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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-3723) Reset current schema to default (user name) when creating a new logical connection in the client driver
Date Mon, 16 Jun 2008 10:15:45 GMT
Reset current schema to default (user name) when creating a new logical connection in the client
driver
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                 Key: DERBY-3723
                 URL: https://issues.apache.org/jira/browse/DERBY-3723
             Project: Derby
          Issue Type: Improvement
          Components: JDBC, Network Client
    Affects Versions: 10.4.1.3, 10.3.3.0, 10.2.2.0, 10.1.3.1
         Environment: Primarily when connection pooling and statement caching are used.
            Reporter: Kristian Waagan
            Assignee: Kristian Waagan
            Priority: Minor
             Fix For: 10.4.1.4, 10.5.0.0


The current schema is used as part of the lookup key for the client side JDBC statement cache.
With the current implementation, the schema is explicitly fetched from the server by executing
a "VALUES CURRENT SCHEMA" query after a new logical connection has been created. This hurts
performance when using the JDBC statement cache, and in some cases it performs worse than
running without a client side JDBC statement cache.

The performance can be improved by resetting the current schema to the default on the client
when a new logical connection is created. The user name is used as the default schema in Derby.

Note that this issue is regarding logical connections. There is no API for changing the user
name, or default schema, for a logical connection. This ensures the schema must be set to
the associated user name for a newly created logical connection.

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