【DB2】 理解节点目录，数据库目录
前面通过control center将客户机连接到服务器时，本质上是通过命令行完成的,，在弄清具体过程之前，必须先弄明白 节点目录，系统数据库目录，本地数据库目录几个概念。
节点目录，系统数据库目录，远程数据库目录
创建数据库之后，DB2才会有数据库目录；只有在一个需要连接到服务器的客户机上才需要编目。类似于oracle的tnsname机制。
测试环境：
| OS |
DB2 version |
Instance |
Database |
|
| HOST1 | Windows 2008 R2 x64 | v9.5 ese x86 | DB2 | sample,toolsdb |
| HOST2 | Linux 5.8 x64 | v9.7 aese x64 | db2inst1 | sample,test1 |
并且在HOST1中使用control center将HOST2下的实例与数据库进行了注册
一.节点目录
用于存储远程数据库的所有连通性信息。
在control conter所在机器（即客户机角色），查看节点目录
C:\Program Files (x86)\IBM\SQLLIB\BIN>db2 list node directory
Node Directory
Number of entries in the directory = 1
Node 1 entry:
Node name = DB2INST1
Comment =
Directory entry type = LOCAL
Protocol = TCPIP
Hostname = ibm1
Service name = 50000
由windows control center得到的语句：
UNCATALOG NODE IBM1;
CATALOG ADMIN TCPIP NODE IBM1 REMOTE ibm1 SYSTEM IBM1 OSTYPE LINUXX8664;
UNCATALOG NODE DB2INST1;
CATALOG TCPIP NODE DB2INST1 REMOTE ibm1 SERVER 50000 REMOTE_INSTANCE db2inst1 SYSTEM IBM1 OSTYPE LINUXX8664;
节点目录文件的位置：
windows2003下：
C:\Documents and Settings\All Users\Application Data\IBM\DB2\DB2COPY1\DB2\SQLNODIR\SQLNODIR
windows2008：
C:\ProgramData\IBM\DB2\DB2COPY1\DB2\SQLNODIR
Linux下：
/home/db2inst1/sqllib/sqlnodir/sqlnodir
同一文件夹下的SQLNOBAK是SQLNODIR的备份，都是二进制文件。
在linux下建立联通到windows下的节点目录：
[db2inst1@ibm1 ~]$ db2 catalog tcpip node db2win remote 10.0.0.52 server 50000
DB20000I The CATALOG TCPIP NODE command completed successfully.
DB21056W Directory changes may not be effective until the directory cache is
refreshed.
[db2inst1@ibm1 ~]$ db2 list node directory
Node Directory
Number of entries in the directory = 1
Node 1 entry:
Node name = DB2WIN
Comment =
Directory entry type = LOCAL
Protocol = TCPIP
Hostname = 10.0.0.52
Service name = 50000
解除节点目录：
[db2inst1@ibm1 ~]$ db2 uncatalog node db2win
DB20000I The UNCATALOG NODE command completed successfully.
DB21056W Directory changes may not be effective until the directory cache is
refreshed.
二.系统数据库目录：
包含本地数据库目录与远程映射到本地的数据库目录。
系统数据库目录是在实例级存储的，对于每个实例，都存在一个数据库目录文件，该文件针对此实例编目的每个数据库都包含一个条目。
windows下查看系统数据库目录
C:\Program Files (x86)\IBM\SQLLIB\BIN>db2 list db directory
System Database Directory
Number of entries in the directory = 4
Database 1 entry:
Database alias = TOOLSDB
Database name = TOOLSDB
Local database directory = C:
Database release level = c.00
Comment =
Directory entry type = Indirect
Catalog database partition number = 0
Alternate server hostname =
Alternate server port number =
Database 2 entry:
Database alias = SAMPLE1
Database name = SAMPLE
Node name = DB2INST1
Database release level = c.00
Comment =
Directory entry type = Remote
Catalog database partition number = -1
Alternate server hostname =
Alternate server port number =
Database 3 entry:
Database alias = TEST1
Database name = TEST1
Node name = DB2INST1
Database release level = c.00
Comment =
Directory entry type = Remote
Catalog database partition number = -1
Alternate server hostname =
Alternate server port number =
Database 4 entry:
Database alias = SAMPLE
Database name = SAMPLE
Local database directory = C:
Database release level = c.00
Comment =
Directory entry type = Indirect
Catalog database partition number = 0
Alternate server hostname =
Alternate server port number =
Linux下将windows下DB注册到数据库目录：
(特别注意，注册数据库目录的前提是要先有节点目录)[db2inst1@ibm1 ~]$ db2 catalog db sample as sample2 at node db2win
DB20000I The CATALOG DATABASE command completed successfully.
DB21056W Directory changes may not be effective until the directory cache is
refreshed.
Linux下查看系统数据库目录：
[db2inst1@ibm1 ~]$ db2 list db directory
System Database Directory
Number of entries in the directory = 3
Database 1 entry:
Database alias = SAMPLE2
Database name = SAMPLE
Node name = DB2WIN
Database release level = d.00
Comment =
Directory entry type = Remote
Catalog database partition number = -1
Alternate server hostname =
Alternate server port number =
Database 2 entry:
Database alias = TEST1
Database name = TEST1
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 =
Database 3 entry:
Database alias = SAMPLE
Database name = SAMPLE
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 =
解除数据库目录
[db2inst1@ibm1 ~]$ db2 uncatalog db sample2
DB20000I The UNCATALOG DATABASE command completed successfully.
DB21056W Directory changes may not be effective until the directory cache is
refreshed.
三. 本地数据库目录
包含了驻留在当前机器上的数据库信息。本地数据库目录目录驻留在数据库结构内部。当create database
时会隐式地对数据库进行编目。
windows下查看本地数据库目录：
C:\Program Files (x86)\IBM\SQLLIB\BIN>db2 list db directory on c:
Local Database Directory on c:
Number of entries in the directory = 2
Database 1 entry:
Database alias = TOOLSDB
Database name = TOOLSDB
Database directory = SQL00001
Database release level = c.00
Comment =
Directory entry type = Home
Catalog database partition number = 0
Database partition number = 0
Database 2 entry:
Database alias = SAMPLE
Database name = SAMPLE
Database directory = SQL00002
Database release level = c.00
Comment =
Directory entry type = Home
Catalog database partition number = 0
Database partition number = 0
linux下查看本地数据库目录：
[db2inst1@ibm1 ~]$ db2 list db directory on /home/db2inst1/
Local Database Directory on /home/db2inst1/
Number of entries in the directory = 2
Database 1 entry:
Database alias = TEST1
Database name = TEST1
Database directory = SQL00001
Database release level = d.00
Comment =
Directory entry type = Home
Catalog database partition number = 0
Database partition number = 0
Database 2 entry:
Database alias = SAMPLE
Database name = SAMPLE
Database directory = SQL00002
Database release level = d.00
Comment =
Directory entry type = Home
Catalog database partition number = 0
Database partition number = 0
四.从linux下，通过系统数据库目录连接到windows下的sample数据库
在准备connect 之前，先查看有哪些db directory可用：
[db2inst1@ibm1 ~]$ db2 list db directory
System Database Directory
Number of entries in the directory = 3
Database 1 entry:
Database alias = SAMPLE2
Database name = SAMPLE
Node name = DB2WIN
Database release level = d.00
Comment =
Directory entry type = Remote
Catalog database partition number = -1
Alternate server hostname =
Alternate server port number =
Database 2 entry:
Database alias = TEST1
Database name = TEST1
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 =
Database 3 entry:
Database alias = SAMPLE
Database name = SAMPLE
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@ibm1 ~]$ db2 connect to sample2 user db2admin using db2admin
Database Connection Information
Database server = DB2/NT 9.5.0
SQL authorization ID = DB2ADMIN
Local database alias = SAMPLE2
[db2inst1@ibm1 ~]$ db2 "select * from administrator.employee"
EMPNO FIRSTNME MIDINIT LASTNAME WORKDEPT PHONENO HIREDATE JOB EDLEVEL SEX BIRTHDATE SALARY BONUS COMM
------ ------------ ------- --------------- -------- ------- ---------- -------- ------- --- ---------- ----------- ----------- -----------
000010 CHRISTINE I HAAS A00 3978 01/01/1995 PRES 18 F 08/24/1963 152750.00 1000.00 4220.00
000020 MICHAEL L THOMPSON B01 3476 10/10/2003 MANAGER 18 M 02/02/1978 94250.00 800.00 3300.00
000030 SALLY A KWAN C01 4738 04/05/2005 MANAGER 20 F 05/11/1971 98250.00 800.00 3060.00
.......................
42 record(s) selected.