set echo off
————————————————–
— @name: lock_internal
— @author: dion cho
— @description: my own version of dba_lock_internal
—————————————————
define __SID = “&1”
define __NAME = “&2”
col handle format a10
col type[……]
February 10, 2012 Internals, oracle No comments scripts
set echo off
————————————————–
— @name: lock_internal
— @author: dion cho
— @description: my own version of dba_lock_internal
—————————————————
define __SID = “&1”
define __NAME = “&2”
col handle format a10
col type[……]
February 9, 2012 migration, oracle, replication No comments dataguard
记录一次database upgrade 导致physical standby故障
upgrade from 10.2.0.5->11.2.0.3
单节点的database升级很容易，严格按照手册，修改compatible=10.2.0
参考文档 Complete Checklist for Manual Upgrades to 11gR2 [ID 837570.1]
如果带有standby的系统升级要注意以下几点：
1.首先stop 10g listener,使用 11g listener
2.使用11g software打开standby databa[……]
Recommendation for the Real Application Cluster Interconnect and Jumbo Frames
Applies to:
Oracle Server – Enterprise Edition – Version: 9.2.0.1 to 11.2.0.0 – Release: 9.2 to 11.2
Information in this document applies to any platform.
Oracle Server Enterprise Edition – Version: 9.2.0.1 to[……]
February 3, 2012 11g, oracle No comments 11g new feature
在pythian看到了一个测试，是否证明了oracle 11g is x% faster than 10g?(oracle官方的说法）
First, you have to create and fill a table to run your query :
create table gark
(id1 number not null,
id2 number not null,
id3 number not null);
begin
for i in 1..100000 loop
insert into gark(id1, id2, id3)[……]
February 3, 2012 11g, oracle No comments 11g new feature
总结了11g partition new feature
11G Introduced partition extensions:
-Interval partitioning
-REF partitioning
-More Composite Partitioning
-Virtual Column-based partitioning
-System Partitioning
-Introduced Partition Advisor.
Partition Types
Let us discuss each of the above features briefl[……]
January 18, 2012 maintain, MYSQL No comments mysql
由于此前的mysql salve服务器没有进行规划,一些参数都是使用的默认参数,导致innodb datafile 无限制增长,所以需要重新规划一下datafile空间的分配,以及其他参数的优化
version:
mysql>
mysql>
mysql> select version()
-> ;
+————+
| version() |
+————+
| 5.5.14-log |
+————+
1 row in set (0.02 sec)
mysql>
配置sysctl limit
[roo[……]
January 16, 2012 linux, system 5 comments structure
Regular Pages and HugePages
This section aims to give a general picture about memory access in virtual memory systems and how pages are referenced.
When a single process works with a piece of memory, the pages that the process uses are reference in a local page table for the specific process. T[……]
January 16, 2012 maintain, oracle No comments scripts
修改过的show_space 支持ASSM
create or replace
procedure show_space
( p_segname_1 in varchar2,
p_space in varchar2 default ‘MANUAL’,
p_type_1 in varchar2 default ‘TABLE’ ,
p_freespace in varchar2 default ‘N’,
p_owner_1 in varchar2 default user)
as
p_segname varc[……]
January 13, 2012 Internals, oracle No comments structure
NOLOGGING is supported in only a subset of the locations that support LOGGING. Only the following operations support the NOLOGGING mode:
DML:
1. Direct-path INSERT (serial or parallel) resulting either from an INSERT or a
MERGE statement. NOLOGGING is not applicable to any UPDATE operations
resu[……]
January 11, 2012 oracle, replication, system No comments dataguard
今天遇到一个奇怪的问题，3个logic standby 中有一个delay 查看任何日志都没有发现错误，有一个transaction在apply一个SQL，这条SQL没有任何问题，SQL所涉及到的表也没有任何问题
当时的apply情况如下：
SID USERNAME MACHINE EVENT PARAM W WT SQL ST LT LOGON_TIME
—— ———- —[……]