针对oracle数据库不同实例之间的数据访问，我们可以直接通过dblink访问，如果oracle数据库想访问mysql/sqlserver等数据库的数据，我们可以通过配置oracle透明网关实现异构数据库dblink访问。
好久没做透明网关的配置了，最近有业务需求，这里将部署过程做个记录，希望对有需要的朋友有所帮助。
一、Oracle数据库通过透明网关访问SQLServer数据库环境说明
RHEL6.6 oracle 11.2.0.4
WinServer 2008R2 SQLServer 2008 R2
Oracle Gateway 11.2.0.4 For SQLServer
二、数据访问流程
oracle client 通过dblink ——>tnsname——>listener——>dg4msql——>SQLServer数据库
三、Oracle透明网关（SQLServer）下载
https://updates.oracle.com/Orion/Download/process_form/p13390677_112040_Linux-x86-64_5of7.zip
这里附mos下载地址页面
四、Oracle Gateway for SQLServer安装
（好久没图形界面安装了，一时还真不适应，这里通过xmanager启动图形界面）
RHEL6.6修改/etc/gdm/custom.conf # GDM configuration storage [daemon] [security] [xdmcp] Enable=1 ---------增加此行 [greeter] [chooser] [debug] 启动Xmanager - Passive 在linux服务器shell执行 export DISPLAY=xmanger_client_ipaddr:0.0 xhost + 执行命令xclock测试图形界面是否生效
[root@test dbbak]# unzip linux.x64_11gR2_gateways.zip
[root@test dbbak]# chown -R oracle:oinstall gateways
[oracle@test dbbak]$ cd gateways/
[oracle@test gateways]$ ./runInstaller
[oracle@test hs]$ which dg4msql
/U01/app/oracle/product/11.2.0.4/bin/dg4msql
制定下面命令验证是否安装成功
[oracle@test admin]$ dg4msql
Oracle Corporation — SATURDAY APR 28 2018 12:24:05.691
Heterogeneous Agent Release 11.2.0.4.0 – 64bit Production Built with
Oracle Database Gateway for MSSQL
五、SQLServer数据库创建账号、授权
/* For security reasons the login is created disabled and with a random password. */ /****** Object: Login [dbtest] Script Date: 04/27/2018 15:43:45 ******/ CREATE LOGIN [dbtest] WITH PASSWORD=N'abcd1234', DEFAULT_DATABASE=[mssql_test], DEFAULT_LANGUAGE=[简体中文], CHECK_EXPIRATION=OFF, CHECK_POLICY=OFF GO EXEC sys.sp_addsrvrolemember @loginame = N'dbtest', @rolename = N'sysadmin' GO EXEC sys.sp_addsrvrolemember @loginame = N'dbtest', @rolename = N'dbcreator' GO ALTER LOGIN [dbtest] DISABLE GO
六、Oracle数据库相关配置
(1)透明网关配置
[oracle@test ~]$ cd /U01/app/oracle/product/11.2.0.4/dg4msql/admin
[oracle@test admin]$ cp -rp initdg4msql.ora initmssql.ora
[oracle@test admin]$ vi initmssql.ora
# HS init parameters HS_FDS_CONNECT_INFO=[10.1.1.2]:1433//mssql_test # alternate connect format is hostname/serverinstance/databasename HS_FDS_TRACE_LEVEL=OFF HS_FDS_RECOVERY_ACCOUNT=RECOVER HS_FDS_RECOVERY_PWD=RECOVER
(2)监听配置
[oracle@test admin]$ vi /U01/app/oracle/product/11.2.0.4/network/admin/listener.ora
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = dbsid)
(SID_NAME = dbsid)
(ORACLE_HOME=/U01/app/oracle/product/11.2.0.4)
)
(SID_DESC=
(SID_NAME=mssql)
(ORACLE_HOME=/U01/app/oracle/product/11.2.0.4)
(PROGRAM=dg4msql)
)
)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.1.1.1)(PORT = 1521))
)
)
重启监听
lsnrctl stop
lsnrctl start
(3)tnsname配置
[oracle@test admin]$ vi /U01/app/oracle/product/11.2.0.4/network/admin/tnsnames.ora
dbsid_mssql =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.1.1.1 )(PORT = 1521))
)
(CONNECT_DATA =
(SID = mssql)
)
(HS = OK)
)
测试tnsname连接
[oracle@test admin]$ tnsping dbsid_mssql
TNS Ping Utility for Linux: Version 11.2.0.4.0 - Production on 27-APR-2018 15:24:57
Copyright (c) 1997, 2013, Oracle. All rights reserved.
Used parameter files:
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 10.1.1.1)(PORT = 1521))) (CONNECT_DATA = (SID = mssql)) (HS = OK))
OK (0 msec)
七、创建dblink
create PUBLIC DATABASE LINK dblk connect to "dbtest" identified by "abcd1234" using 'dbsid_mssql';
八、通过oracle连接SQLServer数据库执行相关操作
SQL> select * from t1@dblk;
id
----------
10
九、错误信息以及处理方法
（1）错误01（这个错误信息导致我浪费了大半天时间）
错误信息：
SQL> select * from t1@dblk;
select * from t1@dblk
*
ERROR at line 1:
ORA-28545: error diagnosed by Net8 when connecting to an agent
Unable to retrieve text of NETWORK/NCR message 65535
ORA-02063: preceding 2 lines from DBLK
监听日志：
<msg time='2018-04-28T09:46:21.146+08:00' org_id='oracle' comp_id='tnslsnr'
type='UNKNOWN' level='16' host_id='test'
host_addr='10.1.1.1'>
<txt>28-APR-2018 09:46:21 * (CONNECT_DATA=(SID=mssql)(CID=(PROGRAM=)(HOST=test)(USER=oracle))) * (ADDRESS=(PROTOCOL=tcp)(HOST=10.1.1.1)(PORT=10397)) * establish * mssql * 12518
</txt>
</msg>
<msg time='2018-04-28T09:46:21.146+08:00' org_id='oracle' comp_id='tnslsnr'
type='UNKNOWN' level='16' host_id='test'
host_addr='10.1.1.1'>
<txt>TNS-12518: TNS:listener could not hand off client connection
TNS-12547: TNS:lost contact
TNS-12560: TNS:protocol adapter error
TNS-00517: Lost contact
Linux Error: 32: Broken pipe
</txt>
</msg>
alter日志：
HS: Unable to establish RPC connection to HS Agent...
HS: ... Agent SID = (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=10.1.1.1)(PORT=1521))(CONNECT_DATA=(SID=dgmsql))), NCR error = 65535 Unable to retrieve text of NETWORK/NCR message 65535
错误原因以及解决办法：
由于数据库版本是11.2.0.4，而gateway版本是11.2.0.1，所以导致上述listener到hs的连接失败，更换gatway版本为11.2.0.4后问题解决。
(2)参考资料
https://blog.csdn.net/shiyu1157758655/article/details/74939952
https://blog.csdn.net/sharqueen_wu/article/details/30237371