Linux下學習DB2命令的筆記

本筆記接在上一篇 <<Linux下安裝DB2資料庫步驟>>   ,學習過程中使用下載的官網DB2資料庫(免費版本)測試的,由於工作中DB2是用在項目中的,而且是收費的資料庫,故我只在項目編程中使用它(即公司的DB2資料庫收費版本),沒用來作為自己測試用。嘿嘿,所以下面的大部分操作主要來自下載的官網DB2資料庫(免費版本)。

相關閱讀：Linux下卸載DB2資料庫步驟  

DB2相關資料庫命令

1.資料庫執行個體的啟動
首先要啟動資料庫的執行個體,即切換到db2inst1使用者(注:db2inst1使用者為當前資料庫的執行個體),然後執行db2start啟動資料庫的執行個體
[root@localhost instance]# su - db2inst1
[db2inst1@localhost ~]$ db2start
SQL1063N  DB2START processing was successful.
[db2inst1@localhost ~]$

2.資料庫執行個體的關閉
首先在db2inst1使用者下強制關閉執行個體上的所有應用程式,然後再關閉資料庫執行個體
[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 ~]$

強制停止
[db2inst1@localhost DB2]$ db2stop force
SQL1064N  DB2STOP processing was successful.
[db2inst1@localhost DB2]$

3.顯示所有的執行個體
[db2inst1@localhost ~]$ db2ilist
db2inst1
[db2inst1@localhost ~]$

4.顯示當前的執行個體
[db2inst1@localhost ~]$ db2 get instance

 The current database manager instance is:  db2inst1

[db2inst1@localhost ~]$

5.刪除一個執行個體(注:需切換到root使用者權限下)
[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.列出當前執行個體中有哪些資料庫
[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:上面資訊說明執行個體中沒有資料庫

7.建立資料庫
[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:上面通過建立一個test的資料庫,並說明了建立資料庫時,要先啟動資料庫,然後建立資料庫test成功後並列出了當前執行個體中的所有資料庫,只存在資料庫test

8.串連資料庫
[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:用密碼情況下格式[db2inst1@localhost ~]$ db2 connect to test user username using password

db2 connect to <database> user <username> using  <password>

9.查看錶的空間
[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為可選項,顯示更詳細資料

或者 db2pd -tablespaces -db 資料庫名
[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.顯示資料庫裡有哪些表
[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:上面資訊說明資料庫test中還沒有表

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