改嘛 改嘛

应用服务器telnet 端口 过去能通不嘛

应该尝试确定SQL中执行大量缓冲区获取和执行计划的语句，这些SQL中含有read by other session等待对应扫描的对象，通常这种执行时间都蛮长的，还要综合db file scattered read、db file sequential read相关的等待SQL去排查。

是啊，要先解决主要矛盾，次要冲突合理规划

If the table is partitioned, then there would be DataPump Worker processes active (where is the value of the parallel parameter), each unloading data from one of the table partitions.Include a where

你应该进入到impdp里面，看看当前卡在那一步对象上。

DBLINK + MERGE INTO

SOLUTIONEither:Create the link with no quotes around the username/password so that the credentials are interpreted in uppercase.SQL> create database link TARGET_DB CONNECT TO IDENTIFIED BY USING ‘TA

How to monitor Undo Tablespace Usage and the Free Space (Doc ID 1951400.1)The Undo Space once allocated wont be deallocated to the OS, by default. But the space can be reused by other transactions onc

delete来处理你就不要想了，我觉得搞不出来，换个思维方式吧

nslookup fails for normal users with error : connection timed out (Doc ID 1667077.1)

这是12c中引入的，对hash算法进行了更改以适应PDB。Global Transaction Identifier hash collision risk with very similar Global Transaction ID (Doc ID 2016166.1)Global Transaction Identifier Hash Collision Detected MESSAGE I

不晓得这样可以解决问题不：1).找个非业务时段。2).创建另一个表B。3).将所需保留的数据INSERT(NOLOGGING)到新表B中。4).RENAME原始表A到A_BAK。5).RENAME表B为业务表。