转library cache pin&lock
library cache pin=================原理~~~~~An Oracle instance has a library cache that contains the description of different types of objects e.g. cursors, indexes, tables, views, procedure...
Oracle 高水位(HWM)
Oracle 高水位(HWM) 收藏 1. 准备知识:ORACLE的逻辑存储管理. ORACLE在逻辑存储上分4个粒度:表空间,段,区和块. 1.1 块:是粒度最小的存储单位,现在标准的块大小是8K,ORACLE每一次I/O操作也是...
SET UNUSED COLUMN
SQL> select col#, name, segcol#, intcol# 2 from col$ 3 where obj# in (select object_id 4  ...
收藏What’s the Point of Oracle Checkpoints?
(oracle checkpoint相关的一些重要问题)作者简介: Harald van Breederode (oracle大学高级DBA讲师,拥有25年unix方面的经验和12年oracle相关经验。Oracle 8i,9i,10g,11g ocp。Oracle 10g ocm) 原文是一个英...
藏记offline和offline drop
、对一个datafile执行offline或offline drop本质上是一回事,但对一个datafile执行offline只能在归档模式下;而对一个datafile执行offline drop则既可以在归档模式也可以在非归档模式下; 2、对一个datafile...
explain
Usage: tkprof tracefile outputfile [explain= ] [table= ] [print= ] [insert= ] [sys= ] [sort= ]EXPLAINDetermines the execution plan for each SQL sta...
随记EXP-00008: ORACLE error 6550 encountered
DB is Oracle 10g (10.2.0.4.0) on 64 Bit Windows 2003When i am exporting, i am getting "EXP-00008: ORACLE error 6550 encountered"EXP-00008: ORACLE error 6550 encounteredORA-06550: line 1, column 18:P...
短歌行
撷绿茵之悠然吐纳清新进步江边极目面江之朦茫缅邈天际掀烟青翠过眼鳞沦微波叠如瓴鳞浪层层江边垂钓静只是孤棹凌波行须晴日暝烟熔金残阳如血...
_optimizer_mjc_enabled
SQL> select * from hr.employees,hr.departments,hr.JOBS;已选择54891行。已用时间: 00: 00: 01.32执行计划----------------------------------------------------------Plan hash value: 426370614...
doesn't contain a valid partition table
[root@rac2 ~]# fdisk -lDisk /dev/sda: 8589 MB, 8589934592 bytes255 heads, 63 sectors/track, 1044 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytes Device Boot &n...