{"id":14204,"date":"2020-05-28T06:59:45","date_gmt":"2020-05-28T04:59:45","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/applying-archive-log-on-a-standby-is-failing-with-error-ora-00756-recovery-detected-a-lost-write-of-a-data-block\/"},"modified":"2020-05-28T06:59:45","modified_gmt":"2020-05-28T04:59:45","slug":"applying-archive-log-on-a-standby-is-failing-with-error-ora-00756-recovery-detected-a-lost-write-of-a-data-block","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/applying-archive-log-on-a-standby-is-failing-with-error-ora-00756-recovery-detected-a-lost-write-of-a-data-block\/","title":{"rendered":"Applying archive log on a standby is failing with error ORA-00756: recovery detected a lost write of a data block"},"content":{"rendered":"<p>During one last ODA project, I was deploying dbvisit software version 9.0.10 on Oracle database SE Edition version 18.7. From time to time I was getting lost write of a data block with type KTU UNDO on the standby. Through this blog, I would like to share my investigation and experience on this subject.<\/p>\n<p><!--more--><\/p>\n<h3>Problem description<\/h3>\n<p>Applying archive log on a standby database will generate following output :<br \/>\n<code>PID:80969<br \/>\nTRACEFILE:80969_dbvctl_DBTEST_202005141045.trc<br \/>\nSERVER:ODA01<br \/>\nERROR_CODE:2001<br \/>\nORA-00756: recovery detected a lost write of a data block<\/code><\/p>\n<p>The full dbvisit output is the following one :<br \/>\n<code>oracle@ODA01:\/u01\/app\/dbvisit\/standby\/ [rdbms18000_1] <strong>.\/dbvctl -d DBTEST<\/strong><br \/>\n=============================================================<br \/>\nDbvisit Standby Database Technology (9.0.10_0_g064b53e) (pid 80969)<br \/>\ndbvctl started on ODA01: Thu May 14 10:45:24 2020<br \/>\n=============================================================<br \/>\n&nbsp;<br \/>\n&nbsp;<br \/>\n&gt;&gt;&gt; Applying Log file(s) from ODA02 to TESTDB on ODA01:<br \/>\n&nbsp;<br \/>\n    thread 1 sequence 8258 (1_8258_1033287237.arc)... done<br \/>\n    thread 1 sequence 8259 (1_8259_1033287237.arc)... done<br \/>\n...<br \/>\n...<br \/>\n...<br \/>\n&nbsp;<br \/>\n&lt;&lt;&lt;&gt;&gt;&gt;<br \/>\nPID:80969<br \/>\nTRACEFILE:80969_dbvctl_SALESPRD_202005141045.trc<br \/>\nSERVER:SEERP1SOP011-replica<br \/>\nERROR_CODE:2001<br \/>\nORA-00756: Recovery hat einen verlorenen Schreibvorgang eines Datenblockes ermittelt<br \/>\n&nbsp;<br \/>\n&nbsp;<br \/>\n&gt;&gt;&gt;&gt; Dbvisit Standby terminated &lt;&lt;&lt;&lt;<\/code><\/p>\n<ol>Note that this problem could also be faced :<\/p>\n<li>during Data Guard MRP Recovery process<\/li>\n<li>doing a restore\/recover of a database with RMAN<\/li>\n<\/ol>\n<p>The consequence was that no more archive log could be applied on the standby.<\/p>\n<h3>Troubleshooting<\/h3>\n<h4>Alert log and trace file<\/h4>\n<p>In the alert log following errors could be found :<br \/>\n<code>Additional information: 7<br \/>\nORA-10567: Redo is inconsistent with data block (file# 7, block# 3483690, file offset is 2768584704 bytes)<br \/>\nORA-10564: tablespace UNDOTBS1<br \/>\nORA-01110: Datendatei 7: '\/u02\/app\/oracle\/oradata\/DBTEST_DC13\/DBTEST_DC13\/datafile\/o1_mf_undotbs1_h59nykn5_.dbf'<br \/>\n<strong>ORA-10560: block type 'KTU UNDO BLOCK<\/strong>'<br \/>\n2020-05-14T10:56:46.756001+02:00<br \/>\nERROR: ORA-00756 detected lost write of a data block<br \/>\nRecovery interrupted!<\/code><\/p>\n<p>Following errors was displayed in the trace file :<br \/>\n<code>oracle@ODA01:\/u01\/app\/oracle\/diag\/rdbms\/dbtest_dc13\/DBTEST\/trace\/ [DBTEST] <strong>grep \"KCOX_FUTURE\" *<\/strong><br \/>\nDBTEST_ora_10502.trc:KCOX_FUTURE: CHANGE IN FUTURE OF BLOCK<br \/>\nDBTEST _ora_20942.trc:KCOX_FUTURE: CHANGE IN FUTURE OF BLOCK<br \/>\nDBTEST _ora_22282.trc:KCOX_FUTURE: CHANGE IN FUTURE OF BLOCK<br \/>\nDBTEST _ora_22525.trc:KCOX_FUTURE: CHANGE IN FUTURE OF BLOCK<br \/>\nDBTEST _ora_37658.trc:KCOX_FUTURE: CHANGE IN FUTURE OF BLOCK<br \/>\nDBTEST _ora_4482.trc:KCOX_FUTURE: CHANGE IN FUTURE OF BLOCK<br \/>\nDBTEST _ora_50411.trc:KCOX_FUTURE: CHANGE IN FUTURE OF BLOCK<br \/>\nDBTEST _ora_56399.trc:KCOX_FUTURE: CHANGE IN FUTURE OF BLOCK<br \/>\nDBTEST _ora_64093.trc:KCOX_FUTURE: CHANGE IN FUTURE OF BLOCK<br \/>\nDBTEST _ora_67930.trc:KCOX_FUTURE: CHANGE IN FUTURE OF BLOCK<br \/>\nDBTEST _ora_78658.trc:KCOX_FUTURE: CHANGE IN FUTURE OF BLOCK<br \/>\nDBTEST _ora_80717.trc:KCOX_FUTURE: CHANGE IN FUTURE OF BLOCK<br \/>\nDBTEST _ora_91154.trc:KCOX_FUTURE: CHANGE IN FUTURE OF BLOCK<br \/>\nDBTEST _ora_9180.trc:KCOX_FUTURE: CHANGE IN FUTURE OF BLOCK<br \/>\nDBTEST _ora_95242.trc:KCOX_FUTURE: CHANGE IN FUTURE OF BLOCK<\/code><\/p>\n<h4>Checking corruption<\/h4>\n<ol>Checking corruption, we can see that :<\/p>\n<li>There is no block corruption<\/li>\n<li>The corruption is only raised on UNDO blocks<\/li>\n<\/ol>\n<p><code>oracle@ODA01:\/home\/oracle\/ [DBTEST] <strong>rmanh<\/strong><br \/>\n&nbsp;<br \/>\nRecovery Manager: Release 18.0.0.0.0 - Production on Tue May 12 16:28:28 2020<br \/>\nVersion 18.7.0.0.0<br \/>\n&nbsp;<br \/>\nCopyright (c) 1982, 2018, Oracle and\/or its affiliates.  All rights reserved.<br \/>\n&nbsp;<br \/>\nRMAN&gt; <strong>connect target \/<\/strong><br \/>\n&nbsp;<br \/>\nconnected to target database: DBTEST (DBID=3596833858, not open)<br \/>\n&nbsp;<br \/>\nRMAN&gt; <strong>validate check logical datafile 7;<\/strong><br \/>\n&nbsp;<br \/>\nStarting validate at 12-MAY-2020 16:28:44<br \/>\nusing target database control file instead of recovery catalog<br \/>\nallocated channel: ORA_DISK_1<br \/>\nchannel ORA_DISK_1: SID=396 device type=DISK<br \/>\nchannel ORA_DISK_1: starting validation of datafile<br \/>\nchannel ORA_DISK_1: specifying datafile(s) for validation<br \/>\ninput datafile file number=00007 name=\/u02\/app\/oracle\/oradata\/DBTEST_DC13\/DBTEST_DC13\/datafile\/o1_mf_undotbs1_h59nykn5_.dbf<br \/>\nchannel ORA_DISK_1: validation complete, elapsed time: 00:00:15<br \/>\nList of Datafiles<br \/>\n=================<br \/>\nFile Status Marked Corrupt Empty Blocks Blocks Examined High SCN<br \/>\n---- ------ -------------- ------------ --------------- ----------<br \/>\n7    OK     0              1            3932160         818750393<br \/>\n  File Name: \/u02\/app\/oracle\/oradata\/DBTEST_DC13\/DBTEST_DC13\/datafile\/o1_mf_undotbs1_h59nykn5_.dbf<br \/>\n  Block Type Blocks Failing Blocks Processed<br \/>\n  ---------- -------------- ----------------<br \/>\n  Data       0              0<br \/>\n  Index      0              0<br \/>\n  Other      0              3932159<br \/>\n&nbsp;<br \/>\nFinished validate at 12-MAY-2020 16:29:00<br \/>\n&nbsp;<br \/>\nRMAN&gt; <strong>select * from V$DATABASE_BLOCK_CORRUPTION;<\/strong><br \/>\n&nbsp;<br \/>\nno rows selected<br \/>\n&nbsp;<br \/>\nRMAN&gt;<\/code><\/p>\n<h3>Root cause<\/h3>\n<p>This is a known 11.2.0.4 bug that affects 18.7 as well: Bug 21629064 &#8211; ORA-600 [3020] KCOX_FUTURE by RECOVERY for KTU UNDO BLOCK SEQ:254 sometime after RMAN Restore of UNDO datafile in Source Database (Doc ID 21629064.8)<\/p>\n<h3>Workaround<\/h3>\n<p>On both primary and standby databases set _undo_block_compression hidden parameter to false.<br \/>\n<code>SQL&gt; <strong>alter system set \"_undo_block_compression\"=FALSE scope=both;<\/strong><br \/>\n&nbsp;<br \/>\nSystem wurde geandert.<br \/>\n&nbsp;<br \/>\nSQL&gt;<\/code><\/p>\n<p>Knowing this is a hidden parameter, I would recommend you to open an Oracle SR before setting it to your database. Neither the author (that\u2019s me &#x1f642; ) nor dbi services &#x1f609; would be responsible for any issue or consequence following commands described in this blog. This would be your own responsability. &#x1f609;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>During one last ODA project, I was deploying dbvisit software version 9.0.10 on Oracle database SE Edition version 18.7. From time to time I was getting lost write of a data block with type KTU UNDO on the standby. Through this blog, I would like to share my investigation and experience on this subject.<\/p>\n","protected":false},"author":48,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[229,198,59],"tags":[372,1961,1962,96],"type_dbi":[],"class_list":["post-14204","post","type-post","status-publish","format-standard","hentry","category-database-administration-monitoring","category-database-management","category-oracle","tag-dbvisit","tag-ora-00756","tag-ora-10560","tag-oracle"],"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>Applying archive log on a standby is failing with error ORA-00756: recovery detected a lost write of a data block - 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\/applying-archive-log-on-a-standby-is-failing-with-error-ora-00756-recovery-detected-a-lost-write-of-a-data-block\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Applying archive log on a standby is failing with error ORA-00756: recovery detected a lost write of a data block\" \/>\n<meta property=\"og:description\" content=\"During one last ODA project, I was deploying dbvisit software version 9.0.10 on Oracle database SE Edition version 18.7. 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