User's Guide
   PART 4. Database Administration and Advanced Use
     CHAPTER 28. Accessing Remote Data       

Accessing multiple local databases

An Adaptive Server Anywhere server may have several local databases running at one time. By defining tables in other local Adaptive Server Anywhere databases as remote tables, you can perform cross database joins.

For example, if you are using database db1 and you want to access data in tables in database db2, you need to set up proxy table definitions that point to the tables in database db2. For instance, on an Adaptive Server Anywhere named testasa, you might have three databases available, db1, db2, and db3.

• If using ODBC, create an ODBC data source name entry for each database you will be accessing.

• Connect to one of the databases that you will be performing joins from. For example, connect to db1.

• Perform a CREATE SERVER for each other local database you will be accessing. This sets up a loopback connection to your Adaptive Server Anywhere server

  CREATE SERVER local_db2 
  CLASS 'asaodbc' 
  USING 'testasa_db2'
  CREATE SERVER local_db3 
  CLASS 'asaodbc'
  USING    'testasa_db3'

  or using JDBC:

  CREATE SERVER local_db2 
  CLASS 'asajdbc' 
  USING 'mypc1:2638/db2'
  CREATE SERVER local_db3 
  CLASS 'asajdbc'
  USING 'mypc1:2638/db3'

• Create proxy table definitions using CREATE EXISTING to the tables in the other databases you want to access.

  CREATE EXISTING TABLE employee 
  AT 'local_db2...employee'