Changing the Default API-M Databases

When you use WSO2 API Manager (WSO2 API-M), you need the following databases in addition to the Carbon database. By default, WSO2 API-M is shipped with embedded H2 databases for the following in addition to the Carbon database. These databases are stored in the <API-M_HOME>/repository/database directory.

• WSO2AM_DB: For API-M-specific data.

• WSO2MB_DB: For message brokering data.

• WSO2METRICS_DB: For storing data for Metrics monitoring.

Given below are the steps you need to follow in order to change the default databases listed above.

Step 1 - Set up the database

You can set up the following database types for the API-M-specific databases:

• Setting up a MySQL database
• Setting up an MS SQL database
• Setting up an Oracle database
• Setting up an IBM DB2 database
• Setting up a PostgreSQL database

Step 2 - Create the datasource connection

A datasource is used to establish the connection to a database. By default, datasource connections for the API-M database, API-M statistics database, and the Message Brokering database are configured in the master-datasources.xml file. The datasource connection for the Metrics database is configured in the metrics-datasources.xml file. These datasource configurations point to the default  H2 databases, which are shipped with the product. After setting up new databases to replace the default H2 databases, you can either change the default configurations in the above-mentioned files or configure new datasources.

Create the datasource connection for the API-M database

Follow the steps below.

1. Open the <API-M_HOME>/repository/conf/datasources/master-datasources.xml file and locate the <datasource> configuration element.

2. Update the URL pointing to your database, the username and password required to access the database, and the driver details as shown below. 

    Optionally, you can update the other elements 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 waits (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. You can enter zero to create none.
   testOnBorrow	The indication of whether objects are validated before being borrowed from the pool. If the object fails to validate, it is dropped from the pool, and another attempt is made to borrow another.
   validationQuery	The SQL query that is used to validate connections from this pool before returning them to the caller.
   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 is not validated again.
   defaultAutoCommit	This property is only applicable to the MB Store database of WSO2 APIM, where this property should be explicitly set to false. In all other database connections explained above, auto committing is enabled or disabled at the code level as required for that database, i.e., the default auto commit configuration specified for the RDBMS driver will be effective instead of this property element. Note that auto committing is typically enabled for an RDBMS 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.

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

Create the datasource connection for the MB database (MB Store in WSO2 API-M)

Follow the steps below.

1. Open the <API-M_HOME>/repository/conf/datasources/master-datasources.xml file and locate the <datasource> configuration element.

2. Update the URL pointing to your database, the username and password required to access the database, and the driver details as shown below. Further, be sure to set the <defaultAutoCommit> element to false for the MB database. 
   

    Optionally, you can update the other elements 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 waits (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. You can enter zero to create none.
   testOnBorrow	The indication of whether objects are validated before being borrowed from the pool. If the object fails to validate, it is dropped from the pool, and another attempt is made to borrow another.
   validationQuery	The SQL query that is used to validate connections from this pool before returning them to the caller.
   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 is not validated again.
   defaultAutoCommit	This property is only applicable to the MB Store database of WSO2 APIM, where this property should be explicitly set to false. In all other database connections explained above, auto committing is enabled or disabled at the code level as required for that database, i.e., the default auto commit configuration specified for the RDBMS driver will be effective instead of this property element. Note that auto committing is typically enabled for an RDBMS 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.

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

Create the datasource connection for the Metrics database

Follow the steps below.

1. Open the <API-M_HOME>/repository/conf/datasources/metrics-datasources.xml file and locate the <datasource> configuration element.

2. Update the URL pointing to you database, the username and password required to access the database, and the driver details as shown below. 
   

    Optionally, you can update the other elements 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 waits (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. You can enter zero to create none.
   testOnBorrow	The indication of whether objects are validated before being borrowed from the pool. If the object fails to validate, it is dropped from the pool, and another attempt is made to borrow another.
   validationQuery	The SQL query that is used to validate connections from this pool before returning them to the caller.
   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 is not validated again.
   defaultAutoCommit	This property is only applicable to the MB Store database of WSO2 APIM, where this property should be explicitly set to false. In all other database connections explained above, auto committing is enabled or disabled at the code level as required for that database, i.e., the default auto commit configuration specified for the RDBMS driver will be effective instead of this property element. Note that auto committing is typically enabled for an RDBMS 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.

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

Create the datasource connection for the Analytics database

The API Manager integrates with the WSO2 Analytics platform to provide reports, statistics, and graphs on the APIs deployed in WSO2 API Manager. You can then configure alerts to monitor these APIs, and detect unusual activity, manage locations via geo location statistics, and carry out detailed analysis of the logs.

Follow the steps below to create the datasource connection for the Analytics database:

1. Open the <API-M_ANALYTICS_HOME>/repository/conf/datasources/analytics-datasources.xml file. Note that two datasources named as WSO2_ANALYTICS_EVENT_STORE_DB and WSO2_ANALYTICS_PROCESSED_DATA_STORE_DB are configured by default to point to the H2 databases.

2. Create two database schemas in your database server (MySQL, Oracle, etc) for the two datasources, and change the configurations of those datasources to point to the relevant schemas. A sample configuration is given below. 

   The database user you provide here requires permissions to create tables. 

   Note that you do not need to run the database scripts against the created databases as the tables for the datasources are created at runtime.

   <datasource>
       <name>WSO2_ANALYTICS_EVENT_STORE_DB</name>
       <description>The datasource used for analytics record store</description>
       <definition type="RDBMS">
           <configuration>
               <url>jdbc:mysql://localhost:3306/stats_200?autoReconnect=true&amp;relaxAutoCommit=true</url>
               <username>root</username>
               <password>root</password>
               <driverClassName>com.mysql.jdbc.Driver</driverClassName>
               <maxActive>50</maxActive>
               <maxWait>60000</maxWait>
               <testOnBorrow>true</testOnBorrow>
               <validationQuery>SELECT 1</validationQuery>
               <validationInterval>30000</validationInterval>
               <defaultAutoCommit>false</defaultAutoCommit>
           </configuration>
       </definition>
   </datasource>

   • If you are using Oracle, its recommended to increase the DB block size as described in http://www.oratable.com/ora-01450-maximum-key-length-exceeded/, to avoid the error 'ORA-01450: maximum key length (6398) exceeded'.

   • If you are using DB2, run this script before you start the WSO2 API-M Analytics server.

   • If you are using MySQL 5.7, open <API-M_ANALYTICS_HOME>/repository/conf/analytics/spark/spark-jdbc-config.xml and configure the stringType property under the typeMapping element as follows.
     <stringType>VARCHAR(100)</stringType> 
   If you are using MSSQL, add the SendStringParametersAsUnicode property to the database connection URL in the data source configuration in the <API-M_ANALYTICS_HOME>/repository/conf/datasources/analytics-datasources.xml file as shown below to avoid deadlock issues that are caused when the same table row is updated in two or more sessions at the same time.

   <url>SQLSERVER_JDBC_URL;SendStringParametersAsUnicode=false</url>

3. Share the WSO2AM_STATS_DB datasource between WSO2 API-M and WSO2 API-M Analytics as follows.

   1. Open the <API-M_HOME>/repository/conf/datasources/master-datasources.xml file and make sure that a configuration for the WSO2AM_STATS_DB datasource is included. The default configuration is as follows.

      <datasource>
         <name>WSO2AM_STATS_DB</name>
         <description>The datasource used for setting statistics to API Manager</description>
         <jndiConfig>
            <name>jdbc/WSO2AM_STATS_DB</name>
         </jndiConfig>
         <definition type="RDBMS">
            <configuration>
               <url>jdbc:mysql://localhost:3306/WSO2AM_STATS_DB?autoReconnect=true&amp;relaxAutoCommit=true</url>
               <username>root</username>
               <password>root</password>
               <driverClassName>com.mysql.jdbc.Driver</driverClassName>
               <maxActive>50</maxActive>
               <maxWait>60000</maxWait>
               <testOnBorrow>true</testOnBorrow>
               <validationQuery>SELECT 1</validationQuery>
               <validationInterval>30000</validationInterval>
               <defaultAutoCommit>false</defaultAutoCommit>
            </configuration>
         </definition>
      </datasource>

      you need to enable analytics in publisher, store and gateway nodes. However, you need to add this datasource configuration in gateway nodes. Following table provides more information on Analytics usage of API Manager components in a distributed environment.

      Component	Enable statistics	Events Published	Read statsDB
      Gateway_Manager	YES only if accept request	YES only if accept request	NO
      Gateway_worker	YES	YES	NO
      Key Manager	NO	NO	NO
      Publisher	YES	NO	YES
      Store	YES	YES	YES
      Traffic Manager	NO	NO	NO

      You do not need to enable analytics in Key Manager and Traffic Manager nodes as those components do not read or publish statistics. Though gateway nodes publish events, they are not reading statistics database. Therefore, you are not required to add the WSO2AM_STATS_DB datasource configuration in gateway nodes. Publisher node read statistics but not publishing events. Therefore, you can disable event publisher initialization at startup in publisher by setting <SkipEventReceiverConnection> value to true in <PUBLISHER_HOME>/repository/conf/api-manager.xml.API Store node reads statistics and also publish events. Therefore, we need to keep the statsource configuration for statsDB in Store node as well.

   2. Open the <API-M_ANALYTICS_HOME>/repository/conf/datasources/stats-datasources.xml file and make sure that the same configuration in the <API-M_HOME>/repository/conf/datasources/master-datasources.xml file (mentioned in the previous sub step) is added in it.

4. Create a schema in your database server similar to the WSO2AM_STATS_DB datasource. Make sure that this datasource points to the relevant schema. 

   The database user you provide here requires permissions to create tables.

5. Download and copy the relevant database driver JAR file to the <API-M_ANALYTICS_HOME>/repository/components/lib directory.
6. Start the WSO2 API-M Analytics server.

Step 3 - Create database tables

To create the database tables, connect to the databases that you created earlier and run the scripts provided in the product pack.

Create database tables in the API-M database 

The DB scripts corresponding to the database type are provided in the <API-M_HOME>/dbscripts/apimgt directory.

To create the necessary database tables:

1. Connect to the database and run the relevant script.
   For example, run the following command to create the API-M tables in a MySQL database.

   mysql -u root -p -DWSO2AM_DB < '<API-M_HOME>/dbscripts/apimgt/mysql.sql';

   <API-M_HOME>/dbscripts/apimgt/mysql.sql is the script that should be used for MySQL 5.6 and prior versions. If you database is MySQL 5.7 or later version, use <API-M_HOME>/dbscripts/apimgt/mysql5.7.sql script file.

2. Restart the WSO2 API-M server.

Create database tables in the MB database 

The DB scripts corresponding to the database type are provided in the <API-M_HOME>/dbscripts/mb-store directory.

To create the necessary database tables:

1. Connect to the database and run the relevant script. 
   For example, run the following command to create the MB tables in a MySQL database.

   mysql -u root -p -DWSO2MB_DB < '<API-M_HOME>/dbscripts/mb-store/mysql-mb.sql';

2. Restart the WSO2 API-M server.

Create database tables in the Metrics database 

The DB scripts corresponding to the database type are provided in the <API-M_HOME>/dbscripts/metrics directory.

To create the necessary database tables:

1. Connect to the database and run the relevant script. 
   For example, run the following command to create the MB tables in a MySQL database.

   mysql -u root -p -DWSO2_METRICS_DB < '<API-M_HOME>/dbscripts/metrics/mysql.sql';

   <API-M_HOME>/dbscripts/metrics/mysql.sql is the script that should be used for MySQL 5.6 and prior versions. If you database is MySQL 5.7 or later version, use <API-M_HOME>/dbscripts/metrics/mysql5.7.sql script file.

2. Restart the WSO2 API-M server.