Upgrading DB2 databases

For DB2, upgrade your existing schemas and data so that your databases work with the new version of IBM® Business Process Manager.

Figure 1. Sample environment after existing schemas and data are updated. The source environment is not running and the databases are not in use. The databases contain updated schemas and data. The target is not running but contains a deployment environment.

The details of the diagram are provided in the figure caption.

Run the DBUpgrade command to modify your existing database schemas and data for use with IBM Business Process Manager V8.5. The DBUpgrade utility updates the following items to V8.5:

System Data toolkit
Process Portal process application
Hiring Sample tutorial process application

Note: Although the DBUpgrade utility updates the System Data toolkit to IBM Business Process Manager V8.5, it does not automatically update existing dependencies. The dependencies must be updated after migration.

Before you begin

Ensure that you have shut down the source environment before you proceed with the migration.

Verify that the users that are configured to access your DB2 databases have the necessary privileges to upgrade the databases. The following database privileges are needed to modify existing DB2 database schemas and data for use with IBM Business Process Manager V8.5.

The CONNECT and CREATETAB privileges are required on the database level.
The upgrade process accesses system views and procedures. Grant the SELECT and EXECUTE privileges to the user who performs the upgrade. These privileges are already granted to the public group by default; it is not necessary to grant them again unless they were revoked.
```
syscat.tables
syscat.views
syscat.columns
syscat.indexes

PROCEDURE ADMIN_CMD and REORG authority
```

For a list of supported database versions, refer to the system requirements.

IBM Business Process Manager Advanced system requirements

Procedure

For each deployment environment that you are creating, complete the following steps:

If you are migrating from IBM Business Process Manager V7.5.x, complete the following steps:
Copy the upgrade SQL scripts that you generated by running the BPMGenerateUpgradeSchemaScripts utility from target_deployment_manager_profile/dbscripts/Upgrade to your database computer. See Generating SQL scripts for DB2 and configuring new database components for the list of scripts that you generated. Run the SQL scripts.

Note: The Process and Performance Data Warehouse database upgrade scripts do not need to be run manually, because they will be invoked by the DBUpgrade command.
Use one of these methods to run the scripts:
- Run the SQL scripts using the upgradeSchema.sh file that was generated along with the SQL scripts.
- Run the SQL scripts directly using an SQL session.
To run the SQL scripts directly, run the scripts in the following sequence:
- Run all upgradeTablespac* scripts before you run any upgradeSchema* scripts.
- Run the upgradSchema_SchemaStatus.sql script before you run any other "upgradeSchema*" SQL scripts.
Use the following parameters and commands:
```
db2 -s -t -v -z log name  -f  script_name
```
where:
- -s specifies that the script is to exit as soon as the first error occurs
- -t specifies that the statement is to be printed on the command line so that it can be logged in a log file
- -v specifies that the output from the command is to be sent to a log file that can be used for error checking
- -z specifies that the semicolon (;) is to be treated as a delimiter for the commands in the file
- -f specifies the input file name
Note: If you had the Business Process Choreographer Reporting function configured, it was removed during runtime migration. However, the associated data was not automatically removed from the database. If you determine that you no longer need this data, run the dropSchema_Observer.sql script and then the dropTablespace_Observer.sql script using an SQL session with special configuration.
You might see warning messages when you run the scripts to upgrade the Business Space database telling you that the result of a query is an empty table or that no row was found for FETCH, UPDATE or DELETE. These messages can safely be ignored.
To upgrade the databases to V8.5, run the DBUpgrade utility.
Important: Ensure that your deployment manager and all the managed nodes in the source environment have been stopped before running this utility.
```
BPM_home/bin/DBUpgrade.sh -propertiesFile migration_properties_file -backupFolder snapshot_folder
```
where:
- migration_properties_file is the full path to the migration properties file in which you specified the configuration information for the target environment. Ensure that the value of the target.config.property.file property is set to the full path of the configuration properties file that you used to create your target environment. You must also set the value of profile.name.
- snapshot_folder is the directory that contains the information that was extracted from the source environment
For example:
```
BPM_home/bin/DBUpgrade.sh -propertiesFile /opt/BPM85/util/migration/resources/migration.properties -backupFolder /tmp/snapshot
```
If you are migrating from 7.5.x and you get an out-of-memory error indicating too many or too large data records, you can try to increase the heap size of the JVM for the DBUpgrade command, or decrease the value of database.batch.size (the size of the records to be updated as a batch) in the following file: BPM_home/util/dbUpgrade/upgrade.properties. This example shows how to change the heap size of the JVM for the DBUpgrade command:
```
JVM_HEAPSIZE_OPTIONS="-Xms512m -Xmx768m"
$JAVA_EXE $JVM_HEAPSIZE_OPTIONS -cp $CLASSPATH
```

What to do next

You might see warning messages similar to the following in the upgrade log: Couldn't load Resource META-INF*****. These messages can safely be ignored.