Standard Edition High Availability (SEHA) - The Why, What & How
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Standard Edition High Availability (SEHA) is the latest addition to Oracle’s high availability solutions. This presentation explains the motivation for Standard Edition High Availability, how it is implemented and the way it works currently as well as what is planned for future improvements. It was first presented during Oracle Groundbreakers Yatra (OGYatra) Online in July 2020.
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Standard Edition High Availability (SEHA) - The Why, What & How
- 1. Standard Edition High Availability The Why, What & How Markus Michalewicz Senior Director of Product Management Oracle Database High Availability | Scalability | MAA July 15, 2020 @KnownAsMarkus www.linkedin.com/in/markusmichalewicz www.slideshare.net/MarkusMichalewicz
- 2. Safe harbor statement The following is intended to outline our general product direction. It is intended for information purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. The development, release, timing, and pricing of any features or functionality described for Oracle’s products may change and remains at the sole discretion of Oracle Corporation. 2 Copyright © 2020, Oracle and/or its affiliates
- 3. Standard Edition High Availability 1 Introduction 2 The What 3 The Why 4 The How 5 Summary 3 Copyright © 2020, Oracle and/or its affiliates
- 4. Standard Edition High Availability 1 Introduction 2 The What 3 The Why 4 The How 5 Summary 4 Copyright © 2020, Oracle and/or its affiliates
- 5. Oracle Database Editions Use Enterprise Edition for extended high availability (HA) needs Standard Edition 2 (SE2) • “Sound Single Instance for SMEs & workgroups” • Base set of database HA functionality • No option support • Disaster Recovery (DR) solutions via third party Enterprise Edition (EE) • “All Inclusive + Options” • Full set of database HA functionality • Additional HA options: • Active Data Guard • Real Application Clusters (RAC) • RAC One Node • Oracle Sharding • Full support for Oracle Maximum Availability Architecture (MAA) 5 Copyright © 2020, Oracle and/or its affiliates Upgrade https://docs.oracle.com/en/database/oracle/oracle-database/19/dblic/Licensing-Information.html Enterprise Edition
- 6. Database High Availability (HA) General Introduction Database inherent High Availability features • Available with database • Examples: • Online Operations • B&R Operations Cluster-based Failover • Local HA solution • Database failover from one server to another in case of • Server failure • Instance failure Disaster Recovery (DR) • Remote HA solution • Database recovery typically in remote location after failure of primary site Active / Active HA • Local / remote HA solution • Database is accessible from multiple servers concurrently • In case of a failure, another database instance takes over 6 Copyright © 2020, Oracle and/or its affiliates
- 7. Oracle High Availability Features General concepts mapped to Oracle solutions Database inherent High Availability features • Oracle Database • Standard Edition • Enterprise Edition • Oracle Restart Cluster-based Failover • Local HA solution • Standard Edition High Availability • RAC One Node Disaster Recovery • Remote HA solution • Data Guard • Active Data Guard Active / Active HA • Local / remote HA solution • Oracle RAC (pictured) • Oracle Sharding • Oracle GoldenGate 7 Copyright © 2020, Oracle and/or its affiliates
- 8. On-Prem Database HA Solutions Ranked by approximate protection level 8 Copyright © 2020, Oracle and/or its affiliates upgrade path protectionlevel + + + MAA Mission Critical • Oracle RAC (One Node) • Physical Replication • Complete Data Protection GOLD solution SE/EE Upgrade
- 9. Virtualization-based HA Solutions 9 Copyright © 2020, Oracle and/or its affiliates solution + Protection levels failing over a “black box” protectionlevel
- 10. Oracle Cloud-based Database HA Solutions 10 Copyright © 2020, Oracle and/or its affiliates solution Highest protection levels due to complete integration protectionlevel ORACLE AUTONOMOUS DATABASE Cloud-based DR via replicated service
- 11. Standard Edition High Availability 1 Introduction 2 The What 3 The Why 4 The How 5 Summary 11 Copyright © 2020, Oracle and/or its affiliates
- 12. What is Standard Edition High Availability? https://docs.oracle.com/en/database/oracle/oracle-database/19/ladbi/about-standard-edition-high-availability.html Standard Edition High Availability • Provides fully integrated cluster-based failover for single-instance Standard Edition Oracle Databases using Oracle Clusterware. • Benefits from Oracle Clusterware, Oracle Automatic Storage Management (Oracle ASM) and Oracle ASM Cluster File System (ACFS) • Consequently, the expected failover time is much faster than any cluster solution that relies on failing over and remounting volumes and file systems. • Supports Linux x86-64, Oracle Solaris on SPARC (64-bit), and Microsoft Windows. • Follows Oracle Clusterware certification. 12 Copyright © 2020, Oracle and/or its affiliates protectionlevel solution
- 13. Standard Edition High Availability What it is and what it isn’t Database inherent High Availability features • Oracle Database • Standard Edition • Enterprise Edition • Oracle Restart Cluster-based Failover • Local HA solution • Standard Edition High Availability • RAC One Node Disaster Recovery • Remote HA solution • Data Guard • Active Data Guard Active / Active HA • Local / remote HA solution • Oracle RAC (pictured) • Oracle Sharding • Oracle GoldenGate 13 Copyright © 2020, Oracle and/or its affiliates See also: https://docs.oracle.com/en/database/oracle/oracle-database/19/cwadd/introduction-to- oracle-clusterware.html#GUID-C54E2511-24E2-452B-B4C7-0D5A93A751A9
- 14. Standard Edition High Availability (SEHA) Most Frequently Asked Questions (FAQ) Is SEHA the same as RAC One Node? • NO. RAC One Node is an option to the Oracle Enterprise Edition (EE). • RAC One Node uses the same infrastructure • but provides more functionality such as Online Database Relocation. • SEHA has no RAC code enabled in the database. Does SEHA follow Oracle SE2 licensing? • YES. SEHA follows Oracle SE2 license. • SEHA has a 2 sockets per server license restriction. • One can have ”unlimited sockets” (100 nodes max) in the cluster assuming each server uses max. 2 sockets. How many CPUs does SEHA use per server? • 16 CPUs threads, as SE2 single instance. • CPU threads are counted on OS-level and can be threads or cores depending on the HW used. • Unlike RAC SE2, one SEHA instance uses max. 16 CPU threads for foreground processes. Can SEHA be licensed using the 10-day- failover rule? • YES. As any other database failover solution, SEHA can be licensed using the 10-day-failover rule. • All requirements for this rule need to be met; for details see: • https://www.orac le.com/assets/da ta-recovery- licensing- 070587.pdf 14 Copyright © 2020, Oracle and/or its affiliates
- 15. Standard Edition High Availability 1 Introduction 2 The What 3 The Why 4 The How 5 Summary 15 Copyright © 2020, Oracle and/or its affiliates
- 16. Why Standard Edition High Availability (SEHA)? 16 Copyright © 2020, Oracle and/or its affiliates protectionlevel solution SE2 Oracle RAC has seen diminishing demand with 2 socket servers becoming a standard and increased high availability requirements. SEHA provides the required HA and enables multiple upgrade paths; e.g. to Oracle DB EE.
- 17. Standard Edition High Availability Alternative 17 Copyright © 2020, Oracle and/or its affiliates protectionlevel solution ORACLE AUTONOMOUS DATABASE • A migration to (Autonomous Database in the) Oracle Cloud is an attractive upgrade path for customers – financially and functionally. • Autonomous Database provides EE features at a compelling conversion rate, especially for applications using Standard Edition features. For more information see: https://www.slideshare.net/MarkusMichalewicz/oracle- database-availability-scalability-across-versions-editions Accelerate move to the cloud with Autonomous Database
- 18. Oracle Grows with Business Demands Simplified industry growth / startup lifecycle 18 Copyright © 2020, Oracle and/or its affiliates Idea / Startup Growth Expansion / Mature time sales/growth Enterprise Edition
- 19. Oracle Grows with Business Demands Providing a choice of integrated platforms 19 Copyright © 2020, Oracle and/or its affiliates Idea / Startup Growth Expansion / Mature time sales/growth ORACLE AUTONOMOUS DATABASE Enterprise Edition https://www.slideshare.net/MarkusMichalewicz/why-use-an-oracle-database-2020-update
- 20. Oracle Database – Choice of Deployment Most Manual Most Autonomous DB installed on commodity HW on premises DB installed on Oracle Exadata on premises DB on Oracle Cloud Infrastructure Oracle Autonomous Database Database Cloud Service Exadata Cloud Service (or C@C) 20
- 21. Standard Edition High Availability 1 Introduction 2 The What 3 The Why 4 The How 5 Summary 21 Copyright © 2020, Oracle and/or its affiliates
- 22. How to Setup a Standard Edition High Availability (SEHA) Database Requirements (https://docs.oracle.com/en/database/oracle/oracle-database/19/ladbi/guidelines-for-seha.html) SEHA minimum requirements: • At least 2 nodes of a Standalone Oracle Grid Infrastructure 19.7 or later cluster. • Standard Edition Oracle Database home version 19.7 or later on at least 2 nodes. • Local and shared ACFS homes are supported • If local homes are used, the structure and operations need to be kept consistent across all homes used for the same DB. • Use an SPFILE for database instance initialization parameters and a database password file stored in Oracle ASM or ACFS. • You must register the database with SCAN listeners as “remote listener” and node listeners as “local listeners”. 22 Copyright © 2020, Oracle and/or its affiliates SPFILE, PWD file in ASM / ACFS Local home Local home SCAN
- 23. How to Setup a Standard Edition High Availability Database Configuration (https://docs.oracle.com/en/database/oracle/oracle-database/19/admin/creating-and- configuring-an-oracle-database.html#GUID-4B255433-4F5D-4A75-BB05-EBAB41361B5E) There is no direct upgrade path to Oracle Database 19c Standard Edition High Availability (SEHA) • For former Standard Edition RAC systems: • The infrastructure remains unchanged • Upgrade to Oracle Grid Infrastructure 19c (19.7+) • Follow My Oracle Support note 2504078.1: ”Desupport of Oracle Real Application Clusters (RAC) with Oracle Database Standard Edition 19c” - To convert a RAC database to single instance • Follow the instructions provided in the SEHA documentation to complete the onfiguration • For new Oracle Database 19c deployments: • Follow the instructions provided in the SEHA documentation (link in the subtitle) 23 Copyright © 2020, Oracle and/or its affiliates Node1 Node2
- 24. How to Setup a Standard Edition High Availability Database Configuration basics Basic configuration assumes registering a single instance database (DB) with Oracle Clusterware on 2 or more nodes of the cluster: $ srvctl add database -db se2cdb ß New DB -oraclehome $ORACLE_HOME -dbtype SINGLE –spfile +DATA/SE2CDB1/PARAMETERFILE/spfile.276.1030845691 -node node1,node2 $ srvctl modify database ß Existing DB -db se2cdb -node node1,node2 The node list is ordered and honored unless other circumstances in the cluster prevent honoring the order. 24 Copyright © 2020, Oracle and/or its affiliates Node1 Node2
- 25. How to Setup a Standard Edition High Availability Database Configuration tips and tricks Tips and tricks: • Ensure that the initialization parameter local_listener is not set. • When the database files are stored in Oracle ASM Cluster File System (ACFS), register the ACFS file system with Oracle Clusterware and create a dependency of the database resource on the corresponding ACFS resource. • The SEHA instance will use 16 CPU threads for a foreground process on any given node in the cluster even if the node has more than 16 CPUs. • A node must not have more than 2 sockets. 25 Copyright © 2020, Oracle and/or its affiliates Instance uses 16 CPU threads. Node1 Node2
- 26. How to Setup a Standard Edition High Availability Database Result for unplanned failures With a DB configured as follows: $ srvctl config database -db se2cdb ... Type: SINGLE ... Configured nodes: node1, node2 • Upon the first two failures, the SEHA instance is restarted on the same node • ER is filed to reduce failure count to 1 failure only • Upon third failure, the SEHA instance will restart on the next available node configured 26 Copyright © 2020, Oracle and/or its affiliates 123 Node1 Node2
- 27. How to Setup a Standard Edition High Availability Database Relocate databases at your convenience $ srvctl relocate database -db se2cdb -node node2 ß destination node • A relocate database is an implicit stop and subsequent start of the database instance. • This is the difference to Oracle RAC One Node’s Online Database Relocation feature, which will open 2 instances temporarily. • SEHA prevents 2 instances to run simultaneously, as it is NOT RAC-enabled. • If a service is used on the SEHA database (recommended), relocation can get delayed - See published BUG 31128434 for details - Use a manual stop followed by a start on the destination node to avoid shutdown suspension. 27 Copyright © 2020, Oracle and/or its affiliates Relocate Node1 Node2
- 28. How to Setup a Standard Edition High Availability Database Starting and Stopping a SEHA database $ srvctl start database -db sec2cdb -node node2 ß optional $ srvctl stop database -db sec2cdb 28 Copyright © 2020, Oracle and/or its affiliates Node1 Node2 srvctlstart database srvctlstop database srvctlstart database srvctlstop database
- 29. Standard Edition High Availability Expected failover and relocation times (actual values may differ based on various factors) 29 Copyright © 2020, Oracle and/or its affiliates Node panic: ~2 minutes failover DB relocation (planned): ~1 minute
- 30. Standard Edition High Availability Demo 30 Copyright © 2020, Oracle and/or its affiliates
- 31. Standard Edition High Availability 1 Introduction 2 The What 3 The Why 4 The How 5 Summary 31 Copyright © 2020, Oracle and/or its affiliates
- 32. Standard Edition High Availability Fully integrated and documented Standard Edition High Availability provides • fully integrated cluster-based failover for single-instance Standard Edition Oracle Databases. • Using Oracle Clusterware, Oracle Automatic Storage Management (ASM) and ASM Cluster File System (ACFS) • the required high availability for most applications using a Standard Edition Oracle Databases. Standard Edition High Availability is fully documented • https://docs.oracle.com/en/database/oracle/oracle-database/19/admin/creating-and-configuring-an- oracle-database.html#GUID-4B255433-4F5D-4A75-BB05-EBAB41361B5E • About Standard Edition High Availability • Requirements for Using Standard Edition High Availability With Oracle Databases • Enabling Standard Edition High Availability for Oracle Databases • Relocating a Standard Edition High Availability Database to Another Node • Adding a Node to a Standard Edition High Availability Database* • Removing a Configured Node from a Standard Edition High Availability Database* • Starting and Stopping Standard Edition High Availability Databases • Deactivating Standard Edition High Availability for Oracle Databases* 32 Copyright © 2020, Oracle and/or its affiliates * Steps not covered in this presentation
- 33. 33 Copyright © 2020, Oracle and/or its affiliates Thank you Markus Michalewicz ([email protected]) Senior Director of Database Product Management @KnownAsMarkus www.linkedin.com/in/markusmichalewicz www.slideshare.net/MarkusMichalewicz
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