Excess PGA memory used by hash joins [bug 5947623]
[@more@]it is possible for a query to allocate too much memory executing a hash join over large volumes of data with few distinct join key values. The impact on 64-bit systems is greater. This is not really a memory leak as the fix only makes the query to spill to disk earlier. Workaround: set "_pga_max_size"
我们的系统是11.1.0.7 受此bug影响,设置了_pga_max_size 1600M
但pga in use仍会涨到30多G,不知算不算多.
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/94384/viewspace-1028629/ ，如需转载，请注明出处，否则将追究法律责任。
请登录后发表评论
登录
全部评论
最新文章
- Windows WMIC命令详解 (Windows Management Instrumentation Command-line)
- 为monitor打PSU4 (10.2.0.4.4)的步骤
- 重建控制文件 recreate control file
- 停库前执行alter system checkpoint 很重要!
- 参加oracle 数据中心优化高峰会
- 用RMAN迁移文件到ASM或从ASM迁出
- 常用sql
- 分区操作常用sql
- How to Get a 10046 trace for a Parallel Query [ID 1102801.1]
- Master Note Parallel Execution Wait Events [ID 1097154.1]
