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IDMSDBIO

IDMSDBIO uses the DMCL load module to determine how to access the database physical files. The DMCL contains a device definition for each file that is used for all I/O operations. Using this information, IDMSDBIO builds the appropriate I/O commands to read or write the requested page.

IDMSDBMS calls IDMSDBIO to perform the following functions:

  • open and close disk files

  • allocate, release, vary and lock buffers

  • lock and unlock areas

  • read and write pages

  • open, close, read, write and vary journals

  • load and delete programs