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1. Download the API Manager 1.9.0 from http://wso2.com/products/api-manager.  
2. Stop all running API Manager server instances.

3. Back up the databases of your API Manager 1.8.0 server instance.

4. Download the WSO2 API Migration Client v1.9.0 

5. Copy the downloaded client (org.wso2.carbon.apimgt.migrate.client-1.9.0.jar) into <APIM_1.9.0_HOME>/repository/components/dropins/

6. Change the query inside <APIM_1.9.0_HOME>/dbscripts/migration-1.8.0_to_1.9.0/drop-fk.sql according to your database type

   Note

   The default file contains sql scripts for mysql and if you use mysql no need to do the 6th step. Example quaries for H2  SELECT DISTINCT constraint_name FROM information_schema.constraints WHERE table_name = 'AM_APP_KEY_DOMAIN_MAPPING'; ALTER TABLE AM_APP_KEY_DOMAIN_MAPPING DROP CONSTRAINT <temp_key_name>; Example quaries for Oracle    SELECT DISTINCT constraint_name FROM user_cons_columns WHERE table_name = 'AM_APP_KEY_DOMAIN_MAPPING';     ALTER TABLE AM_APP_KEY_DOMAIN_MAPPING DROP CONSTRAINT <temp_key_name>;

7. Start the API Manager 1.9.0 with the command -Dmigrate=1.9 for database, registry and file system migrations. If you need to perform single resource migrations you can use the following commands. If you run -Dmigrate=1.9 earlier , you do not need to run the following commands

   1. For database migrations  run -Dmigrate=1.9 -DmigrateDB=true
   2. For registry migrations  run -Dmigrate=1.9 -DmigrateReg=true
   3. For file system migrations  run -Dmigrate=1.9 -DmigrateFS=true

   Note
   Please note that if you run -Dmigrate=1.9 without any additional parameters, it migrates all the resources.

8. To re-index the artifacts in the registry, perform the two steps given below.

   a) Rename the lastAccessTimeLocation in the <APIM_1.9.0_HOME>/repository/conf/registry.xml file. For example, change the /_system/local/repository/components/org.wso2.carbon.registry/indexing/lastaccesstime registry path to /_system/local/repository/components/org.wso2.carbon.registry/indexing/lastaccesstime_1.

   b) Shut down AM 1.9.0, backup and delete the <APIM_1.9.0_HOME>/repository/conf/solr directory and restart the server.

   Upgrading tenants

9. If you have multiple tenants added to your API Manager instance, follow the steps below to migrate tenant configurations:
   1. Copy the contents from your previous <APIM_HOME>/repository/tenants directory to the same directory in the API Manager 1.9.0. Do not replace the _TokenAPI_.xml, _RevokeAPI_.xml and _AuthorizeAPI_.xml files in the /default/api sub directory.
      
   2. Start the server
   3. Execute steps 3 and 4 for all tenants in your system.
   4. Execute steps 7 to 9 for all tenants in your system.

   Upgrading external stores

10. If you have external stores configured in the registry, follow the steps below:

    1. Log in to APIM 1.9.0 management console and click the Resources -> Browse menu.

    2. Load the /_system/governance/apimgt/externalstores/external-api-stores.xml resource in the registry browser UI, configure your external stores and save.

    Upgrading Google analytics

11. If you have Google Analytics configured in the registry, follow the steps below:

    1. Log in to APIM 1.9.0 management console and go to Resources -> Browse menu.

    2. Load the /_system/governance/apimgt/statistics/ga-config.xml resource in the registry browser UI, configure the Google analytics and save.

    Upgrading workflows

12. If you have Workflows configured in the registry, follow the steps below:

    1. Log in to APIM 1.9.0 management console and go to Resources -> Browse menu.

    2. Load the /_system/governance/apimgt/applicationdata/workflow-extensions.xml resource in the registry browser UI, configure your workflows and save.