修改一个表的字段类型(如表people中的fname字段把varchar(30)改为varchar(28))
[db2inst1@localhost ~]$ db2 describe table people
[db2inst1@localhost ~]$ db2 "alter table people alter column fname set data type varchar(28)"
[db2inst1@localhost ~]$ db2 "alter table people add notes varchar(100)"
显示当前数据库连接有哪些应用程序
[iyunv@localhost ~]# su - db2inst1
[db2inst1@localhost DB2]$ db2 list application
导出表中的数据
以DEL格式导出
db2 "export to teacher.txt of del select * from teacher"
db2 "export to teacher_bak.txt of del modified by coldel| select * from teacher"
[db2inst1@localhost ~]$ ls
db2inst1 sqllib Sunrier teacher.sql TEST.0.db2inst1.NODE0000.CATN0000.20120817103306.001
[db2inst1@localhost ~]$ db2 "export to teacher.txt of del select * from teacher"
SQL3104N The Export utility is beginning to export data to file
"teacher.txt".
备份数据库(如防止表误操作)
格式:db2 backup db <database name> [ to <dir name> ]
[db2inst1@localhost ~]$ db2 backup db test
SQL3105N The Export utility has finished exporting "2" rows.
恢复数据库(如将一个表删除后,通过删除前的备份文件恢复)
格式:db2 restore db <database name> [ from <dir name> ]
database name:表示恢复的数据库名
from <dir name>:表示为从哪个目录路径下恢复,为可选项,默认在当前目录下
[db2inst1@localhost ~]$ db2 connect to test
注:如果想把恢复的数据库更改为新的数据库名,则格式如下
db2 restore db <database name> [ from <dir name> into <new database name> ]
例:db2 restore db test from /home/db2inst1/Sunrier into testdb
或者db2 restore db test from "/home/db2inst1/Sunrier" into testdb
.查看test数据库备份的历史记录
格式:db2 list history backup all for <database name>
[db2inst1@localhost ~]$ db2 list history backup all for test
查看错误码信息
[db2inst1@localhost ~]$ db2 ? 22003
SQLSTATE 22003: A numeric value is out of range.
======================================back up ========================================
db2 list db directory
1、离线全备份
db2 force application all
1)、首先确保没有用户使用DB2:
db2 list applications for db sample
2)、停掉数据库并重新启动,以便断掉所有连接:
db2stop force
db2start
3)、执行备份命令:(使用TSM作为备份的介质)
db2 backup db sample use tsm
备份成功,将会返回一个时间戳。
4)、检查备份成功:
db2 list history backup all for sample 可以看到多了这个备份的纪录。
db2adutl query 命令也可以看到返回值。
5、恢复数据库
db2 restore db GLANCE from /var/wenbin/backup
当恢复后需要连接数据库的时候报错
Last login: Wed Jan 30 02:23:23 2013
[iyunv@localhost ~]# su - db2inst1
[db2inst1@localhost ~]$ db2 connect to sample
SQL1117N A connection to or activation of database "SAMPLE" cannot be made
because of ROLL-FORWARD PENDING. SQLSTATE=57019
####这个提示是说需要前滚期间的日志才能激活数据库
执行下面的语句:
db2 rollforward db GLANCE to end of logs and stop
1.启动数据库
db2start
2.停止数据库
db2stop
3.连接数据库
db2 connect to o_yd user db2 using pwd
4.读数据库管理程序配置
db2 get dbm cfg
5.写数据库管理程序配置
db2 update dbm cfg using 参数名 参数值
6.读数据库的配置
db2 connect to o_yd user db2 using pwd
db2 get db cfg for o_yd
7.写数据库的配置
db2 connect to o_yd user db2 using pwd
db2 update db cfg for o_yd using 参数名 参数值
8.关闭所有应用连接
db2 force application all
db2 force application ID1,ID2,,,Idn MODE ASYNC
(db2 list application for db o_yd show detail)
9.备份数据库
db2 force application all
db2 backup db o_yd to d:
(db2 initialize tape on \\.\tape0)
(db2 rewind tape on \\.\tape0)
db2 backup db o_yd to \\.\tape0
10.恢复数据库
db2 restore db o_yd from d: to d:
db2 restore db o_yd from \\.\tape0 to d:
11.绑定存储过程
db2 connect to o_yd user db2 using pwd
db2 bind c:\dfplus.bnd
拷贝存储过程到服务器上的C:\sqllib\function目录中
12.整理表
db2 connect to o_yd user db2 using pwd
db2 reorg table ydd
db2 runstats on table ydd with distribution and indexes all
13.导出表数据
db2 export to c:\dftz.txt of del select * from dftz
db2 export to c:\dftz.ixf of ixf select * from dftz
14.导入表数据
import from c:\123.txt of del insert into ylbx.czyxx
db2 import to c:\dftz.txt of del commitcount 5000 messages c:\dftz.msg insert into dftz
import from vipmobiles.txt of del method p(1) insert into tgzvipmobiles(mobileno)
db2 import to c:\dftz.ixf of ixf commitcount 5000 messages c:\dftz.msg insert into dftz
db2 import to c:\dftz.ixf of ixf commitcount 5000 insert into dftz
db2 import to c:\dftz.ixf of ixf commitcount 5000 insert_update into dftz
db2 import to c:\dftz.ixf of ixf commitcount 5000 replace into dftz
db2 import to c:\dftz.ixf of ixf commitcount 5000 create into dftz (仅IXF)
db2 import to c:\dftz.ixf of ixf commitcount 5000 replace_create into dftz (仅IXF)
15.执行一个批处理文件
db2 –tf 批处理文件名
(文件中每一条命令用 ;结束)
16.自动生成批处理文件
建文本文件:temp.sql
select ‘runstats on table DB2.’ || tabname || ‘ with distribution and detailed indexes all;’ from syscat.tables where tabschema=’DB2′ and type=’T';
db2 –tf temp.sql>runstats.sql
17.自动生成建表(视图)语句
在服务器上:C:\sqllib\misc目录中
db2 connect to o_yd user db2 using pwd
db2look –d o_yd –u db2 –e –p –c c:\o_yd.txt
18.其他命令
grant dbadm on database to user bb
19 select * from czyxx fetch first 1 rows only
20 db2look –d ylbx –u db2admin –w –asd –a –e –o a.txt21. 显示当前用户所有表
list tables
22.列出所有的系统表
list tables for system
23.查看表结构
db2 describe select * from user.tab