18And when He got into the boat,he who had been demon-possessed begged Him that he might be with Him.19However, Jesus did not permit him, but said to him,“Go home to your friends, and tell them what great things the Lord has done for you, and how He has had compassion on you...
Explain可以用来迅速方便地查出对于给定SQL语句中的查询数据是如何得到的即搜索路径(我们通常称为Access Path)。从而使我们选择最优的查询方式达到最大的优化效果。 1.1 、安装 要使用EXPLAIN首先要执行相应的脚本,创建出Explain_plan表。 具体脚本执行如下: $ORACLE_HOME/rdbms/admin/utlxplan.sql (UNIX) 该脚本后会...