DB2常用命令集合

1、 打开命令行窗口

　 #db2cmd

2、 打开控制中心

　 # db2cmd db2cc

3、 打开命令编辑器

　db2cmd db2ce

4、 启动数据库实例

　 #db2start

5、 停止数据库实例

　 #db2stop

6、备份数据库

#db2 backup db

7、恢复数据库

#db2 restore db

8、导出数据文件

#db2move export

9、导入数据文件

#db2move import

10、导出多个指定表

#db2move export -tn   -u  用户名称  -p 用户密码

11、恢复数据库

12、导出数据表结构

#db2look -d  cypx_hn -e  -a -x  -o ddlfile.sql

db2look -d  cypx_hn -e  -a -x  -o ddlfile.sql

13、恢复数据库

#db2 restore db jdcjsy from D:\db2back\db2 taken at 20140619000010 on D: dbpath on D: into jdcjsy

#db2 rollforward db jdcddd complete

14.

db2ilist:列出DB2所有实例

db2 get instance:显示当前实例

db2 list db directory:列出当前实例下的所有数据库

db2 list active databases：列出当前连接的数据库

db2 list applications：列出所有对数据库的连接。

db2 get snapshot for dbm:查看活动的本地数据库（数据库快照）

db2 -v reorgchk update statistics on table all:重建索引

db2 get db cfg for jdc_hy

db2 update db cfg for jdc_hy using LOGFILSIZ 10000

update db cfg for using

db2数据库调优：

1.参数设置——性能

（1）堆栈 1024

（2）日志 1024

（3）超时时间 15~20秒（重要）

（4）缓冲池 50000（重要）

15、新建数据库

db2 CREATE DATABASE jdcjsy AUTOMATIC STORAGE NO ON 'd:\jdcjsy' USING CODESET UTF-8 TERRITORY CN COLLATE USING SYSTEM PAGESIZE 4096 CATALOG TABLESPACE  MANAGED BY DATABASE USING ( FILE 'd:\jdcjsy\system\systemspace1' 64000 )  USER TABLESPACE  MANAGED BY DATABASE USING ( FILE 'd:\jdcjsy\user\userspace1' 64000 )  TEMPORARY TABLESPACE  MANAGED BY DATABASE USING ( FILE 'd:\jdcjsy\temp\tempspace1' 64000 )

16、迁移db2日志,以及修改活动日志大小

db2 update db cfg for using LOGFILSIZ 10000

db2 update db cfg for using  NEWLOGPATH

db2 terminate 

db2stop

db2start

ALTER TABLE ADMINISTRATOR.T_MK ALTER COLUMN MKQX SET DATA TYPE VARCHAR ( 300 ) ;

4.为字段添加默认值

alter table [table_name] alter column [column_name] set default [value];

2.更改字段类型

alter table  [table_name] alter column [column_name] set data type  [column_type]

3.去掉字段

alter table [table_name] drop column [column_name]

注意:drop掉字段之后,可能会导致表查询/插入操作不能执行,需要对表进行reorg

添加带默认值的字段

alter table [table_name] add column [column_name] [column_type] not null with default [value]

6. 设置字段默认时间为当前时间

alter table [table_name] alter column [column_name] set default  current date;

7.根据sql导出excel

db2  export to d:\data.xlsx of del modified by nochardel coldel0x09 select * from t_xysqxxb where xm='文静'

8、时间函数加减

update  t_pxjlzsb  set pxjssj =(timestamp(pxkssj) +4 hour) ,pxsc=240  where  pxsc>360 and  czsj >'2015-01-01'

添加约束

alter table t_xysqxxb522600 add CONSTRAINT constraint_xybh UNIQUE (xybh)

db2 export  to d:\data.xlsx of del modified by nochardel coldel0x09  SELECT a.UnitName,a.CarNo,a.Sim,a.CarNo,sum(case when d.MILEAGE is null then 0 else d.MILEAGE/1000 end) as Mileage,sum(case when d.XSSC is null then 0 else d.XSSC/60 end) as TeachTime FROM DB2INST1.V_GPSCARINFO a LEFT OUTER JOIN (SELECT * FROM DB2INST1.G_MONMILEAGE WHERE TIME between '2014-01-01' and '2014-12-31') d ON a.SIM=d.ZDID where 1=1  group by  a.UnitName,a.CarNo,a.Sim  order by UnitName

db2  export  to d:\data.xlsx of del modified by nochardel coldel0x09  SELECT a.UnitName,a.CarNo,a.Sim,sum(case when d.MILEAGE is null then 0 else d.MILEAGE/1000 end) as Mileage,sum(case when d.XSSC is null then 0 else d.XSSC/60 end) as TeachTime FROM DB2INST1.V_GPSCARINFO a LEFT OUTER JOIN (SELECT * FROM DB2INST1.G_MONMILEAGE WHERE TIME between '2014-01-01' and '2014-12-31') d ON a.SIM=d.ZDID where 1=1  group by  a.UnitName,a.CarNo,a.Sim  order by UnitName

6、用export导出指定的表数据

    db2 "export to d:\data\tab1.ixf of ixf lobs to d:\data\ lobfile lobs modified by lobsinsepfiles  messages d:\data\tab1.msg select * from schema_name.table_name"

db2 EXPORT  TO xyxx20181123.csv  OF  DEL  modified by codepage=1208  select  * From  administrator.t_xysqxxb where pxsj between '2011-07-01' and '2018-11-23'

db2 EXPORT  TO xyxx20190104.csv  OF  DEL  modified by codepage=1208  select  xm,zjh From  administrator.t_xysqxxb where pxsj between '2008-01-01' and '2018-12-31' union all  select  xm,zjh  From  administrator.t_xydaxxb where pxsj between '2008-01-01' and '2018-12-31'

Import from  D:\ xxxxtablenaeme.csv of del    OF      DEL  modified by codepage=1208      insert into tablename