queue until the checkpoint RBA is less than the head of the CKPTQ RBA. 全量检查点发生条件: 发出命令: alter system checkpoint ; 除了 shutdown abort 以外的正常关闭数据库。