http://system3support.jp/pdf/oracle_knowledge/immediate_fight/p425.pdf WebMay 25, 2015 · 3つの待機イベントdb file sequential read / db file scattered read / direct path readが発生する処理の違いと、それを示す幾つかの統計情報が理解出来た今、99.00%というバッファ・キャッシュヒット率が高いのか、低いのかを改めて評価してみま …
从 12.1 迁移到 12.2 后 SQL 语句执行缓慢等待在"PGA …
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性能优化之等待事件direct path read的解决方法 - 墨天轮
WebThe session is waiting for a direct read to complete. A direct read is a physical I/O from a data file that bypasses the buffer cache and reads the data block directly into process-private memory. If asynchronous I/O is supported (and in use), then Oracle can submit I/O requests and continue processing. Oracle can then pick up the results of ... WebAug 11, 2024 · Oracle direct path read相关隐含参数. In 10g, serial table scans for "large" tables go through the buffer cache (by default). In 11g or higher, there has a been a change in the rules that choose between using 'direct path reads' and reads through the buffer cache for serial (i.e. non-parallel) table scans. This decision is based on the ... WebFeb 14, 2012 · direct path read temp →一時ファイルに対するreadディスクソートが行われたときに発生する待機イベント。 大きなデータのソートなどを行うときにはtemp領域を使用するので、不要なソートの見直し … centos networkmanager config