{"id":10673,"date":"2017-11-28T13:51:51","date_gmt":"2017-11-28T12:51:51","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/dataguard-quizz-on-snapshot-standby\/"},"modified":"2023-06-08T16:37:42","modified_gmt":"2023-06-08T14:37:42","slug":"dataguard-quizz-on-snapshot-standby","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/dataguard-quizz-on-snapshot-standby\/","title":{"rendered":"Dataguard: QUIZZ on Snapshot Standby"},"content":{"rendered":"

By Mouhamadou Diaw<\/strong><\/p>\n

In oracle documentation we can find this about snapshot standby: A snapshot standby database is a fully updatable standby database that provides disaster recovery and data protection benefits that are similar to those of a physical standby database.<\/em><\/p>\n

The concept of snapshot standby is that we can temporary convert a physical standby to an updatable database for different purposes and then convert back to a physical standby. During the time that the database is a snapshot standby, it can be used as a normal read write database. And then after the flashback technology is used combined with archived logfiles to convert back the snapshot to a physical standby.
\nIn this blog I have tested some common tasks on a snapshot database and I am describing below the results.<\/p>\n

We show our configuration, oracle 12.2 is used.
\nORCL_SITE<\/strong>: Primary
\nORCL_SITE2<\/strong>: Physical Standby
\nORCL_SITE2<\/strong>: Physical Standby
\nORCL_SITE3<\/strong>: Logical Standby<\/p>\n


\nDGMGRL> show configuration;
\n.
\nConfiguration - ORCL_DR
\n.
\nProtection Mode: MaxPerformance
\nMembers:
\nORCL_SITE - Primary database
\nORCL_SITE1 - Physical standby database
\nORCL_SITE2 - Physical standby database
\nORCL_SITE3 - Logical standby database
\n.
\nFast-Start Failover: DISABLED
\n.
\nConfiguration Status:
\nSUCCESS (status updated 42 seconds ago)
\n.
\nDGMGRL>
\n<\/code>
\nThe first question we can ask is which type of standby can be converted to a snapshot database<\/p>\n

1- Can we convert a logical standby to a snapshot standby<\/strong>
\nLet\u2019s convert our logical standby to a snapshot standby
\n
\nDGMGRL> CONVERT DATABASE 'ORCL_SITE3' TO SNAPSHOT STANDBY;
\nConverting database \"ORCL_SITE3\" to a Snapshot Standby database, please wait...
\nError: ORA-16831: operation not allowed on this member
\n.
\nFailed.
\nFailed to convert database \"ORCL_SITE3\"
\nDGMGRL>
\n<\/code><\/p>\n

Answer<\/strong>: NO we cannot convert a logical standby to a snapshot standby<\/p>\n

2- Can we convert a physical standby to a snapshot standby<\/strong>
\nLet\u2019s convert our physical standby to a snapshot standby
\n
\nDGMGRL> CONVERT DATABASE 'ORCL_SITE2' TO SNAPSHOT STANDBY;
\nConverting database \"ORCL_SITE2\" to a Snapshot Standby database, please wait...
\nDatabase \"ORCL_SITE2\" converted successfully
\nDGMGRL>
\n<\/code>
\nAnd we can verify the new status of the database ‘ORCL_SITE2’
\n
\nDGMGRL> show database 'ORCL_SITE2';
\n.
\nDatabase - ORCL_SITE2
\n.
\nRole: SNAPSHOT STANDBY
\nTransport Lag: 0 seconds (computed 1 second ago)
\nApply Lag: 1 minute 33 seconds (computed 1 second ago)
\nInstance(s):
\nORCL
\n.
\nDatabase Status:
\nSUCCESS
\n.
\nDGMGRL>
\n.
\n<\/code>
\nAnswer<\/strong>: Yes we can convert a physical standby to a snapshot standby.<\/p>\n

Now that the physical is converted to a snapshot let\u2019s continue our quizz.<\/p>\n

3- Can we open a snapshot standby on a read only mode<\/strong>
\nLet\u2019s shutdown our standby snapshot and let\u2019s open it on read only mode
\n
\nSQL> startup open read only;
\nORACLE instance started.
\n.
\nTotal System Global Area 943718400 bytes
\nFixed Size 8627440 bytes
\nVariable Size 348130064 bytes
\nDatabase Buffers 583008256 bytes
\nRedo Buffers 3952640 bytes
\nDatabase mounted.
\nDatabase opened.
\n<\/code>
\nThe status is now open read only
\n
\nSQL> select db_unique_name,database_role,open_mode from v$database;
\n.
\nDB_UNIQUE_NAME DATABASE_ROLE OPEN_MODE
\n------------------------------ ---------------- --------------------
\nORCL_SITE2 SNAPSHOT STANDBY READ ONLY
\n<\/code><\/p>\n

Answer<\/strong>: Yes a snapshot standby can be opened in a READ ONLY mode<\/p>\n

4- Can we create a tablespace on a snapshot standby<\/strong>
\nConnected to the standby database let\u2019s create a tablespace
\n
\nSQL> create tablespace mytab_snap datafile '\/u01\/app\/oracle\/oradata\/ORCL\/mytab_snap01.dbf' size 2M autoextend on maxsize 10M;
\n.
\nTablespace created.
\n<\/code>
\nWe can verify in the table dba_tablespaces
\n
\nSQL> select tablespace_name from dba_tablespaces;
\n.
\nTABLESPACE_NAME
\n------------------------------
\nSYSTEM
\nSYSAUX
\nUNDOTBS1
\nTEMP
\nUSERS
\nMYTAB_SNAP
\nTAB_TEST
\n<\/code>
\nAnswer<\/strong>: Yes we can see that the tablespace MYTAB_SNAP was created.<\/p>\n

5- Can we drop a tablespace on a snapshot standby<\/strong>
\nLet’s drop a tablespace
\nSQL> drop tablespace TAB_TEST including contents and datafiles;
\ndrop tablespace TAB_TEST including contents and datafiles
\n*
\nERROR at line 1:
\nORA-38881: Cannot drop tablespace TAB_TEST on primary database due to
\nguaranteed restore points.
\n<\/code><\/p>\n

Answer<\/strong>: No due to guaranteed restore point, we cannot drop a tablespace on a snapshot database.<\/p>\n

6- Can we extend a datafile on a snapshot standby<\/strong>
\nWe are going to consider two types of datafiles.
\n\u2022 One from tablespace MYTAB_SNAP created on the snapshot standby
\n\u2022 Another from tablespace TAB_TEST created on the primary
\n
\nFILE_NAME TABLESPACE_NAME
\n-------------------------------------------------- ------------------------------
\n\/u01\/app\/oracle\/oradata\/ORCL\/users01.dbf USERS
\n\/u01\/app\/oracle\/oradata\/ORCL\/undotbs01.dbf UNDOTBS1
\n\/u01\/app\/oracle\/oradata\/ORCL\/system01.dbf SYSTEM
\n\/u01\/app\/oracle\/oradata\/ORCL\/sysaux01.dbf SYSAUX
\n\/u01\/app\/oracle\/oradata\/ORCL\/stab_test.dbf TAB_TEST
\n\/u01\/app\/oracle\/oradata\/ORCL\/mytab_snap01.dbf MYTAB_SNAP
\n<\/code><\/p>\n

Let\u2019s extend first the datafile created on the snapshot standby
\n
\nSQL> alter database datafile '\/u01\/app\/oracle\/oradata\/ORCL\/mytab_snap01.dbf' resize 20M;
\n.
\nDatabase altered.
\n<\/code><\/p>\n

And then let\u2019s do the same operation on the datafile created on the primary
\n
\nSQL> alter database datafile '\/u01\/app\/oracle\/oradata\/ORCL\/stab_test.dbf' resize 20M;
\n.
\nDatabase altered.
\n<\/code><\/p>\n

We can verify the new sizes
\n
\nSQL> select FILE_NAME,sum(BYTES) from dba_data_files group by FILE_NAME;
\n.
\nFILE_NAME SUM(BYTES)
\n-------------------------------------------------- ----------
\n\/u01\/app\/oracle\/oradata\/ORCL\/users01.dbf 5242880
\n\/u01\/app\/oracle\/oradata\/ORCL\/undotbs01.dbf 73400320
\n\/u01\/app\/oracle\/oradata\/ORCL\/system01.dbf 870318080
\n\/u01\/app\/oracle\/oradata\/ORCL\/sysaux01.dbf 587202560
\n\/u01\/app\/oracle\/oradata\/ORCL\/stab_test.dbf 20971520
\n\/u01\/app\/oracle\/oradata\/ORCL\/mytab_snap01.dbf 20971520
\n.
\n6 rows selected.
\n<\/code><\/p>\n

Answer<\/strong>: Yes we can extend datafiles on a snapshot standby.<\/p>\n

Just note that when the snapshot standby is converted back to a physical, the datafile is shrinked until his previous size.<\/em><\/p>\n

7- Can we reduce a datafile on a standby database<\/strong>
\nLet\u2019s now reduce the size of the datafile created on the snapshot
\n
\nSQL> alter database datafile '\/u01\/app\/oracle\/oradata\/ORCL\/mytab_snap01.dbf' resize 5M;
\n.
\nDatabase altered.
\n<\/code>
\nAnd let\u2019s do the same operation on the datafile created on the primary
\n
\nSQL> alter database datafile '\/u01\/app\/oracle\/oradata\/ORCL\/stab_test.dbf' resize 5M;
\nalter database datafile '\/u01\/app\/oracle\/oradata\/ORCL\/stab_test.dbf' resize 5M
\n*
\nERROR at line 1:
\nORA-38883: Cannot shrink data file \/u01\/app\/oracle\/oradata\/ORCL\/stab_test.dbf
\non primary database due to guaranteed restore points.
\n<\/code><\/p>\n

Answer<\/strong>: Yes we see that we can only reduce size for datafiles created on the snapshot standby.<\/p>\n

8- Can we do a switchover to a snapshot standby<\/strong>
\nAs a snapshot is a physical standby which was converted, one may ask if a switchover is possible to a snapshot standby.
\n
\nDGMGRL> switchover to 'ORCL_SITE2';
\nPerforming switchover NOW, please wait...
\nError: ORA-16831: operation not allowed on this member
\n.
\nFailed.
\nUnable to switchover, primary database is still \"ORCL_SITE\"
\nDGMGRL>
\n<\/code><\/p>\n

Answer<\/strong>: No we cannot do a switchover to a snapshot standby.<\/p>\n

9- Can we do a failover to a snapshot standby <\/strong>
\nThe same question can be asked about failover.
\n
\nDGMGRL> connect sys\/root@ORCL_SITE2
\nConnected to \"ORCL_SITE2\"
\nConnected as SYSDBA.
\nDGMGRL> failover to 'ORCL_SITE2';
\nConverting database \"ORCL_SITE2\" to a Physical Standby database, please wait...
\nOperation requires shut down of instance \"ORCL\" on database \"ORCL_SITE2\"
\nShutting down instance \"ORCL\"...
\nConnected to \"ORCL_SITE2\"
\nDatabase closed.
\nDatabase dismounted.
\nORACLE instance shut down.
\nOperation requires start up of instance \"ORCL\" on database \"ORCL_SITE2\"
\nStarting instance \"ORCL\"...
\nORACLE instance started.
\nDatabase mounted.
\nConnected to \"ORCL_SITE2\"
\nConnected to \"ORCL_SITE2\"
\nContinuing to convert database \"ORCL_SITE2\" ...
\nDatabase \"ORCL_SITE2\" converted successfully
\nPerforming failover NOW, please wait...
\nFailover succeeded, new primary is \"ORCL_SITE2\"
\nDGMGRL>
\n<\/code><\/p>\n

Answer<\/strong>: Yes, we can do a failover to a snapshot standby but the time of the failover is longer than if the failover was done to a physical standby. Indeed oracle has<\/p>\n

\u2022 Convert the snapshot to physical standby one
\n\u2022 Applied archived logs to the physical standby
\n\u2022 And then do the failover<\/p>\n

Conclusion<\/strong>: In this blog, we tried to explain some behaviors of snapshot standby. Hope that this article may help<\/p>\n","protected":false},"excerpt":{"rendered":"

By Mouhamadou Diaw In oracle documentation we can find this about snapshot standby: A snapshot standby database is a fully updatable standby database that provides disaster recovery and data protection benefits that are similar to those of a physical standby database. The concept of snapshot standby is that we can temporary convert a physical standby […]<\/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],"tags":[1196,511,988,1234,1235],"type_dbi":[],"class_list":["post-10673","post","type-post","status-publish","format-standard","hentry","category-database-administration-monitoring","tag-dataguard-12-2","tag-failover","tag-oracle-12-2","tag-standby-database","tag-swithover"],"acf":[],"yoast_head":"\nDataguard: QUIZZ on Snapshot Standby - dbi Blog<\/title>\n<meta name=\"description\" content=\"snapshot database, oracle 12.2, dataguard\" \/>\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\/dataguard-quizz-on-snapshot-standby\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Dataguard: QUIZZ on Snapshot Standby\" \/>\n<meta property=\"og:description\" content=\"snapshot database, oracle 12.2, dataguard\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.dbi-services.com\/blog\/dataguard-quizz-on-snapshot-standby\/\" \/>\n<meta property=\"og:site_name\" content=\"dbi Blog\" \/>\n<meta property=\"article:published_time\" content=\"2017-11-28T12:51:51+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-06-08T14:37:42+00:00\" \/>\n<meta name=\"author\" content=\"Oracle Team\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Oracle Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/dataguard-quizz-on-snapshot-standby\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/dataguard-quizz-on-snapshot-standby\/\"},\"author\":{\"name\":\"Oracle Team\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/66ab87129f2d357f09971bc7936a77ee\"},\"headline\":\"Dataguard: QUIZZ on Snapshot Standby\",\"datePublished\":\"2017-11-28T12:51:51+00:00\",\"dateModified\":\"2023-06-08T14:37:42+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/dataguard-quizz-on-snapshot-standby\/\"},\"wordCount\":672,\"commentCount\":0,\"keywords\":[\"Dataguard 12.2\",\"failover\",\"Oracle 12.2\",\"standby database\",\"swithover\"],\"articleSection\":[\"Database Administration & Monitoring\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.dbi-services.com\/blog\/dataguard-quizz-on-snapshot-standby\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/dataguard-quizz-on-snapshot-standby\/\",\"url\":\"https:\/\/www.dbi-services.com\/blog\/dataguard-quizz-on-snapshot-standby\/\",\"name\":\"Dataguard: QUIZZ on Snapshot Standby - 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