db_server

ClearCase database server program

APPLICABILITY

ClearCase (administrative command)

SYNOPSIS

Invoked as needed by the albd_server program

DESCRIPTION

A host's db_server processes handle VOB database transactions on that host, in response to requests from ClearCase client processes throughout the network: clearmake, cleartool, and so on. These programs do not access VOB databases directly. Instead, they send database transaction requests to a db_server process, which runs on the host where the VOB storage area resides (the VOB host). The db_server process, running under the group name clearcase (inherited from the albd_server, which spawns it), performs the actual database access. Database transactions include the following:

• Creating and modifying metadata (such as attaching a label to a version)
• Reading metadata (such as finding the labels attached to a version)
• Writing event records (such as the one that records a checkout command)
• Writing configuration records
• Reading event records and configuration records

Each db_server process services a single client (at a time), but can operate on any number of VOBs. A client establishes a connection to a db_server with the help of the albd_server on the VOB host. The connection is made either with an available db_server, or with a newly created one. The connection is broken when the client exits (or fails to make a database transaction over an extended period). At that point, the db_server becomes available for use by another client; eventually, an unconnected db_server is terminated by albd_server.

ERROR LOG

The db_server process sends warning and error messages to the Windows event log.

SEE ALSO

albd_server