{"id":9799,"date":"2017-02-21T14:09:37","date_gmt":"2017-02-21T13:09:37","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/oracle-12c-how-to-correct-the-error-rman-20005-target-database-name-is-ambiguous\/"},"modified":"2017-02-21T14:09:37","modified_gmt":"2017-02-21T13:09:37","slug":"oracle-12c-how-to-correct-the-error-rman-20005-target-database-name-is-ambiguous","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/oracle-12c-how-to-correct-the-error-rman-20005-target-database-name-is-ambiguous\/","title":{"rendered":"Oracle 12c &#8211; How to correct the error: &#8220;RMAN-20005: target database name is ambiguous&#8221;"},"content":{"rendered":"<h2>By William Sescu<\/h2>\n<p>I do have a Data Guard environment, where I have configured the RMAN DB_UNIQUE_NAME persistent setting for my primary and the standby. With the RMAN DB_UNIQUE_NAME settings I am able to run reports my Oracle Data Guard environment from any database. I could e.g. list all archivelogs for SITE1 from SITE2 or the other ways around.<br \/>\nOr I could show all persistent settings for SITE1 from SITE2 and of course the other way around. The only prerequisite for this feature is the RMAN catalog. In case you are not connected to the RMAN catalog you end up with the following error:<\/p>\n<pre class=\"brush: actionscript3; gutter: true; first-line: 1\">RMAN&gt; SHOW ARCHIVELOG DELETION POLICY FOR DB_UNIQUE_NAME 'DBIT121_SITE2';\n\nusing target database control file instead of recovery catalog\nRMAN-00571: ===========================================================\nRMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============\nRMAN-00571: ===========================================================\nRMAN-03002: failure of show command at 02\/21\/2017 13:58:53\nRMAN-05037: FOR DB_UNIQUE_NAME option cannot be used in nocatalog mode<\/pre>\n<p>After connecting to the catalog, you can use this feature, e.g. to show the archive deletion policy.<\/p>\n<pre class=\"brush: actionscript3; gutter: true; first-line: 1\">$ rman target sys\/welcome1 catalog \/@rcat\n\nRecovery Manager: Release 12.1.0.2.0 - Production on Tue Feb 21 14:25:10 2017\n\nCopyright (c) 1982, 2014, Oracle and\/or its affiliates.  All rights reserved.\n\nconnected to target database: DBIT121 (DBID=644484523)\nconnected to recovery catalog database\n\nRMAN&gt; SHOW ARCHIVELOG DELETION POLICY FOR DB_UNIQUE_NAME 'DBIT121_SITE1';\nRMAN configuration parameters for database with db_unique_name DBIT121_SITE1 are:\nCONFIGURE ARCHIVELOG DELETION POLICY TO SHIPPED TO ALL STANDBY BACKED UP 1 TIMES TO DISK;\n\nRMAN&gt; SHOW ARCHIVELOG DELETION POLICY FOR DB_UNIQUE_NAME 'DBIT121_SITE2';\nRMAN configuration parameters for database with db_unique_name DBIT121_SITE2 are:\nCONFIGURE ARCHIVELOG DELETION POLICY TO APPLIED ON ALL STANDBY;<\/pre>\n<p>There are quite a lot options which can be combined with the DB_UNIQUE_NAME feature like the following.<\/p>\n<pre class=\"brush: actionscript3; gutter: true; first-line: 1\">LIST ARCHIVELOG ALL FOR DB_UNIQUE_NAME 'DBIT121_SITE2';\nREPORT SCHEMA FOR DB_UNIQUE_NAME 'DBIT121_SITE2';\nSHOW ALL FOR DB_UNIQUE_NAME 'DBIT121_SITE2';<\/pre>\n<p>But getting back to my issue. I was running a resync catalog from my Standby database and ended up with the following error:<\/p>\n<pre class=\"brush: actionscript3; gutter: true; first-line: 1\">RMAN&gt; RESYNC CATALOG FROM DB_UNIQUE_NAME 'DBIT121_SITE1';\n\nresyncing from database with DB_UNIQUE_NAME DBIT121_SITE1\nRMAN-00571: ===========================================================\nRMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============\nRMAN-00571: ===========================================================\nRMAN-03009: failure of resync from db_unique_name command on default channel at 02\/21\/2017 13:08:42\nRMAN-20005: target database name is ambiguous<\/pre>\n<p>RMAN says that the target database name is ambiguous. But what does this mean. Let&#8217;s take a look a the RMAN error with the oerr utility. The oerr utility\u00a0can not only be used with &#8220;ORA&#8221; error codes like &#8220;oerr ora 01555&#8221;, but also with &#8220;RMAN&#8221; error codes.<\/p>\n<pre class=\"brush: actionscript3; gutter: true; first-line: 1\">$ oerr rman 20005\n20005, 1, \"target database name is ambiguous\"\n\/\/ *Cause: two or more databases in the recovery catalog match this name\n\/\/ *Action:\n\/\/<\/pre>\n<p>Ok. This error is much more precise. Looks like that RMAN found more the one database called DBIT121 in the catalog, and so RMAN does not know, on which DBID to perform the requested command. Ok. So let&#8217;s connect to the RMAN catalog and check if this is really the case.<\/p>\n<pre class=\"brush: actionscript3; gutter: true; first-line: 1\">SQL&gt; SELECT DB.DB_KEY,DB.DB_ID, DB.CURR_DBINC_KEY, DBINC.DB_NAME\n        FROM DB, DBINC\n       WHERE DB.CURR_DBINC_KEY = DBINC.DBINC_KEY\n         AND DBINC.DB_NAME   = 'DBIT121' ;  2    3    4\n\n    DB_KEY      DB_ID CURR_DBINC_KEY DB_NAME\n---------- ---------- -------------- --------\n         1  642589239              2 DBIT121\n    546780  644484523         546781 DBIT121<\/pre>\n<p>Indeed. I do have two different DBID&#8217;s pointing to the same DB_NAME. Kinda confusing for RMAN. But which one is the one that have been backed up. We could query the RC_BACKUP_SET and RC_BACKUP_PIECE views to find that out.<\/p>\n<pre class=\"brush: actionscript3; gutter: true; first-line: 1\">SQL&gt; SELECT RBS.DB_KEY\n         , RD.NAME\n         , RBS.DB_ID\n  2    3    4           , RBS.BS_KEY\n         , RBS.RECID\n         , RBS.STAMP\n         , RBS.BACKUP_TYPE\n         , RBS.START_TIME, STATUS\n  5    6    7    8    9        FROM RC_BACKUP_SET RBS, RC_DATABASE RD\n     WHERE RBS.DB_KEY=RD.DB_KEY\n       AND RBS.DB_ID=RD.DBID\n       AND RD.NAME='DBIT121' ;  10   11   12\n...\n...\n\n    DB_KEY NAME          DB_ID     BS_KEY      RECID      STAMP B START_TIM S\n---------- -------- ---------- ---------- ---------- ---------- - --------- -\n    546780 DBIT121   644484523     555608       3070  936496831 I 21-FEB-17 A\n    546780 DBIT121   644484523     555609       3071  936496832 I 21-FEB-17 A\n    546780 DBIT121   644484523     555610       3072  936496836 D 21-FEB-17 A\n    546780 DBIT121   644484523     555611       3073  936496860 D 21-FEB-17 A\n    546780 DBIT121   644484523     555612       3074  936496875 D 21-FEB-17 A\n    546780 DBIT121   644484523     555613       3075  936496884 D 21-FEB-17 A\n    546780 DBIT121   644484523     555614       3076  936496890 D 21-FEB-17 A\n    546780 DBIT121   644484523     555615       3077  936496895 L 21-FEB-17 A\n    546780 DBIT121   644484523     555616       3078  936496897 L 21-FEB-17 A\n    546780 DBIT121   644484523     555617       3079  936496897 L 21-FEB-17 A\n    546780 DBIT121   644484523     555618       3080  936496898 D 21-FEB-17 A\n\n    DB_KEY NAME          DB_ID     BS_KEY      RECID      STAMP B START_TIM S\n---------- -------- ---------- ---------- ---------- ---------- - --------- -\n    546780 DBIT121   644484523     555619       3081  936496900 D 21-FEB-17 A\n    546780 DBIT121   644484523     555620       3082  936498788 D 21-FEB-17 A\n    546780 DBIT121   644484523     555621       3083  936502389 D 21-FEB-17 A\n    546780 DBIT121   644484523     555622       3084  936505991 D 21-FEB-17 A\n    546780 DBIT121   644484523     555623       3085  936509589 D 21-FEB-17 A\n    546780 DBIT121   644484523     555624       3086  936513189 D 21-FEB-17 A\n    546780 DBIT121   644484523     555625       3087  936516788 D 21-FEB-17 A\n    546780 DBIT121   644484523     555626       3088  936520387 D 21-FEB-17 A\n    546780 DBIT121   644484523     555627       3089  936523988 D 21-FEB-17 A\n    546780 DBIT121   644484523     555628       3090  936527608 D 21-FEB-17 A\n    546780 DBIT121   644484523     555629       3091  936531188 D 21-FEB-17 A\n...\n...<\/pre>\n<p>After checking the output, I see that DBID 644484523 is the correct one, and DBID 642589239 is the one I want to get rid of.<\/p>\n<p>To do so, we can shutdown the Standby database and start it up with nomount. The reason for that, is that you can&#8217;t issue the SET DBID command against a database which is mounted or open.<\/p>\n<pre class=\"brush: actionscript3; gutter: true; first-line: 1\">RMAN&gt; SET DBID=642589239;\n\nexecuting command: SET DBID\nRMAN-00571: ===========================================================\nRMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============\nRMAN-00571: ===========================================================\nRMAN-03002: failure of set command at 02\/21\/2017 13:15:26\nRMAN-06188: cannot use command when connected to a mounted target database<\/pre>\n<p>Ok. Let&#8217;s go the nomount and execute the &#8220;unregister database;&#8221; command after the correct DBID is set.<\/p>\n<pre class=\"brush: actionscript3; gutter: true; first-line: 1\">$ rman target sys\/welcome1 catalog \/@rcat\n\nRecovery Manager: Release 12.1.0.2.0 - Production on Tue Feb 21 14:25:10 2017\nCopyright (c) 1982, 2014, Oracle and\/or its affiliates.  All rights reserved.\n\nconnected to target database: DBIT121 (not mounted)\nconnected to recovery catalog database\n\nRMAN&gt; SET DBID=642589239;\n\nexecuting command: SET DBID\ndatabase name is \"DBIT121\" and DBID is 642589239\n\nRMAN&gt; unregister database;\n\ndatabase name is \"DBIT121\" and DBID is 642589239\n\nDo you really want to unregister the database (enter YES or NO)? YES\ndatabase unregistered from the recovery catalog\n\nRMAN&gt;<\/pre>\n<p>Let&#8217;s check the RMAN catalog again.<\/p>\n<pre class=\"brush: actionscript3; gutter: true; first-line: 1\">SQL&gt; SELECT DB.DB_KEY, DB.DB_ID, DB.CURR_DBINC_KEY, DBINC.DB_NAME\n        FROM DB, DBINC\n       WHERE DB.CURR_DBINC_KEY = DBINC.DBINC_KEY\n         AND DBINC.DB_NAME   = 'DBIT121' ;  2    3    4\n\n    DB_KEY      DB_ID CURR_DBINC_KEY DB_NAME\n---------- ---------- -------------- --------\n    556718  644484523         556719 DBIT121<\/pre>\n<p>Cool. Looks much better. \ud83d\ude42 Now my resync catalog from SITE1 issued from SITE2 works again.<\/p>\n<pre class=\"brush: actionscript3; gutter: true; first-line: 1\">RMAN&gt; LIST DB_UNIQUE_NAME OF DATABASE;\n\nList of Databases\nDB Key  DB Name  DB ID            Database Role    Db_unique_name\n------- ------- ----------------- ---------------  ------------------\n556718  DBIT121  644484523        PRIMARY          DBIT121_SITE1\n556718  DBIT121  644484523        STANDBY          DBIT121_SITE2\n\nRMAN&gt; RESYNC CATALOG FROM DB_UNIQUE_NAME 'DBIT121_SITE1';\n\nresyncing from database with DB_UNIQUE_NAME DBIT121_SITE1\nstarting full resync of recovery catalog\nfull resync complete<\/pre>\n<h3>Conclusion<\/h3>\n<p>The RMAN DB_UNIQUE_NAME persistent setting is a quite cool feature. This is something I would really recommend when working with RMAN and Data Guard. It allows you to do actions on primary from the standby or the standby from the primary. It doesn&#8217;t matter. But take care that you don&#8217;t have multiple DBID&#8217;s pointing to the same DB in your RMAN catalog.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>By William Sescu I do have a Data Guard environment, where I have configured the RMAN DB_UNIQUE_NAME persistent setting for my primary and the standby. With the RMAN DB_UNIQUE_NAME settings I am able to run reports my Oracle Data Guard environment from any database. I could e.g. list all archivelogs for SITE1 from SITE2 or [&hellip;]<\/p>\n","protected":false},"author":27,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[229,198],"tags":[209,270],"type_dbi":[],"class_list":["post-9799","post","type-post","status-publish","format-standard","hentry","category-database-administration-monitoring","category-database-management","tag-oracle-12c","tag-rman"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Oracle 12c - How to correct the error: &quot;RMAN-20005: target database name is ambiguous&quot; - dbi Blog<\/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.dbi-services.com\/blog\/oracle-12c-how-to-correct-the-error-rman-20005-target-database-name-is-ambiguous\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Oracle 12c - How to correct the error: &quot;RMAN-20005: target database name is ambiguous&quot;\" \/>\n<meta property=\"og:description\" content=\"By William Sescu I do have a Data Guard environment, where I have configured the RMAN DB_UNIQUE_NAME persistent setting for my primary and the standby. 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