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This article describes the method that the OS/2* Extended Edition Database Manager uses to locate a vital control block from any process at any given point after database connection has begun.
English (United States)
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Locate the Os/2 Extended Edition Database Manager's Database
This article describes the method that the OS/2* Extended Edition Database
Manager uses to locate a vital control block from any process at any given point
after database connection has begun.
The control block, referred to as the Database Control Block (SQLEDBCB),
must be locatable from processes which are created during or after connection to
a database. This Database Control Block contains vital information concerning
the location of the database, configurable database parameters, data areas
needed by code which services database requests and more. When needed
processes, like the Log Process, are created they have no knowledge of where
the Database Control Block is. By calling a Basic Support Utilities (BSU) function
and providing the database path specification, the corresponding Database
Control Block can be located. An anchor point for a chain of Database Control
Blocks is maintained in an area that is global to all processes - SQLEKRCB. The
location of this chain is known to BSU but not to application users, etc. This chain
is searched until the appropriate control block is located and then the
corresponding address is returned.
Without this function, Database Manager would have great difficulty in freely
creating other processes as needed. * Trademark of IBM Corporation.