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>> http://www.linuxidc.com/Linux/2012-08/67851.htm ,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   http://www.linuxidc.com/Linux/2012-08/67849.htmDB2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 = 1Database 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test8.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 passworddb2 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 testDatabase Partition 0 -- Database TEST -- Active -- Up 0 days 00:03:11Tablespace 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           USERSPACE1Tablespace 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 tablesTable/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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