1.1赋权（将crh_snp用户赋权具体创建dblink权限）
在sys用户下，把CREATE PUBLIC DATABASE LINK，DROP PUBLIC DATABASE LINK权限授予给你的用户
grant CREATE PUBLIC DATABASE LINK，DROP PUBLIC DATABASE LINK to crh_snp;
1.2具体创建db_link
然后以crh_snp用户登录本地数据库,执行以下语名
create database linkdcrac2
connect to wlyxpt identified by wlyxpt
using '(DESCRIPTION =
(ADDRESS_LIST =
(address = (protocol = tcp)(host = 192.19.0.81)(port = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = dcrac)
(INSTANCE_NAME = dcrac2)
(failover_mode =
(backup = dcrac1)
(type = select)
(method = preconnect)
)
)
)';
---说明：本次创建的db_link名称为：dcrac2,对方oracle数据库的用户名为wlyxpt，密码--wlyxpt,服务名为dcrac，由于是rac数据库该兰色tnsname配置可由券商相关dba给出
1.3以crh_snp查询ods_ufs.his_his_delive表数据（obs所属表，wlyxpt用户有相应权限）
select * fromods_ufs.his_his_deliver@dcrac2;
2、oracle通过DBlink连接mysql
oracle：系统redhat 5.5 数据库：11.2.0.1
mysql：系统centos6.3 数据库：5.6.21
2.1先装 mysql-connector-odbc和unixODBC
[root@rac1 ~]# rpm -qa | grep mysql
mysql-5.0.77-4.el5_4.2
mysql-5.0.77-4.el5_4.2
mysql-connector-odbc-5.1.13-1.rhel5
[root@rac1 ~]# rpm -qa | grep ODBC
unixODBC-devel-2.2.11-7.1
unixODBC-2.2.11-7.1
unixODBC-devel-2.2.11-7.1
unixODBC-2.2.11-7.1
2.2.配置 /etc/odbc.ini
[myodbc3]
Driver = /usr/lib64/libmyodbc5.so
Description = MySQL ODBC 5.1 Driver DSN
SERVER = 192.1.1.200
PORT = 3306
USER = bi
Password = 123456
Database = chanpin
OPTION = 3
SOCKET =
charset = utf8
2.3.配置/etc/odbcinst.ini
[MySQL]
Description = ODBC for MySQL
Driver = /usr/lib64/libmyodbc5.so
Setup = /usr/lib64/libodbcmyS.so
FileUsage = 1
2.4.测试连接
[root@rac1 ~]# isql myodbc3 -v
+---------------------------------------+
| Connected! |
| |
| sql-statement |
| help [tablename] |
| quit |
| |
+---------------------------------------+
SQL>
2.5.配置oracle环境变量
export ORACLE_BASE=/u01/app/oracle
export GRID_HOME=/u01/grid
export ORACLE_HOME=$ORACLE_BASE/product/11.2.0/db_1
export ORACLE_SID=rac1
export BASE_PATH=/usr/sbin:$PATH
export PATH=$ORACLE_HOME/bin:$BASE_PATH:/usr/bin
export LD_LIBRARY_PATH=$ORACLE_HOME/lib:/lib:/usr/lib:/usr/local/lib:$ORACLE_HOME/hs/lib:/usr/lib64
export CLASSPATH=$ORACLE_HOME/JRE:$ORACLE_HOME/jlib:$ORACLE_HOME/rdbms/jlib
ODBCINI=/etc/odbc.ini; export ODBCINI
ODBCSYSINI=/etc; export ODBCSYSINI
ODBCINSTINI=/etc/odbc.ini
export ODBCINSTINI
2.6.配置监听
listener.ora文件:
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.1.1.100)(PORT = 1522))
)
)
SID_LIST_LISTENER=
(SID_LIST=
(SID_DESC=
(PROGRAM = dg4odbc)
(SID_NAME= myodbc3)
(ORACLE_HOME= /u01/app/oracle/product/11.2.0/db_1)
(ENVS=LD_LIBRARY_PATH=/u01/app/oracle/product/11.2.0/db_1/lib:/lib:/usr/lib:/usr/local/lib:/u01/app/oracle/product/11.2.0/db_1/hs/lib:/usr/lib64)
)
)
tnsname.ora文件:
myodbc3=
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.1.1.100)(PORT = 1522))
(CONNECT_DATA =
(SID = myodbc3))
(HS = OK)
)
2.7.配置odbc监听
路径：$ORACLE_HOME/hs/admin
注意：名字要跟odbc配置的名字一样我这里是myodbc3
[oracle@rac1 admin]$cd $ORACLE_HOME/hs/admin
[oracle@rac1 admin]$ cat initmyodbc3.ora
HS_FDS_CONNECT_INFO = myodbc3
HS_FDS_TRACE_LEVEL = ON
HS_FDS_TRACE_FILE_NAME = odbc_test.log
HS_FDS_TRACE_LEVEL = 4
HS_FDS_SHAREABLE_NAME = /usr/lib64/libodbc.so
HS_FDS_SUPPORT_STATISCTICS = FALSE
HS_LANGUAGE = AMERICAN_AMERICA.WE8ISO8859P1
#HS_FDS_SQLLEN_INTERPRETATION=32
set ODBCINI = /etc/odbc.ini
2.8.测试监听
[oracle@rac1 admin]$ tnsping myodbc3
TNS Ping Utility for Linux: Version 11.2.0.1.0 - Production on 25-NOV-2014 03:02:16
Copyright (c) 1997, 2009, Oracle. All rights reserved.
Used parameter files:
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.1.1.100)(PORT = 1522)) (CONNECT_DATA = (SID = myodbc3)) (HS = OK))
OK (0 msec)
2.9.创建dblink
SQL>create public database link myodbc connect to "bi" identified by "123456" using'myodbc3';
SQL>select count(*) from "t_user"@myodbc;
COUNT(*)
----------
53980
3、删除dblink
DROPPUBLICDATABASELINK tomysql;