{"id":4956,"date":"2024-07-01T07:00:00","date_gmt":"2024-07-01T04:00:00","guid":{"rendered":"https:\/\/www.dataplatform.gr\/?p=4956"},"modified":"2024-06-30T14:12:12","modified_gmt":"2024-06-30T11:12:12","slug":"pos-mporoyme-na-syndesoyme-oracle-database-me-sql-server-me-2","status":"publish","type":"post","link":"https:\/\/www.dataplatform.gr\/en\/pos-mporoyme-na-syndesoyme-oracle-database-me-sql-server-me-2-2\/","title":{"rendered":"How can we connect Oracle Database to SQL Server using Oracle Gateway on Linux"},"content":{"rendered":"<p>In this article we will see how we can execute queries on remote SQL Server from Oracle Database on Oracle Linux \/ Red Hat Linux.  <\/p>\n\n\n\n<p>In <a href=\"https:\/\/www.dataplatform.gr\/en\/pos-mporoyme-na-syndesoyme-sql-server-me-oracle-database-me\/\" target=\"_blank\" rel=\"noreferrer noopener\">previous<\/a> article we saw how the reverse process is done to connect from SQL Server Instance to Oracle Database via <strong>Linked Server<\/strong>. This time we will install one <strong>Oracle Database Gateway<\/strong> through which we will make one <strong>Database Link<\/strong> to a database located on SQL Server.<\/p>\n\n\n\n<p>Oracle Gateway can be installed either on one of the database servers or on a third party machine that will act as an intermediary. In this example we will proceed with the installation on the Linux Oracle Database.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">The footsteps<\/h2>\n\n\n\n<h4 class=\"wp-block-heading\">On the SQL Server Instance<\/h4>\n\n\n\n<p>To begin with, we will have to create a login in the SQL Server Instance that will have read access to the database that we want to read from the Oracle Database. In our example we will create a user named <em>oraclepw<\/em> and will have access to the base <em>mig_db<\/em>:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"sql\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">USE [master]\nGO\nCREATE LOGIN [oraclegw] WITH PASSWORD=N'password', DEFAULT_DATABASE=[master], CHECK_EXPIRATION=OFF, CHECK_POLICY=OFF\nGO\nUSE [mig_db]\nGO\nCREATE USER [oraclegw] FOR LOGIN [oraclegw]\nGO\nUSE [mig_db]\nGO\nALTER ROLE [db_datareader] ADD MEMBER [oraclegw]\nGO<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">On Oracle Database Linux Server <\/h4>\n\n\n\n<p>In Linux where the Oracle Database is located we download the <strong>ODBC driver for SQL Server <\/strong>and install it.<\/p>\n\n\n\n<p>To install, run the following code as it is:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">#Red Hat Enterprise Server 7 and Oracle Linux 7\ncurl https:\/\/packages.microsoft.com\/config\/rhel\/7\/prod.repo > \/etc\/yum.repos.d\/mssql-release.repo\n\nexit\nsudo yum remove unixODBC-utf16 unixODBC-utf16-devel #to avoid conflicts\nsudo ACCEPT_EULA=Y yum install -y msodbcsql18\n# optional: for bcp and sqlcmd\nsudo ACCEPT_EULA=Y yum install -y mssql-tools18\necho 'export PATH=\"$PATH:\/opt\/mssql-tools18\/bin\"' >> ~\/.bashrc\nsource ~\/.bashrc\n# optional: for unixODBC development headers\nsudo yum install -y unixODBC-devel\n<\/pre>\n\n\n\n<p>Then we open the file containing the list of drivers to see that there is a registration with ODBC for SQL Server and to keep the path where the driver is located:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">vi \/etc\/odbcinst.ini<\/pre>\n\n\n\n<pre class=\"wp-block-code\" data-no-translation=\"\" data-no-auto-translation=\"\"><code>&#91;ODBC Driver 18 for SQL Server]\nDescription=Microsoft ODBC Driver 18 for SQL Server\nDriver=\/opt\/microsoft\/msodbcsql18\/lib64\/libmsodbcsql-18.1.so.2.1\nUsageCount=1\n<\/code><\/pre>\n\n\n\n<p>Then we go to add the DSN (Data Source Name) entry for ODBC:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">vi \/etc\/odbc.ini<\/pre>\n\n\n\n<p>There we put the record like the example below changing its name, the name of the server, the name of the database and as a driver the path from the previous step:<\/p>\n\n\n\n<pre class=\"wp-block-code\" data-no-translation=\"\" data-no-auto-translation=\"\"><code>&#91;MIG_DB]\nDescription     = MSSQL Server\nTrace           = No\nServer          = SMATZOURANISLP\nDatabase        = MIG_DB\nPort            = 1433\nTDS_Version     = 7.2\nDriver=\/opt\/microsoft\/msodbcsql18\/lib64\/libmsodbcsql-18.1.so.2.1\nTrustServerCertificate=Yes<\/code><\/pre>\n\n\n\n<p>To test that it works, we run the following by putting the DSN name, the username we created in SQL Server and the password:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">isql MIG_DB oraclegw 'password' -v<\/pre>\n\n\n\n<p>If it works correctly it will display the following message:<\/p>\n\n\n\n<pre class=\"wp-block-code\" data-no-translation=\"\" data-no-auto-translation=\"\"><code>+---------------------------------------+\n| Connected!                            |\n|                                       |\n| sql-statement                         |\n| help &#91;tablename]                      |\n| quit                                  |\n|                                       |\n+---------------------------------------+<\/code><\/pre>\n\n\n\n<p>As a next step, we should create the following file by putting the corresponding name with the DSN:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">vi $ORACLE_HOME\/hs\/admin\/initMIG_DB.ora<\/pre>\n\n\n\n<p>To this we add the following entries changing only the parameter <code>HS_FDS_CONNECT_INFO<\/code> with the name of the DSN we have made, as <code>HS_LANGUAGE <\/code>define the encoding of the Oracle Database that will be the destination:<\/p>\n\n\n\n<pre class=\"wp-block-code\" data-no-translation=\"\" data-no-auto-translation=\"\"><code>HS_FDS_CONNECT_INFO = MIG_DB\nHS_FDS_TRACE_LEVEL = OFF\nHS_FDS_SHAREABLE_NAME = \/usr\/lib64\/libodbc.so\nset ODBCINI=\/etc\/odbc.ini\nHS_KEEP_REMOTE_COLUMN_SIZE = LOCAL\nHS_NLS_NCHAR=UCS2\nHS_LANGUAGE=AMERICAN_AMERICA.AL32UTF8\n<\/code><\/pre>\n\n\n\n<p>Then we go to <strong>listener.ora<\/strong> and add the following record by putting as SID_NAME the name of the DSN (to keep it as simple as possible) and the corresponding <code>ORACLE_HOME<\/code>:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">vi $ORACLE_HOME\/network\/admin\/listener.ora<\/pre>\n\n\n\n<pre class=\"wp-block-code\" data-no-translation=\"\" data-no-auto-translation=\"\"><code>SID_LIST_LISTENER=\n(SID_DESC=\n  (SID_NAME=MIG_DB)\n  (ORACLE_HOME=\/oracle\/nfs\/app\/oracle\/product\/12.1.0.2\/dbhome_1)\n  (PROGRAM=dg4odbc)\n)<\/code><\/pre>\n\n\n\n<p>After adding the registration to the listener, we reload it:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">lsnrctl reload<\/pre>\n\n\n\n<p>Then we add this recording that we made to the listener <strong>tnsnames.ora<\/strong>:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">vi $ORACLE_HOME\/network\/admin\/tnsnames.ora<\/pre>\n\n\n\n<p><em>* Be careful to put the Linux Oracle Database Server as the host and not the SQL Server, with the door as it is.<\/em><\/p>\n\n\n\n<pre class=\"wp-block-code\" data-no-translation=\"\" data-no-auto-translation=\"\"><code>MIG_DB =\n  (DESCRIPTION=\n    (ADDRESS=(PROTOCOL=tcp)(HOST=oracledev1)(PORT=1521))\n      (CONNECT_DATA=(SID=MIG_DB))\n      (HS=OK)\n    )\n<\/code><\/pre>\n\n\n\n<p>Finally we make it <strong>Database Link<\/strong>, specifying a name, the SQL Server login, the password and the name of the record we added to tnsnames.ora:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"sql\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">sqlplus \/ as sysdba\n\nCREATE DATABASE LINK SQLDBLINK CONNECT TO \"oraclegw\" IDENTIFIED BY \"password\" USING 'MIG_DB';<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">The test<\/h2>\n\n\n\n<p>After creating the Database Link, we can query the Oracle Database to call the database tables in the SQL Server as below:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"sql\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">select * from dbo.customers@sqldblink;<\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"458\" height=\"213\" src=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/11\/ogw-01.png\" alt=\"\" class=\"wp-image-4957\" srcset=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/11\/ogw-01.png 458w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/11\/ogw-01-300x140.png 300w\" sizes=\"auto, (max-width: 458px) 100vw, 458px\" \/><figcaption class=\"wp-element-caption\">01<\/figcaption><\/figure>\n\n\n\n<p>In the event that the following error appears to us:<\/p>\n\n\n\n<pre class=\"wp-block-code\" data-no-translation=\"\" data-no-auto-translation=\"\"><code>ERROR at line 1:\nORA-02085: database link SQLDBLINK connects to HO.WORLD\n<\/code><\/pre>\n\n\n\n<p>Then we need to disable them <strong>global names<\/strong> with the following command:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">alter system set global_names = false scope=both;<\/pre>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Sources:<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/docs.oracle.com\/en\/database\/oracle\/oracle-database\/12.2\/odbcu\/database-gateway-for-odbc-introduction.html#GUID-01E50954-A8BD-400C-ACA9-7F6A7AD1BFD6\" target=\"_blank\" rel=\"noreferrer noopener\">Introduction to Oracle Database Gateway for ODBC<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/learn.microsoft.com\/en-us\/sql\/connect\/odbc\/linux-mac\/installing-the-microsoft-odbc-driver-for-sql-server?view=sql-server-ver16\" target=\"_blank\" rel=\"noreferrer noopener\">Install the Microsoft ODBC driver for SQL Server (Linux)<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/docs.oracle.com\/en\/database\/oracle\/oracle-database\/19\/otgis\/config-sqlserver-gateway.html#GUID-1503C3E7-6A58-449D-B6F7-3D95CD4A636F\" target=\"_blank\" rel=\"noreferrer noopener\">Configuring Oracle Database Gateway for SQL Server<\/a><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>In this article we will see how we can execute queries on remote SQL Server from Oracle Database on Oracle Linux \/ Red Hat Linux. In a previous article we saw how the reverse process is done to connect from SQL Server Instance to Oracle Database via Linked Server. This time we will install an Oracle [\u2026]<\/p>","protected":false},"author":1,"featured_media":704,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,16],"tags":[143,29,23,5,173,30,6],"class_list":["post-4956","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-databases","category-oracle-db","tag-database-links","tag-databases","tag-microsoft","tag-oracle-database","tag-oracle-gateway","tag-rdbms","tag-sqlserver"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u03a0\u03ce\u03c2 \u03bc\u03c0\u03bf\u03c1\u03bf\u03cd\u03bc\u03b5 \u03bd\u03b1 \u03c3\u03c5\u03bd\u03b4\u03ad\u03c3\u03bf\u03c5\u03bc\u03b5 Oracle Database \u03bc\u03b5 SQL Server \u03bc\u03b5 \u03c7\u03c1\u03ae\u03c3\u03b7 Oracle Gateway \u03c3\u03b5 Linux - DataPlatform.gr<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dataplatform.gr\/en\/pos-mporoyme-na-syndesoyme-oracle-database-me-sql-server-me-2-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u03a0\u03ce\u03c2 \u03bc\u03c0\u03bf\u03c1\u03bf\u03cd\u03bc\u03b5 \u03bd\u03b1 \u03c3\u03c5\u03bd\u03b4\u03ad\u03c3\u03bf\u03c5\u03bc\u03b5 Oracle Database \u03bc\u03b5 SQL Server \u03bc\u03b5 \u03c7\u03c1\u03ae\u03c3\u03b7 Oracle Gateway \u03c3\u03b5 Linux - 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