11g对Nested Loops的改进
11g官档9 JoinsCurrent Implementation for Nested Loops JoinsOracle Database 11g introduced a new implementation for nested loops that reduces overall latency for physical I/O. When an index or a tab
oracle左连接和相关执行计划实验
版本11.2.0.4set linesize 170set pagesize 200col file_name for a60此脚本解决tom脚本调用DBA_FREE_SPACE,无法显示已经写满的数据文件的问题。select a.file_id "file_id",a.file_name "file_name",(a.bytes/1048576)