Oracl 12c启用了PDB.CDB模式 1.orcl不能创建用户 使用pdborcl登录,这个才是以前11g的orcl数据库的概念 2.pdborcl库不自动启动 alter pluggable database pdborcl save state instances=all; 执行就可以了(使用sysdba登录执行) 小惊喜 sqlplus直接登录sysdba失败,使用sqlplus sys as sysdba登录 原文地址:https://blog.51cto.com/zl0828/2
监控SQL 1.监控事例的等待: select event,sum(decode(wait_time,0,0,1)) prev, sum(decode(wait_time,0,1,0)) curr,count(*) from v$session_wait group by event order by 4; 2.回滚段的争用情况: select name,waits,gets,waits/gets ratio from v$rollstat a,v$rollname b where a.usn=