db2数据库常用语句

/**链接数据库**/

获取权限        

    sudo su db2inst1

列出所有数据库

    db2 list db directory

链接到指定数据库

    db2 connect to [db2name]

回到根目录

     cd ~

打开输入语句

    db2

查询模式名 

    select * from syscat.schemata

查询模式下所有表名

    select [tabname] from syscat.tables where tabschema = ‘[schema]’

/**基本语句**/

插入

    #db2 insert into schema.table (a,b,c) values (‘a’,’b’,’c’)

删除

    #db2 delete from schema.table where condition = condition

修改

    #db2 update schema.table set a = ‘a’ where condition = condition

查询

    #db2 select * from schema.table where condition = condition

修改字段值为当前字段值+’字符串’

    #db2 update from schema.table set [column] = [column] || ‘[str]’ where 
condition = condition

修改字段值小写字母变为大写

    #db2 update from schema.table set [column] = Upper(
[column]
) where 
condition = condition

只读查询

    #db2 sql + for read only with ur

/**常用操作语句**/

打开命令行窗口

    #db2cmd

打开控制中心

　 # db2cmd db2cc

打开命令编辑器

　db2cmd db2ce

启动数据库实例

　 #db2start

停止数据库实例

　 #db2stop

　如果你不能停止数据库由于激活的连接，在运行db2stop前执行db2 force application all就可以了 /db2stop force

创建数据库

　 #db2 create database 数据库名 using codeset GBK territory CN COLLATE USING SYSTEM

创建数据库指定位置

    #db2 db2 create database ghzj on /home/db2inst1/db2data using codeset GBK territory CN COLLATE USING SYSTEM

连接到数据库

　 #db2 connect to [dbname] user [username] using [password]

断开数据库连接

　 #db2 connect reset

列出所有数据库

　#db2 list db directory

列出所有激活的数据库

　 #db2 list active databases

列出所有数据库配置

　 #db2 get db cfg

删除数据库

　 #db2 drop database [dbname]

（执行此操作要小心）

如果不能删除，断开所有数据库连接或者重启db2

列出所有用户表

　 #db2 list tables

出所有系统表

　#db2 list tables for system

列出所有表

　 #db2 list tables for all

列出系统表

　 #db2 list tables for system

列出用户表

　 #db2 list tables for user

列出特定用户表

　 #db2 list tables for schema [user]

创建一个与数据库中某个表(t2)结构相同的新表(t1)

　 #db2 create table t1 like t2

将一个表t1的数据导入到另一个表t2

    #db2 “insert into t1 select * from t2”

显示表结构

　 #db2 describe table tablename

修改列

　 #db2 alter table [tablename] alter column [columname] set data type varchar(24)

插入列

    
#db2 alter table [tablename] add column [columname] varchar(100)

/**序列**/

新建序列

    create sequence [schema].[tablename] start with 1 increment by 1 nomaxvalue nocycle;

查看下一个序列值

    #db2 values nextval for schema.table_name

重置序列值

    #db2 alter sequence schema.table_name restart with [nextval]

导出数据

    #db2 export to /home/db2inst1/db2work/process_dw/dt_org.ixf of ixf select * from ghzj.dt_org;

导入数据

    #db2 import from “/home/db2inst1/hebei_org.ixf” of ixf insert into ghzj.dt_org

导入数据指定表空间

  #db2 import from “/home/db2inst1/db2work/area_2017.ixf” of ixf  create into  iris.ct_area_2017  IN “TS_DW_TBL” INDEX IN “TS_DW_IDX”

列出数据库配置信息

    #db2 db2 get db cfg for [db2name]

列出所有表空间

select substr(tbsp_name,1,20) as TABLESPACE_NAME,substr(tbsp_content_type,1,10) as TABLESPACE_TYPE,sum(tbsp_total_size_kb)/1024 as  TOTAL_MB,sum(tbsp_used_size_kb)/1024 as USED_MB,sum(tbsp_free_size_kb)/1024 as  FREE_MB,tbsp_page_size AS PAGE_SIZE from SYSIBMADM.TBSP_UTILIZATION group by  tbsp_name,tbsp_content_type,tbsp_page_size order by 1

设置表空间

CREATE BUFFERPOOL BP_CT_IDX IMMEDIATE SIZE 1000 AUTOMATIC PAGESIZE 4K;

CREATE BUFFERPOOL BP_CT_TBL IMMEDIATE SIZE 1000 AUTOMATIC PAGESIZE 4K;

CREATE BUFFERPOOL BP_DT_IDX IMMEDIATE SIZE 1000 AUTOMATIC PAGESIZE 4K;

CREATE BUFFERPOOL BP_DT_TBL IMMEDIATE SIZE 1000 AUTOMATIC PAGESIZE 4K;

CREATE BUFFERPOOL BP_USER_IDX IMMEDIATE SIZE 1000 AUTOMATIC PAGESIZE 4K ;

CREATE BUFFERPOOL BP_USER_TBL IMMEDIATE SIZE 1000 AUTOMATIC PAGESIZE 4K ;

CREATE BUFFERPOOL BP_DATA_IDX IMMEDIATE SIZE 1000 AUTOMATIC PAGESIZE 4K;

CREATE BUFFERPOOL BP_DATA_TBL IMMEDIATE SIZE 1000 AUTOMATIC PAGESIZE 4K;

CREATE BUFFERPOOL BP_LOG_IDX IMMEDIATE SIZE 1000 AUTOMATIC PAGESIZE 4K;

CREATE BUFFERPOOL BP_LOG_TBL IMMEDIATE SIZE 1000 PAGESIZE 4K;

CREATE BUFFERPOOL BP_DW_IDX IMMEDIATE SIZE 1000 AUTOMATIC PAGESIZE 4K;

CREATE BUFFERPOOL BP_DW_TBL IMMEDIATE SIZE 1000 PAGESIZE 4K;

CREATE BUFFERPOOL BP_TEMP IMMEDIATE SIZE 1000 AUTOMATIC PAGESIZE 4K;

CREATE REGULAR TABLESPACE TS_CT_IDX PAGESIZE 4K MANAGED BY AUTOMATIC STORAGE EXTENTSIZE 8 PREFETCHSIZE AUTOMATIC BUFFERPOOL BP_CT_IDX;

CREATE REGULAR TABLESPACE TS_CT_TBL PAGESIZE 4K MANAGED BY AUTOMATIC STORAGE EXTENTSIZE 8 PREFETCHSIZE AUTOMATIC BUFFERPOOL BP_CT_TBL;

CREATE REGULAR TABLESPACE TS_DT_IDX PAGESIZE 4K MANAGED BY AUTOMATIC STORAGE EXTENTSIZE 8 PREFETCHSIZE AUTOMATIC BUFFERPOOL BP_DT_IDX;

CREATE REGULAR TABLESPACE TS_DT_TBL PAGESIZE 4K MANAGED BY AUTOMATIC STORAGE EXTENTSIZE 16 PREFETCHSIZE AUTOMATIC BUFFERPOOL BP_DT_TBL;

CREATE REGULAR TABLESPACE TS_USER_IDX PAGESIZE 4K MANAGED BY AUTOMATIC STORAGE EXTENTSIZE 8 PREFETCHSIZE AUTOMATIC BUFFERPOOL BP_USER_IDX;

CREATE REGULAR TABLESPACE TS_USER_TBL PAGESIZE 4K MANAGED BY AUTOMATIC STORAGE EXTENTSIZE 16 PREFETCHSIZE AUTOMATIC BUFFERPOOL BP_USER_TBL;

CREATE REGULAR TABLESPACE TS_DATA_IDX PAGESIZE 4K MANAGED BY AUTOMATIC STORAGE EXTENTSIZE 16 PREFETCHSIZE AUTOMATIC BUFFERPOOL BP_DATA_IDX;

CREATE LARGE TABLESPACE TS_DATA_TBL PAGESIZE 4K MANAGED BY AUTOMATIC STORAGE EXTENTSIZE 32 PREFETCHSIZE AUTOMATIC BUFFERPOOL BP_DATA_TBL;

CREATE REGULAR TABLESPACE TS_LOG_IDX PAGESIZE 4K MANAGED BY AUTOMATIC STORAGE EXTENTSIZE 16 PREFETCHSIZE AUTOMATIC BUFFERPOOL BP_LOG_IDX;

CREATE LARGE TABLESPACE TS_LOG_TBL PAGESIZE 4K MANAGED BY AUTOMATIC STORAGE EXTENTSIZE 32 PREFETCHSIZE AUTOMATIC BUFFERPOOL BP_LOG_TBL;

CREATE REGULAR TABLESPACE TS_DW_IDX PAGESIZE 4K MANAGED BY AUTOMATIC STORAGE EXTENTSIZE 16 PREFETCHSIZE AUTOMATIC BUFFERPOOL BP_DW_IDX;

CREATE LARGE TABLESPACE TS_DW_TBL PAGESIZE 4K MANAGED BY AUTOMATIC STORAGE EXTENTSIZE 64 PREFETCHSIZE AUTOMATIC BUFFERPOOL BP_DW_TBL;

CREATE USER TEMPORARY TABLESPACE TS_TEMPUSER PAGESIZE 4K MANAGED BY AUTOMATIC STORAGE EXTENTSIZE 16 PREFETCHSIZE AUTOMATIC BUFFERPOOL BP_TEMP;

CREATE SYSTEM TEMPORARY TABLESPACE TS_TEMPSYS PAGESIZE 4K MANAGED BY AUTOMATIC STORAGE EXTENTSIZE 16 PREFETCHSIZE AUTOMATIC BUFFERPOOL BP_TEMP;

CREATE BUFFERPOOL BP_8K IMMEDIATE SIZE 1000 AUTOMATIC PAGESIZE 8K;

CREATE LARGE TABLESPACE TS_DATA_8K PAGESIZE 8K MANAGED BY AUTOMATIC STORAGE EXTENTSIZE 32 PREFETCHSIZE AUTOMATIC BUFFERPOOL BP_8K;

CREATE SYSTEM TEMPORARY TABLESPACE TS_TEMPSYS_8K PAGESIZE 8K MANAGED BY AUTOMATIC STORAGE EXTENTSIZE 16 PREFETCHSIZE AUTOMATIC BUFFERPOOL BP_8K;

CREATE BUFFERPOOL BP_16K IMMEDIATE SIZE 1000 AUTOMATIC PAGESIZE 16K;

CREATE LARGE TABLESPACE TS_DATA_16K PAGESIZE 16K MANAGED BY AUTOMATIC STORAGE EXTENTSIZE 32 PREFETCHSIZE AUTOMATIC BUFFERPOOL BP_16K;