Changing to Oracle RAC

By default, MWARE ESB uses the embedded H2 database as the database for storing user management and registry data. Given below are the instructions you need to follow in order to use Oracle RAC for this purpose.

Setting up Oracle RAC

The following sections describe how to set up Oracle RAC to replace the default H2 database in your MWARE product:

Oracle Real Application Clusters (RAC) is an option that facilitates clustering and high availability in Oracle database environments. In the Oracle RAC environment, some of the commands used in oracle.sql are considered inefficient. Therefore, the product has a separate SQL script, oracle_rac.sql for Oracle RAC. The Oracle RAC-friendly script is located in the <API-M_HOME>/dbscripts folder together with other .sql scripts.

Setting up the database and users

Follow the instructions below to set up an Oracle RAC database:

  1. As SYSDBA, create a database user and grant privileges to the user as shown below:

    CREATE USER '<USER_NAME>' IDENTIFIED BY '<PASSWORD>' ACCOUNT UNLOCK;
GRANT CONNECT TO '<USER_NAME>';
GRANT CREATE SESSION, CREATE TABLE, CREATE SEQUENCE, CREATE TRIGGER, CREATE PROCEDURE TO '<USER_NAME>';
ALTER USER '<USER_NAME'> QUOTA '<SPACE_QUOTA_SIZE_IN_MEGABYTES>' ON '<TABLE_SPACE_NAME>';
GRANT DBA TO '<USER_NAME>';
COMMIT;

  2. Exit from the session by executing the quit; command.

Setting up the drivers

Copy the Oracle JDBC libraries (for example, the <ORACLE_HOME>/jdbc/lib/ojdbc14.jar file) to the <API-M_HOME>/repository/components/lib/ directory.

  1. Unzip the MWARE ESB pack. Let's refer to it as <API-M_HOME>.

  2. Download the Oracle JDBC driver.

  3. Copy it to the <API-M_HOME>/repository/components/lib/ directory.

Executing db scripts to create tables on Oracle RAC database

  1. To create tables in the registry and user manager database (WSO2_SHARED_DB), login to the database via client and execute the relevant sql file.

    For example, let's consider shared_db as the database.

    SQL> @<API-M_HOME>/dbscripts/oracle_rac.sql

  2. To create tables in the apim database (WSO2AM_DB), login to the database via client and execute the relevant sql file.

    For example, let's consider apim_db as the database.

    SQL> @<API-M_HOME>/dbscripts/apimgt/oracle_rac.sql

Note

As the WSO2_MB_STORE DB is not shared and does not contain data that needs to be migrated, it is recommended to use the default H2 for WSO2_MB_STORE_DB even in production.

Troubleshooting

If you encounter the following error while using the default H2 database as the MB store database, follow the instructions in this section. Note that this error will only occur if the MB store database is corrupted.

ERROR ApplicationRegistry org.wso2.andes.kernel.AndesException: Connecting to database failed with jndi lookup : WSO2MBStoreDB. data source username : wso2carbon. SQL Error message : General error: java.lang.ArrayIndexOutOfBoundsException

  1. Replace the MB store database with the default H2 MB store database from a fresh MWARE ESB distribution.

  2. Restart the server.

Changing the database to Oracle RAC

Creating the datasource connection to Oracle RAC

A datasource is used to establish the connection to a database. By default, WSO2_SHARED_DB and WSO2AM_DB datasource are configured in the deployment.toml file for the purpose of connecting to the default H2 databases.

After setting up the Oracle RAC database to replace the default H2 database, either change the default configurations of the WSO2_SHARED_DB and WSO2AM_DB datasource, or configure a new datasource to point it to the new database as explained below.

Follow the instructions below to change the type of the default datasource.

  1. Open the <API-M_HOME>/repository/conf/deployment.toml configuration file and locate the [database.shared_db] and [database.apim_db] configuration elements.

  2. You simply have to update the URL pointing to your Oracle RAC database, the username, and password required to access the database and the Oracle RAC driver details as shown below.

    Element Description
    type The database type used
    url The URL of the database. The default port for Oracle RAC is 1521
    username and password The name and password of the database user
    driverClassName The class name of the database driver
    validationQuery The SQL query that will be used to validate connections from this pool before returning them to the caller.

    Sample configuration is shown below:

    type = "oracle"
url = "jdbc:oracle:thin:@(DESCRIPTION=(LOAD_BALANCE=on)(ADDRESS=(PROTOCOL=TCP)(HOST=racnode1) (PORT=1521))(ADDRESS=(PROTOCOL=TCP)(HOST=racnode2) (PORT=1521))(CONNECT_DATA=(SERVICE_NAME=rac)))"
username = "<USER_NAME>"
password = "<PASSWORD>"
driver = "oracle.jdbc.driver.OracleDriver"
validationQuery = "SELECT 1 FROM DUAL"
    [database.shared_db]
type = "oracle"
url = "jdbc:oracle:thin:@(DESCRIPTION=(LOAD_BALANCE=on)(ADDRESS=(PROTOCOL=TCP)(HOST=racnode1) (PORT=1521))(ADDRESS=(PROTOCOL=TCP)(HOST=racnode2) (PORT=1521))(CONNECT_DATA=(SERVICE_NAME=rac)))"
username = "sharedadmin"
password = "sharedadmin"
driver = "oracle.jdbc.driver.OracleDriver"
validationQuery = "SELECT 1 FROM DUAL"

[database.apim_db]
type = "oracle"
url = "jdbc:oracle:thin:@(DESCRIPTION=(LOAD_BALANCE=on)(ADDRESS=(PROTOCOL=TCP)(HOST=racnode1) (PORT=1521))(ADDRESS=(PROTOCOL=TCP)(HOST=racnode2) (PORT=1521))(CONNECT_DATA=(SERVICE_NAME=rac)))"
username = "apimadmin"
password = "apimadmin"
driver = "oracle.jdbc.driver.OracleDriver"
validationQuery = "SELECT 1 FROM DUAL"

  3. You can update the configuration elements given below for your database connection.

    Element Description
    maxActive The maximum number of active connections that can be allocated at the same time from this pool. Enter any negative value to denote an unlimited number of active connections.
    maxWait The maximum number of milliseconds that the pool will wait (when there are no available connections) for a connection to be returned before throwing an exception. You can enter zero or a negative value to wait indefinitely.
    minIdle The minimum number of active connections that can remain idle in the pool without extra ones being created, or enter zero to create none.
    testOnBorrow The indication of whether objects will be validated before being borrowed from the pool. If the object fails to validate, it will be dropped from the pool, and another attempt will be made to borrow another.
    validationInterval The indication to avoid excess validation, and only run validation at the most, at this frequency (time in milliseconds). If a connection is due for validation but has been validated previously within this interval, it will not be validated again.
    defaultAutoCommit This property is not applicable to the Carbon database in MWARE products because auto committing is usually handled at the code level, i.e., the default auto commit configuration specified for the RDBMS driver will be effective instead of this property element. Typically, auto committing is enabled for RDBMS drivers by default. When auto committing is enabled, each SQL statement will be committed to the database as an individual transaction, as opposed to committing multiple statements as a single transaction.
    commitOnReturn If defaultAutoCommit =false, then you can set commitOnReturn =true, so that the pool can complete the transaction by calling the commit on the connection as it is returned to the pool. However, If rollbackOnReturn =true then this attribute is ignored. The default value is false.
    rollbackOnReturn If defaultAutoCommit =false, then you can set rollbackOnReturn =true so that the pool can terminate the transaction by calling rollback on the connection as it is returned to the pool. The default value is false.

    Sample configuration is shown below:

    type = "oracle"
url = "jdbc:oracle:thin:@(DESCRIPTION=(LOAD_BALANCE=on)(ADDRESS=(PROTOCOL=TCP)(HOST=racnode1) (PORT=1521))(ADDRESS=(PROTOCOL=TCP)(HOST=racnode2) (PORT=1521))(CONNECT_DATA=(SERVICE_NAME=rac)))"
username = "<USER_NAME>"
password = "<PASSWORD>"
driver = "oracle.jdbc.driver.OracleDriver"
validationQuery = "SELECT 1 FROM DUAL"
pool_options.<OPTION-1> = <VALUE-1>
pool_options.<OPTION-2> = <VALUE-2>
...
    [database.shared_db]
type = "oracle"
url = "jdbc:oracle:thin:@(DESCRIPTION=(LOAD_BALANCE=on)(ADDRESS=(PROTOCOL=TCP)(HOST=racnode1) (PORT=1521))(ADDRESS=(PROTOCOL=TCP)(HOST=racnode2) (PORT=1521))(CONNECT_DATA=(SERVICE_NAME=rac)))"
username = "sharedadmin"
password = "sharedadmin"
driver = "oracle.jdbc.driver.OracleDriver"
validationQuery = "SELECT 1 FROM DUAL"
pool_options.maxActive = 100
pool_options.maxWait = 10000
pool_options.validationInterval = 10000

[database.apim_db]
type = "oracle"
url = "jdbc:oracle:thin:@(DESCRIPTION=(LOAD_BALANCE=on)(ADDRESS=(PROTOCOL=TCP)(HOST=racnode1) (PORT=1521))(ADDRESS=(PROTOCOL=TCP)(HOST=racnode2) (PORT=1521))(CONNECT_DATA=(SERVICE_NAME=rac)))"
username = "apimadmin"
password = "apimadmin"
driver = "oracle.jdbc.driver.OracleDriver"
validationQuery = "SELECT 1 FROM DUAL"
pool_options.maxActive = 50
pool_options.maxWait = 30000

    Info

    For more information on other parameters that can be defined in the <API-M_HOME>/repository/conf/deployment.toml file, see Tomcat JDBC Connection Pool.

  4. Restart the server.

    Note

    To give the Key Manager, Publisher, and Developer Portal components access to the user management data with shared permissions, JDBCUserStoreManager has been configured by default. For more information, refer Configuring Userstores.

    Info

    Changing WSO2CARBON_DB to Oracle RAC

    By default WSO2CARBON_DB will be an embedded H2 database and it is not necessary to change it to another database. But if you have a requirement to change it, you can follow the below steps. (When changing the carbon database, make sure that each server node have its own WSO2CARBON_DB. If you don't want to change the carbon database, then you can ignore this section.)

    • Create tables in the carbon database (WSO2CARBON_DB) using the script <API-M_HOME>/dbscripts/oracle_rac.sql.
    • Open the <API-M_HOME>/repository/conf/deployment.toml configuration file. Locate the [database.local] configuration element and update the URL pointing to your Oracle RAC database, the username, and password required to access the database and the Oracle RAC driver details similarly as explained before.
    [database.local]
type = "oracle"
url = "jdbc:oracle:thin:@(DESCRIPTION=(LOAD_BALANCE=on)(ADDRESS=(PROTOCOL=TCP)(HOST=racnode1) (PORT=1521))(ADDRESS=(PROTOCOL=TCP)(HOST=racnode2) (PORT=1521))(CONNECT_DATA=(SERVICE_NAME=rac)))"
username = "carbonadmin"
password = "carbonadmin"
driver = "oracle.jdbc.driver.OracleDriver"
validationQuery = "SELECT 1 FROM DUAL"
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