1. DBMS_STATS.GATHER_TABLE_STATS ( ownname VARCHAR2, tabname VARCHAR2, partname VARCHAR2, estimate_percent NUMBER, block_sample BOOLEAN, method_opt VARCHAR2, degree NUMBER, granularity VARCHAR2, cascade BOOLEAN, stattab VARCHAR2, statid VARCHAR2, statown VARCHAR2, no_invalidate BOOLEAN, force BOOLEAN);
eg: exec DBMS_STATS.gather_table_stats(ownname=>'PORTAL_OWNER',
tabname=>'STG_ONBOARDING');
2. V$SESSION
Session信息
SID：SESSION标识，常用于连接其它列
SERIAL#：如果某个SID又被其它的session使用的话则此数值自增加(当一个SESSION结束，另一个SESSION开始并使用了同一个SID)。
AUDSID：审查session ID唯一性，确认它通常也用于当寻找并行查询模式
USERNAME：当前session在oracle中的用户名。
Client信息 数据库session被一个运行在数据库服务器上或从中间服务器甚至桌面通过SQL*Net连接到数据库的客户端进程启动，下列各列提供这个客户端的信息
OSUSER： 客户端操作系统用户名
MACHINE： 客户端执行的机器
TERMINAL：客户端运行的终端
PROCESS： 客户端进程的ID
PROGRAM： 客户端执行的客户端程序
3. V$DATABASE，以获得数据库的创建时间和归档信息
4. V$TEMP_SPACE_HEADER 查看临时表空间temp空闲情况
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