Linux下学习DB2命令的笔记
Linux下学习DB2命令的笔记
本笔记接在上一篇 <<Linux下安装DB2数据库步骤>> ,学习过程中使用下载的官网DB2数据库(免费版本)测试的,由于工作中DB2是用在项目中的,而且是收费的数据库,故我只在项目编程中使用它(即公司的DB2数据库收费版本),没用来作为自己测试用。嘿嘿,所以下面的大部分操作主要来自下载的官网DB2数据库(免费版本)。
相关阅读：Linux下卸载DB2数据库步骤
DB2相关数据库命令
1.数据库实例的启动
首先要启动数据库的实例,即切换到db2inst1用户(注:db2inst1用户为当前数据库的实例),然后执行db2start启动数据库的实例
[root@localhost instance]# su - db2inst1
[db2inst1@localhost ~]$ db2start
SQL1063N DB2START processing was successful.
[db2inst1@localhost ~]$
2.数据库实例的关闭
首先在db2inst1用户下强制关闭实例上的所有应用程序,然后再关闭数据库实例
[db2inst1@localhost ~]$ db2 force application all
DB20000I The FORCE APPLICATION command completed successfully.
DB21024I This command is asynchronous and may not be effective immediately.
[db2inst1@localhost ~]$ db2stop
SQL1064N DB2STOP processing was successful.
[db2inst1@localhost ~]$
强制停止
[db2inst1@localhost DB2]$ db2stop force
SQL1064N DB2STOP processing was successful.
[db2inst1@localhost DB2]$
3.显示所有的实例
[db2inst1@localhost ~]$ db2ilist
db2inst1
[db2inst1@localhost ~]$
4.显示当前的实例
[db2inst1@localhost ~]$ db2 get instance
The current database manager instance is: db2inst1
[db2inst1@localhost ~]$
5.删除一个实例(注:需切换到root用户权限下)
[root@localhost ~]# cd /opt/ibm/db2/V9.7/instance
[root@localhost instance]# pwd
/opt/ibm/db2/V9.7/instance
[root@localhost instance]# ./db2idrop db2inst1
DBI1070I Program db2idrop completed successfully.
[root@localhost instance]#
6.列出当前实例中有哪些数据库
[root@localhost instance]# su - db2inst1
[db2inst1@localhost ~]$ db2 list db directory
SQL1031N The database directory cannot be found on the indicated file system.
SQLSTATE=58031
[db2inst1@localhost ~]$
注:上面信息说明实例中没有数据库
7.创建数据库
[root@localhost instance]# su - db2inst1
[db2inst1@localhost ~]$ db2 create database test
SQL1032N No start database manager command was issued. SQLSTATE=57019
[db2inst1@localhost ~]$
[db2inst1@localhost ~]$ db2start
SQL5043N Support for one or more communications protocols failed to start successfully. However, core database manager functionality started successfully.
[db2inst1@localhost ~]$ db2 create database test
DB20000I The CREATE DATABASE command completed successfully.
[db2inst1@localhost ~]$ db2 list db directory
System Database Directory
Number of entries in the directory = 1
Database 1 entry:
Database alias = TEST
Database name = TEST
Local database directory = /home/db2inst1
Database release level = d.00
Comment =
Directory entry type = Indirect
Catalog database partition number = 0
Alternate server hostname =
Alternate server port number =
[db2inst1@localhost ~]$
注:上面通过创建一个test的数据库,并说明了创建数据库时,要先启动数据库,然后创建数据库test成功后并列出了当前实例中的所有数据库,只存在数据库test
8.连接数据库
[db2inst1@localhost ~]$ db2 connect to test
Database Connection Information
Database server = DB2/LINUX 9.7.1
SQL authorization ID = DB2INST1
Local database alias = TEST
[db2inst1@localhost ~]$
注:用密码情况下格式[db2inst1@localhost ~]$ db2 connect to test user username using password
db2 connect to <database> user <username> using <password>
9.查看表的空间
[db2inst1@localhost ~]$ db2 list tablespaces [ show detail ]
Tablespaces for Current Database
Tablespace ID = 0
Name = SYSCATSPACE
Type = Database managed space
Contents = All permanent data. Regular table space.
State = 0x0000
Detailed explanation:
Normal
Tablespace ID = 1
Name = TEMPSPACE1
Type = System managed space
Contents = System Temporary data
State = 0x0000
Detailed explanation:
Normal
Tablespace ID = 2
Name = USERSPACE1
Type = Database managed space
Contents = All permanent data. Large table space.
State = 0x0000
Detailed explanation:
Normal
[db2inst1@localhost ~]$
注: show detail为可选项,显示更详细信息
或者 db2pd -tablespaces -db 数据库名
[db2inst1@localhost ~]$ db2pd -tablespaces -db test
Database Partition 0 -- Database TEST -- Active -- Up 0 days 00:03:11
Tablespace Configuration:
Address Id Type Content PageSz ExtentSz Auto Prefetch BufID BufIDDisk FSC NumCntrs MaxStripe LastConsecPg Name
0x9DC2A060 0 DMS Regular 4096 4 Yes 4 1 1 Off 1 0 3 SYSCATSPACE
0x9DC2B4B0 1 SMS SysTmp 4096 32 Yes 32 1 1 On 1 0 31 TEMPSPACE1
0x9DC30940 2 DMS Large 4096 32 Yes 32 1 1 Off 1 0 31 USERSPACE1
Tablespace Statistics:
Address Id TotalPgs UsablePgs UsedPgs PndFreePgs FreePgs HWM Max HWM State MinRecTime NQuiescers PathsDropped
0x9DC2A060 0 24576 24572 18712 0 5860 18712 18712 0x00000000 0 0 No
0x9DC2B4B0 1 1 1 1 0 0 0 0 0x00000000 0 0 No
0x9DC30940 2 8192 8160 96 0 8064 96 96 0x00000000 0 0 No
Tablespace Autoresize Statistics:
Address Id AS AR InitSize IncSize IIP MaxSize LastResize LRF
0x9DC2A060 0 Yes Yes 33554432 -1 No None None No
0x9DC2B4B0 1 Yes No 0 0 No 0 None No
0x9DC30940 2 Yes Yes 33554432 -1 No None None No
Containers:
Address TspId ContainNum Type TotalPgs UseablePgs PathID StripeSet Container
0x9B218F00 0 0 File 24576 24572 0 0 /home/db2inst1/db2inst1/NODE0000/TEST/T0000000/C0000000.CAT
0x9B219120 1 0 Path 1 1 0 0 /home/db2inst1/db2inst1/NODE0000/TEST/T0000001/C0000000.TMP
0x9B219390 2 0 File 8192 8160 0 0 /home/db2inst1/db2inst1/NODE0000/TEST/T0000002/C0000000.LRG
[db2inst1@localhost ~]$
10.显示数据库里有哪些表
[db2inst1@localhost ~]$ db2 connect to test
Database Connection Information
Database server = DB2/LINUX 9.7.1
SQL authorization ID = DB2INST1
Local database alias = TEST
[db2inst1@localhost ~]$ db2 list tables
Table/View Schema Type Creation time
------------------------------- --------------- ----- --------------------------
0 record(s) selected.
[db2inst1@localhost ~]$
注:上面信息说明数据库test中还没有表
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