{"id":21174,"date":"2023-01-27T11:31:38","date_gmt":"2023-01-27T10:31:38","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/?p=21174"},"modified":"2023-01-27T11:31:39","modified_gmt":"2023-01-27T10:31:39","slug":"seha-on-oda","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/seha-on-oda\/","title":{"rendered":"SEHA on ODA?"},"content":{"rendered":"\n<p>SEHA means Standard Edition High Availability. SEHA is fully integrated with Oracle Grid Infrastructure starting with Oracle Grid Infrastructure 19c, and more specifically since RU 19.7. SEHA provides then cluster-based failover for single-instance Standard Edition Oracle Databases using Oracle Clustware. It is important to mention that Oracle removed Oracle RAC from SE2 Edition since 19c. <\/p>\n\n\n\n<!--more-->\n\n\n\n<h2 class=\"wp-block-heading\">Most important things to know about SEHA<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>SEHA allows running a database in SE in cluster environment<\/li>\n\n\n\n<li>No RAC functionality (global cache, global enqueue, &#8230;)<\/li>\n\n\n\n<li>SEHA has less functionalities as RAC<\/li>\n\n\n\n<li>2 instances can then not be up at the same time<\/li>\n\n\n\n<li>SEHA will have to shutdown one instance before starting the other node instance<\/li>\n<\/ul>\n\n\n\n<p>Also know that a database in SE Edition with a version lower than 19c and configured in RAC will have to be converted to SEHA configuration as part of the upgrade to Oracle database 19c.<\/p>\n\n\n\n<p>A comparison between SEHA and RAC can be found in this oracle documentation : <a href=\"https:\/\/docs.oracle.com\/en\/database\/oracle\/oracle-database\/19\/cwadd\/introduction-to-oracle-clusterware.html#GUID-C54E2511-24E2-452B-B4C7-0D5A93A751A9\">https:\/\/docs.oracle.com\/en\/database\/oracle\/oracle-database\/19\/<\/a><a href=\"https:\/\/docs.oracle.com\/en\/database\/oracle\/oracle-database\/19\/cwadd\/introduction-to-oracle-clusterware.html#GUID-C54E2511-24E2-452B-B4C7-0D5A93A751A9\" target=\"_blank\" rel=\"noreferrer noopener\">cwadd<\/a><a href=\"https:\/\/docs.oracle.com\/en\/database\/oracle\/oracle-database\/19\/cwadd\/introduction-to-oracle-clusterware.html#GUID-C54E2511-24E2-452B-B4C7-0D5A93A751A9\">\/introduction-to-oracle-clusterware.html#GUID-C54E2511-24E2-452B-B4C7-0D5A93A751A9<\/a><\/p>\n\n\n\n<p>A stated in Markus Michalewicz&#8217;s (Oracle Vice President of Product Management) blog about SEHA (<a href=\"https:\/\/blogs.oracle.com\/maa\/post\/standard-edition-high-availability-released-see-whats-new\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/blogs.oracle.com\/maa\/post\/standard-edition-high-availability-released-see-whats-new<\/a>), SEHA databases can be licensed using the \u201c10-day failover rule\u201d.<\/p>\n\n\n\n<p>Please carefully read the prerequisite of SEHA you can find on this link : <a href=\"https:\/\/docs.oracle.com\/en\/database\/oracle\/oracle-database\/19\/ladbi\/guidelines-for-seha.html#GUID-55EEFB09-B708-4BA5-BA1A-23609FEC6A29\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/docs.oracle.com\/en\/database\/oracle\/oracle-database\/19\/ladbi\/guidelines-for-seha.html#GUID-55EEFB09-B708-4BA5-BA1A-23609FEC6A29<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What about SEHA and ODA?<\/h2>\n\n\n\n<p>SEHA provides cluster-based failover for 19c SE database. When there is an instance or node failure, following scenario will apply:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>There is first an attempt to restart the instance on the local node<\/li>\n\n\n\n<li>Then the database automatically fails over on the other node if needed<\/li>\n\n\n\n<li>This means the database is restarted on the second node<\/li>\n<\/ul>\n\n\n\n<p>Of course SEHA is not possible on ODA light as ODA 2S, 2M, 2L. To be able to take advantage of this functionality we will need an ODA-2-HA model which will come with 2 server nodes, a shared storage and server interconnects.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">My Lab environment<\/h2>\n\n\n\n<p>My lab is running an ODA X5-2-HA.<\/p>\n\n\n\n<p>Node 0 hostname is dbioda02.<\/p>\n\n\n\n<p>Node 1 hostname is dbioda03.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Create a SEHA database on the ODA-2-HA<\/h2>\n\n\n\n<p>A single-instance Oracle 19c SE2 database will be automatically configured in failover mode. High Availability option can of course later be enable or disabled. Both nodes need to host a dbhome in SE edition.<\/p>\n\n\n\n<p>I have a SE dbhome:<\/p>\n\n\n\n<pre class=\"brush: sql; gutter: true; first-line: 1; highlight: [1]\">\n[root@dbioda02 ~]# odacli describe-dbhome -i 5b0b3769-0c05-435e-b7c8-5d295c05934c\nDB Home details\n----------------------------------------------------------------\n                     ID: 5b0b3769-0c05-435e-b7c8-5d295c05934c\n                   Name: OraDB19000_home2\n                Version: 19.15.0.0.220419\n          Home Location: \/u01\/app\/odaorahome\/oracle\/product\/19.0.0.0\/dbhome_2\n                 Status: CONFIGURED\n                Created: January 27, 2023 9:34:03 AM CET\n       Database Edition: SE\n<\/pre>\n<\/br>\n\n\n\n<p>I created a SE Single Instance database named DBISEHA (note the option -y SI):<\/p>\n\n\n\n<pre class=\"brush: sql; gutter: true; first-line: 1; highlight: [1]\">\n[root@dbioda02 ~]# odacli create-database -u DBISEHA -n DBISEHA -dh 5b0b3769-0c05-435e-b7c8-5d295c05934c -y SI -g 0\nEnter SYS and SYSTEM user password:\nRetype SYS and SYSTEM user password:\n\nJob details\n----------------------------------------------------------------\n                     ID:  f47e6f6a-6fcb-422a-8187-b9a2031eae50\n            Description:  Database service creation with db name: DBISEHA\n                 Status:  Created\n                Created:  January 27, 2023 9:41:13 AM CET\n                Message:\n\nTask Name                                Start Time                          End Time                            Status\n---------------------------------------- ----------------------------------- ----------------------------------- ----------\n<\/pre>\n<\/br>\n\n\n\n<p>As we can see, High Availability, so called SEHA, has been automatically configured. Note the field <strong>High Availability<\/strong>:<\/p>\n\n\n\n<pre class=\"brush: sql; gutter: true; first-line: 1; highlight: [1,17]\">\n[root@dbioda02 ~]# odacli describe-database -i bed8b9fb-214a-423e-b0e8-d8c084b45dd1\nDatabase details\n----------------------------------------------------------------\n                     ID: bed8b9fb-214a-423e-b0e8-d8c084b45dd1\n            Description: DBISEHA\n                DB Name: DBISEHA\n             DB Version: 19.15.0.0.220419\n                DB Type: SI\n                DB Role: PRIMARY\n    DB Target Node Name: dbioda02\n             DB Edition: SE\n                   DBID: 1535732728\n Instance Only Database: false\n                    CDB: false\n               PDB Name:\n    PDB Admin User Name:\n      High Availability: true\n                  Class: OLTP\n                  Shape: odb1\n                Storage: ASM\n          DB Redundancy:\n           CharacterSet: AL32UTF8\n  National CharacterSet: AL16UTF16\n               Language: AMERICAN\n              Territory: AMERICA\n                Home ID: 5b0b3769-0c05-435e-b7c8-5d295c05934c\n        Console Enabled: false\n  TDE Wallet Management:\n            TDE Enabled: false\n     Level 0 Backup Day: Sunday\n     AutoBackup Enabled: false\n                Created: January 27, 2023 9:41:13 AM CET\n         DB Domain Name: dbi-lab.ch\n    Associated Networks: Public-network\n          CPU Pool Name:\n<\/pre>\n<\/br>\n\n\n\n<p>We can disable and enable SEHA functionality with following options:<\/p>\n\n\n\n<pre class=\"brush: sql; gutter: true; first-line: 1; highlight: [1]\">\n[root@dbioda02 ~]# odacli modify-database -h | grep seha\n    --disable-seha,-no-sh      Disable SEHA for SE 19c and later SIDB (inverse\n                               option: --enable-seha\/-sh)\n    --enable-seha,-sh          Enable SEHA for SE 19c and later SIDB (inverse\n                               option: --disable-seha\/-no-sh)\n<\/pre>\n<\/br>\n\n\n\n<p>Let&#8217;s deactivate the SEHA functionality:<\/p>\n\n\n\n<pre class=\"brush: sql; gutter: true; first-line: 1; highlight: [1,21,35]\">\n[root@dbioda02 ~]# odacli modify-database -in DBISEHA -no-sh\n{\n  \"jobId\" : \"930d200a-cd29-4f7b-a6b3-5831b1b14ff2\",\n  \"status\" : \"Created\",\n  \"message\" : \"Modify database\",\n  \"reports\" : [ ],\n  \"createTimestamp\" : \"January 27, 2023 10:09:00 AM CET\",\n  \"resourceList\" : [ {\n    \"resourceId\" : \"bed8b9fb-214a-423e-b0e8-d8c084b45dd1\",\n    \"resourceType\" : \"DB\",\n    \"resourceNewType\" : null,\n    \"jobId\" : \"930d200a-cd29-4f7b-a6b3-5831b1b14ff2\",\n    \"updatedTime\" : \"January 27, 2023 10:09:00 AM CET\"\n  } ],\n  \"description\" : \"Modify database : DBISEHA\",\n  \"updatedTime\" : \"January 27, 2023 10:09:00 AM CET\",\n  \"jobType\" : \"\",\n  \"warning\" : \"'--enable-seha\/-sh' option is deprecated, use '--enable-ha\/-ha' instead. '--disable-seha\/-no-sh' option is deprecated, use '--disable-ha\/-no-ha' instead.\"\n}\n\n[root@dbioda02 ~]# odacli describe-job -i 930d200a-cd29-4f7b-a6b3-5831b1b14ff2\n\nJob details\n----------------------------------------------------------------\n                     ID:  930d200a-cd29-4f7b-a6b3-5831b1b14ff2\n            Description:  Modify database : DBISEHA\n                 Status:  Success\n                Created:  January 27, 2023 10:09:00 AM CET\n                Message:  Modify database\n\nTask Name                                Start Time                          End Time                            Status\n---------------------------------------- ----------------------------------- ----------------------------------- ----------\nDisable High availability for database {DBISEHA} January 27, 2023 10:09:02 AM CET    January 27, 2023 10:09:04 AM CET    Success\n\n[root@dbioda02 ~]# odacli describe-database -i bed8b9fb-214a-423e-b0e8-d8c084b45dd1 | grep 'High Availability'\n      High Availability: false\n<\/pre>\n<\/br>\n\n\n\n<p>And reactivate it again:<\/p>\n\n\n\n<pre class=\"brush: sql; gutter: true; first-line: 1; highlight: [1,21,35]\">\n[root@dbioda02 ~]# odacli modify-database -in DBISEHA -sh\n{\n  \"jobId\" : \"4ae27cab-84fa-4204-be8d-37519df75aac\",\n  \"status\" : \"Created\",\n  \"message\" : \"Modify database\",\n  \"reports\" : [ ],\n  \"createTimestamp\" : \"January 27, 2023 10:14:05 AM CET\",\n  \"resourceList\" : [ {\n    \"resourceId\" : \"bed8b9fb-214a-423e-b0e8-d8c084b45dd1\",\n    \"resourceType\" : \"DB\",\n    \"resourceNewType\" : null,\n    \"jobId\" : \"4ae27cab-84fa-4204-be8d-37519df75aac\",\n    \"updatedTime\" : \"January 27, 2023 10:14:05 AM CET\"\n  } ],\n  \"description\" : \"Modify database : DBISEHA\",\n  \"updatedTime\" : \"January 27, 2023 10:14:05 AM CET\",\n  \"jobType\" : \"\",\n  \"warning\" : \"'--enable-seha\/-sh' option is deprecated, use '--enable-ha\/-ha' instead. '--disable-seha\/-no-sh' option is deprecated, use '--disable-ha\/-no-ha' instead.\"\n}\n\n[root@dbioda02 ~]# odacli describe-job -i 4ae27cab-84fa-4204-be8d-37519df75aac\n\nJob details\n----------------------------------------------------------------\n                     ID:  4ae27cab-84fa-4204-be8d-37519df75aac\n            Description:  Modify database : DBISEHA\n                 Status:  Success\n                Created:  January 27, 2023 10:14:05 AM CET\n                Message:  Modify database\n\nTask Name                                Start Time                          End Time                            Status\n---------------------------------------- ----------------------------------- ----------------------------------- ----------\nConfigure All Candidate Nodes            January 27, 2023 10:14:06 AM CET    January 27, 2023 10:14:09 AM CET    Success\n\n[root@dbioda02 ~]# odacli describe-database -i bed8b9fb-214a-423e-b0e8-d8c084b45dd1 | grep 'High Availability'\n      High Availability: true\n[root@dbioda02 ~]#\n<\/pre>\n<\/br>\n\n\n\n<h2 class=\"wp-block-heading\">Relocate a SEHA database<\/h2>\n\n\n\n<p>A Single Instance SE2 database can easily be relocated to other node with odacli modify-database command using the target host name (option &#8211;targethost,-th) or with the node number (option &#8211;targetnode,-g).<\/p>\n\n\n\n<p>As we can see, my DBISEHA database is currently running on my node 0:<\/p>\n\n\n\n<pre class=\"brush: sql; gutter: true; first-line: 1; highlight: [1,7]\">\n[root@dbioda02 ~]# ps -ef | grep [p]mon\noracle     464     1  0 09:54 ?        00:00:00 ora_pmon_DBISEHA\ngrid     45768     1  0  2022 ?        00:05:06 apx_pmon_+APX1\ngrid     63447     1  0  2022 ?        00:04:47 asm_pmon_+ASM1\noracle   86674     1  0  2022 ?        00:05:22 ora_pmon_DBITST1\n\n[root@dbioda03 ~]# ps -ef | grep [p]mon\ngrid     11548     1  0  2022 ?        00:01:54 asm_pmon_+ASM2\ngrid     13397     1  0  2022 ?        00:01:57 apx_pmon_+APX2\noracle   23156     1  0  2022 ?        00:02:13 ora_pmon_DBITST2\n<\/pre>\n<\/br>\n\n\n\n<p>Which is confirmed by ODA Metadata:<\/p>\n\n\n\n<pre class=\"brush: sql; gutter: true; first-line: 1; highlight: [1]\">\n[root@dbioda02 ~]# odacli describe-database -i bed8b9fb-214a-423e-b0e8-d8c084b45dd1 | grep 'DB Target Node Name'\n    DB Target Node Name: dbioda02\n<\/pre>\n<\/br>\n\n\n\n<p>Let&#8217;s relocate the database to the other node:<\/p>\n\n\n\n<pre class=\"brush: sql; gutter: true; first-line: 1; highlight: [1,20]\">\n[root@dbioda02 ~]# odacli modify-database -in DBISEHA -g 1\n{\n  \"jobId\" : \"ab67a8e9-d5bf-40db-b83c-ecff118f5268\",\n  \"status\" : \"Created\",\n  \"message\" : \"Modify database\",\n  \"reports\" : [ ],\n  \"createTimestamp\" : \"January 27, 2023 10:31:03 AM CET\",\n  \"resourceList\" : [ {\n    \"resourceId\" : \"bed8b9fb-214a-423e-b0e8-d8c084b45dd1\",\n    \"resourceType\" : \"DB\",\n    \"resourceNewType\" : null,\n    \"jobId\" : \"ab67a8e9-d5bf-40db-b83c-ecff118f5268\",\n    \"updatedTime\" : \"January 27, 2023 10:31:03 AM CET\"\n  } ],\n  \"description\" : \"Modify database : DBISEHA\",\n  \"updatedTime\" : \"January 27, 2023 10:31:03 AM CET\",\n  \"jobType\" : \"\"\n}\n\n[root@dbioda02 ~]# odacli describe-job -i ab67a8e9-d5bf-40db-b83c-ecff118f5268\n\nJob details\n----------------------------------------------------------------\n                     ID:  ab67a8e9-d5bf-40db-b83c-ecff118f5268\n            Description:  Modify database : DBISEHA\n                 Status:  Success\n                Created:  January 27, 2023 10:31:03 AM CET\n                Message:  Modify database\n\nTask Name                                Start Time                          End Time                            Status\n---------------------------------------- ----------------------------------- ----------------------------------- ----------\nRelocate database {DBISEHA}              January 27, 2023 10:31:04 AM CET    January 27, 2023 10:32:22 AM CET    Success\n<\/pre>\n<\/br>\n\n\n\n<p>We can see with odacli that the database has been relocated and that the current running node is now node 1, dbioda03:<\/p>\n\n\n\n<pre class=\"brush: sql; gutter: true; first-line: 1; highlight: [1]\">\n[root@dbioda02 ~]# odacli describe-database -i bed8b9fb-214a-423e-b0e8-d8c084b45dd1 | grep 'DB Target Node Name'\n    DB Target Node Name: dbioda03\n<\/pre>\n<\/br>\n\n\n\n<p>And we can confirm seeing that the pmon process of the database is now running on node 1:<\/p>\n\n\n\n<pre class=\"brush: sql; gutter: true; first-line: 1; highlight: [1,6]\">\n[root@dbioda02 ~]# ps -ef | grep [p]mon\ngrid     45768     1  0  2022 ?        00:05:06 apx_pmon_+APX1\ngrid     63447     1  0  2022 ?        00:04:47 asm_pmon_+ASM1\noracle   86674     1  0  2022 ?        00:05:22 ora_pmon_DBITST1\n\n[root@dbioda03 ~]# ps -ef | grep [p]mon\ngrid     11548     1  0  2022 ?        00:01:54 asm_pmon_+ASM2\ngrid     13397     1  0  2022 ?        00:01:57 apx_pmon_+APX2\noracle   23156     1  0  2022 ?        00:02:13 ora_pmon_DBITST2\noracle   38465     1  0 10:32 ?        00:00:00 ora_pmon_DBISEHA\n<\/pre>\n<\/br>\n\n\n\n<p>We can also see from both alert logs that, with Oracle SEHA, the running instance is first stopped before the new one is started.<\/p>\n\n\n\n<p>On the running node 0, the instance was stopped and completed at 10:31:28:<\/p>\n\n\n\n<pre class=\"brush: sql; gutter: true; first-line: 1; highlight: [1]\">\n[oracle@dbioda02 trace]$ tail -2 alert_DBISEHA.log\n2023-01-27T10:31:28.200215+01:00\nInstance shutdown complete (OS id: 74061)\n<\/pre>\n<\/br>\n\n\n\n<p>The start of the instance on the new node 1, only started afterwards at 10:31:53:<\/p>\n\n\n\n<pre class=\"brush: sql; gutter: true; first-line: 1; highlight: [1]\">\n[oracle@dbioda03 trace]$ head -2 alert_DBISEHA.log\n2023-01-27T10:31:53.131466+01:00\nStarting ORACLE instance (normal) (OS id: 37772)\n<\/pre>\n<\/br>\n\n\n\n<h2 class=\"wp-block-heading\">What if now node 1 is crashing?<\/h2>\n\n\n\n<p>If we power off node 1, the database DBISEHA will be automatically failovered on node 0.<\/p>\n\n\n\n<p>Let&#8217;s poweroff node 1:<\/p>\n\n\n\n<pre class=\"brush: sql; gutter: true; first-line: 1; highlight: [1,3]\">\n[root@dbioda03 ~]# date\nFri Jan 27 10:55:22 CET 2023\n\n[root@dbioda03 ~]# systemctl poweroff\nConnection to 10.X.X.233 closed by remote host.\nConnection to 10.X.X.233 closed.\n<\/pre>\n<\/br>\n\n\n\n<p>And check that PMON processes for DBISEHA database will be started on node 0:<\/p>\n\n\n\n<pre class=\"brush: sql; gutter: true; first-line: 1; highlight: [1]\">\n[root@dbioda02 ~]# ps -ef | grep [p]mon\noracle   18471     1  0 10:56 ?        00:00:00 ora_pmon_DBISEHA\ngrid     45768     1  0  2022 ?        00:05:07 apx_pmon_+APX1\ngrid     63447     1  0  2022 ?        00:04:47 asm_pmon_+ASM1\noracle   86674     1  0  2022 ?        00:05:22 ora_pmon_DBITST1\n<\/pre>\n<\/br>\n\n\n\n<p>The database has been automatically started on node 0 about 30 seconds later.<\/p>\n\n\n\n<p>Confirmed with the alert log file on node 0:<\/p>\n\n\n\n<pre class=\"brush: sql; gutter: true; first-line: 1; highlight: [1]\">\n[oracle@dbioda02 trace]$ more alert_DBISEHA.log\n...\n...\n...\n2023-01-27T10:55:55.393501+01:00\nStarting ORACLE instance (normal) (OS id: 18288)\n...\n...\n...\n<\/pre>\n<\/br>\n\n\n\n<h2 class=\"wp-block-heading\">Upgrade a RAC database to 19c SEHA database<\/h2>\n\n\n\n<p>A stated previously, databases in SE version lower than 19c and having RAC enabled will have to be converted to SEHA configuration as part of the upgrade to Oracle database 19c.<\/p>\n\n\n\n<p>Convert the oracle RAC database to a Single Instance database with following command (option -y SI):<\/p>\n\n\n\n<pre class=\"brush: sql; gutter: true; first-line: 1; highlight: [1]\">\n[root@dbioda02 ~]# odacli modify-database -in DBIRACSE -y SI\n<\/pre>\n<\/br>\n\n\n\n<p>Upgrade the SI database to Oracle 19c version with SEHA functionality enabled.<\/p>\n\n\n\n<pre class=\"brush: sql; gutter: true; first-line: 1; highlight: [1]\">\n[root@dbioda02 ~]# odacli upgrade-database -i 42612408-6ddf-4152-bce0-74ed41394866 \u2013to 5b0b3769-0c05-435e-b7c8-5d295c05934c -sh\n<\/pre>\n<\/br>\n\n\n\n<p>Enable\/disable options are available for all 3 odacli create, modify and upgrade database commands.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>SEHA means Standard Edition High Availability. SEHA is fully integrated with Oracle Grid Infrastructure starting with Oracle Grid Infrastructure 19c, and more specifically since RU 19.7. SEHA provides then cluster-based failover for single-instance Standard Edition Oracle Databases using Oracle Clustware. It is important to mention that Oracle removed Oracle RAC from SE2 Edition since 19c.<\/p>\n","protected":false},"author":48,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[59],"tags":[2567,96,2798],"type_dbi":[],"class_list":["post-21174","post","type-post","status-publish","format-standard","hentry","category-oracle","tag-oda-2","tag-oracle","tag-seha"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>SEHA on ODA? - 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\/seha-on-oda\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SEHA on ODA?\" \/>\n<meta property=\"og:description\" content=\"SEHA means Standard Edition High Availability. SEHA is fully integrated with Oracle Grid Infrastructure starting with Oracle Grid Infrastructure 19c, and more specifically since RU 19.7. SEHA provides then cluster-based failover for single-instance Standard Edition Oracle Databases using Oracle Clustware. 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