Multitenancy and Continuous Availability for Java Applications Oracle Database 18

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2 Multitenancy and Continuous Availability for Java Applications Oracle Database 18 Nirmala Sundarappa Kuassi Mensah Jean De Lavarene Principal Product Manager Director of Product Management Director, Development Oracle JDBC and UCP Java, Javascript, Datasources for Big Data Oracle JDBC and UCP Copyright 2017,Oracle and/or its affiliates. All rights reserved.

3 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, and timing of any features or functionality described for Oracle s products remains at the sole discretion of Oracle. Copyright 2017,Oracle and/or its affiliates. All rights reserved. 3

4 Program Agenda What s new? Multitenancy for Java applications Continuous availability - Planned Maintenance Continuous availability - Unplanned downtime Questions Copyright 2017,Oracle and/or its affiliates. All rights reserved. 4

5 Program Agenda What s new? Multitenancy for Java applications Continuous availability - Planned Maintenance Continuous availability - Unplanned downtime Questions Copyright 2017,Oracle and/or its affiliates. All rights reserved. 5

6 Oracle Database 18c DB 18 related capabilities will be updated once the Database 18c is released. Please stay tuned. Copyright 2017,Oracle and/or its affiliates. All rights reserved. Confidential Oracle Internal/Restricted/Highly Restricted 6

7 Program Agenda What s new? Multitenancy for Java applications Continuous availability - Planned Maintenance Continuous availability - Unplanned downtime Questions Copyright 2017,Oracle and/or its affiliates. All rights reserved. 7

8 Multitenancy for Java Applications Single instance for managing multiple databases Multitenant Container Database (CDB) Pluggable Database (PDB) or Tenant Multitenant Container Database (CDB) One set of background processes, one System global Area (SGA), many PDBs Manage Many as One Easier resource management Simple Operations on PDBs as entities. Unplug/plug, clone, create, drop Copyright 2017,Oracle and/or its affiliates. All rights reserved. Confidential Oracle Internal/Restricted/Highly Restricted 8

9 UCP Shared Pool for Cloud and Multitenant database UCP Shared Pool Overview for Multitenant database (What?) Implementation details of UCP Shared Pool (How?) UCP Shared Pool use cases (When?) References Sample code on Github Copyright 2017,Oracle and/or its affiliates. All rights reserved. 9

10 Problem to solve Each datasource creating its own connection pool - System resource wastage, limited scalability CP 25 CP 25 CP 25 CP 25 CP 25 CP 25 PDB1 PDB 2 PDB3 PDB 4 PDB 5 PDB 6 Multitenant Container Database Copyright 2017,Oracle and/or its affiliates. All rights reserved. 10

11 Solution Single Shared Connection Pool for multiple datasources Density, scalability & better usage of resources Shared Pool (50) PDB1 PDB 2 PDB3 PDB 4 PDB 5 PDB 6 Multitenant Container Database Copyright 2017,Oracle and/or its affiliates. All rights reserved. 11

12 Implementation details of UCP Shared Pool UCP XML file for configuration of the pool Required only when one datasource per tenant is used Use APIs when single datasource for all tenants usecase Use new APIs for configuration of the pool Internal invocation of Service Switch Alter session set container=<pdb_name> service=<service_name> Internal handling of RAC topology, Failover & Runtime Load Balancing Copyright 2017,Oracle and/or its affiliates. All rights reserved. Oracle Corporation - Confidential Restricted 12

13 Service Switch Capability Common user: Reuse of connections happens only if the common user (eg:c##1) is used and configured. Common user should have privileges to create/alter session and set container. Service Switch: UCP transparently uses new Service Switch to repurpose connections among tenants. - ALTER SESSION SET CONTAINER = xxx SERVICE = yyy RAC Topology, Failover & RLB RAC Topology: UCP stores RAC metadata & topology information indexed by the service. Failover Runtime Load balancing - Enforce RLB during connection creation and service switch FCF is turned ON by default fastconnectionfailoverenabled= true Copyright 2017,Oracle and/or its affiliates. All rights reserved. Oracle Corporation - Confidential Restricted 13

14 UCP Shared Pool Use Cases Single Datasource shared by all tenants One Datasource per tenant Copyright 2017,Oracle and/or its affiliates. All rights reserved. Oracle Corporation - Confidential Restricted 14

15 UCP Shared Pool: Single Datasource for All Tenants UCP pool Application Server (Mapping Tenant to Services) Multi-tenant Application Single Multitenant Datasource PDB 1 PDB 2 CDB PDB 3 Copyright 2017,Oracle and/or its affiliates. All rights reserved. Oracle Corporation - Confidential Restricted 15

16 UCP Shared Pool : APIs // Points to the CDB root service multitenantds.seturl("jdbc:oracle:thin "); // Create Connection to Tenant-1 Connection pdb1_conn = multitenantds.createconnectionbuilder().servicename("pdb1").build(); // password enabled role for tenant-2(if configured on the database) Properties pdb2roles = new Properties(); pdb2roles.put("pdb2-role", "pdb2-password"); // Create Connection to Tenant-2 and apply the tenant specific PDB roles. Connection pdb2_conn = multitenantds.createconnectionbuilder().servicename("pdb2").pdbroles(pdb2roles).build(); Copyright 2017,Oracle and/or its affiliates. All rights reserved. 16

17 UCP Shared Pool: One Datasource Per Tenant UCP pool Multi-tenant Application Tenant 1 Datasource PDB 1 Application Server (Mapping Tenant to Services) Tenant 2 Datasource Tenant 3 Datasource PDB 2 PDB 3 CDB Copyright 2017,Oracle and/or its affiliates. All rights reserved. Oracle Corporation - Confidential Restricted 17

18 Sample UCP XML Configuration file <ucp-properties> <connection-pool connection-pool-name="pool1" connection-factory-class-name="oracle.jdbc.pool.oracledatasource" (PORT=1521))(CONNECT_DATA=(SERVICE_NAME=myorcldbservice)))" user= "C##1" password= "password" initial-pool-size="10" min-pool-size="2" max-pool-size="30" max-connections-per-service="15" shared="true" > <data-source data-source-name="pds1" service="pdb1" description="pdb1 data source" /> <data-source data-source-name="pds2" service="pdb2" description="pdb2 data source" /> </connection-pool> </ucp-properties> Copyright 2017,Oracle and/or its affiliates. All rights reserved. Oracle Corporation - Confidential Restricted 18

19 Summary : One Datasource per tenant UCP XML config file is used only configuring the shared pool (MUST HAVE) Specify location of the file through a system property oracle.ucp.jdbc.xmlconfigfile Sample schema configuration.xsd is included in ucp.jar Key Attributes in UCP XML file connection-pool-name="pool1" : Identifies the shared pool shared=true: Flags it as a shared pool data-source: Each data-source uses its own service name Login credentials should be same for all datasources. Common user(eg:c##1) should be used for repurposing connections max-connections-per-service: Ensures fair distribution of connections based on tenant s workload Copyright 2017,Oracle and/or its affiliates. All rights reserved. Oracle Corporation - Confidential Restricted 19

20 New APIs to configure Shared pool Use APIs for reconfiguring the pool or datasource reconfiguredatasource(properties prop) for updating the datasource properties reconfigureconnectionpool(string poolname, Properties prop) for changing shared pool properties PoolDataSourceFactory.getPoolDataSource(Properties newdsprops) for adding a new datasource Copyright 2017,Oracle and/or its affiliates. All rights reserved. Confidential Oracle Internal/Restricted/Highly Restricted 20

21 UCP Shared Pool : New APIs // UCP XML configuration file path in case of Unix String file_uri = "file:/user/app/sharedpool/initial-shared-pool-config.xml"; // Java system property to specify XML configuration file location System.setProperty("oracle.ucp.jdbc.xmlConfigFile",<file_URI>); // Get the datasource instance, named as "pds1" in initial-shared-pool-config.xml PoolDataSource pds1 = PoolDataSourceFactory.getPoolDataSource("pds1"); Connection pds1conn = pds1.getconnection(); // Get the datasource instance, named as "pds2" in initial-shared-pool-config.xml PoolDataSource pds2 = PoolDataSourceFactory.getPoolDataSource("pds2"); Connection pds2conn = pds2.getconnection(); // Reconfigure datasource(pds1) using the new properties Properties newprops = new Properties(); newprops.put("servicename", <newservicename>); pds1.reconfiguredatasource(newprops); Copyright 2017,Oracle and/or its affiliates. All rights reserved. 21

22 UCP Shared Pool: New APIs // Adding a new datasource doesn t change the initial configuration file Properties newdsprops = new Properties(); newdsprops.put("servicename", "pdb3"); newdsprops.put("connectionpoolname", "pool1"); newdsprops.put("datasourcename", "pds3"); PoolDataSource pds3 = PoolDataSourceFactory.getPoolDataSource(newdsProps); // Reconfigure connection pool("pool1") using the new properties Properties newpoolprops = new Properties(); newpoolprops.put("initialpoolsize", <newinitialpoolsizevalue>); newpoolprops.put("maxpoolsize", <newmaxpoolsizevalue>); UniversalConnectionPoolManager ucpmgr = UniversalConnectionPoolManagerImpl.getUniversalConnectionPoolManager(); ucpmgr.reconfigureconnectionpool("pool1", newpoolprops); Copyright 2017,Oracle and/or its affiliates. All rights reserved. Confidential Oracle Internal/Restricted/Highly Restricted 22

23 Program Agenda What s new? Multitenancy for Java applications Continuous availability Planned maintenance Continuous availability - Unplanned downtime Questions Copyright 2017,Oracle and/or its affiliates. All rights reserved. 23

24 Hiding planned maintenance Transparent Planned Maintenance through draining at the database (Auto-drain) JDBC Driver support for FAN APIs SimpleFAN enhancements Copyright 2017,Oracle and/or its affiliates. All rights reserved. Confidential Oracle Internal/Restricted/Highly Restricted 24

25 Draining at the database during planned maintenance Auto-draining Instance A Planned Maintena nce RELOCATE or STOP SERVICE Instance B DOWN EVENT Database Drains the sessions at Safe Places Copyright 2017,Oracle and/or its affiliates. All rights reserved. Confidential Oracle Internal/Restricted/Highly Restricted 25

26 JDBC Driver support for FAN APIs JDBC driver supports Planned Maintenance Oracle JDBC driver supports FAN to broaden our HA coverage Driver closes the database sessions at a Safe Place Application must use one of the safe draining methods Validation SQL with a hint /*+ CLIENT_CONNECTION_VALIDATION */ SELECT 1 FROM DUAL Use of isvalid(), pingdatabase(), isusable(), endrequest() methods Requires simplefan.jar and ons.jar in the classpath Copyright 2017,Oracle and/or its affiliates. All rights reserved. Oracle Corporation - Confidential Restricted 26

27 SimpleFAN Enhancements Supported FAN events. NodeDownEvent, ServiceUpEvent, ServiceDownEvent LoadAdvisoryEvent Sample FAN payload for an Instance DOWN event VERSION=1.0 event_type=instance service=orclracdb instance=racinst1 database=testy db_domain=us.oracle.com host=myrachost status=down reason=failure timestamp= :32:43 timezone=-08:00 Copyright 2017,Oracle and/or its affiliates. All rights reserved. Confidential Oracle Internal/Restricted/Highly Restricted 27

28 Program Agenda What s new? Multitenancy for Java applications Continuous availability Planned maintenance Continuous availability Unplanned downtime Questions Copyright 2017,Oracle and/or its affiliates. All rights reserved. 28

29 Hiding unplanned maintenance DB 18 Improvements in AC Transparent Application Continuity (Auto-AC) Copyright 2017,Oracle and/or its affiliates. All rights reserved. Confidential Oracle Internal/Restricted/Highly Restricted 29

30 Application Continuity - Under the Hood Normal Operation Failover Phase 1: Reconnect Failover Phase 2: Replay Enable AC & use Replay driver AC records the DB requests Unplanned outage Check for AC & ready everything Replay the transactions Ensure the COMMITT status Copyright 2017,Oracle and/or its affiliates. All rights reserved. 30

31 Application Continuity as of today Use a Replay driver Request Boundaries (i.e., database unit of work) Side effects (calls for auditing, mailing, printing checks shouldn t be replayed) Session States Concrete classes oracle.jdbc.replay.oracledatasourceimpl UCPtransparently adds the request boundaries. 3 rd party applications need to use beginrequest() and endrequest() Need to disable using displayreplay() method Implement and register a UCP callback for setting custom connection states before replaying the unit of work Replace concrete classes with Java interfaces Copyright 2017,Oracle and/or its affiliates. All rights reserved. Confidential Oracle Internal/Restricted/Highly Restricted 31

32 Program Agenda What s new? Multitenancy for Java applications Continuous availability Planned maintenance Continuous availability Unplanned downtime Questions Copyright 2017,Oracle and/or its affiliates. All rights reserved. 32

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