The following statements sometimes require the use of a temporary segment:
■ CREATE INDEX
■ SELECT ... ORDER BY
■ SELECT DISTINCT ...
■ SELECT ... GROUP BY
■ SELECT . . . UNION
■ SELECT ... INTERSECT
■ SELECT ... MINUS
Some unindexed joins and correlated subqueries can require use of a temporary
segment. For example, if a query contains a DISTINCT clause, a GROUP BY, and an
ORDER BY, Oracle can require as many as two temporary segments.
1. 以上7种情况可能用到临时段
2. Oracle一条SQL最多可以申请两个临时段.
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/10599713/viewspace-968972/ ，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
-
博文量740
-
访问量2002851
最新文章
- 人力&人手&人才&人物
- oracle树中prior的用法
- Using Supplied Packages to Manage Stored Outlines
- $ORACLE_HOMERDBMSADMIN目录下各SQL的含义
- PRODUCT_USER_PROFILE Table
- Backing Up Server Parameter Files with RMAN
- Backing Up Control Files with RMAN
- Backing Up Individual Tablespaces with RMAN
- Making Whole Database Backups with RMAN
- 目睹奥运火炬传递
