IDMSRSTT Macro Statements › IDMSRSTT BUFSIZE › IDMSRSTT BUFSIZE Parameter

IDMSRSTT BUFSIZE Parameter

new-buffer-size

Specifies the size, in bytes, of a buffer large enough to hold the largest restructured record, as defined in the new schema.

Usage

IDMSRSTT BUFSIZE must be the first macro statement coded for each base restructuring table you assemble.

IDMSRSTC buffer-size values

The IDMSRSTC utility calculates the values of old-buffer-size and new-buffer-size to be the length of the largest record in the applicable schema, rounded up to the nearest multiple of four. The record length equals:

• The length of the prefix
• Plus the length of the data portion
• Plus, for variable-length records, an 8-byte overhead

Estimating buffer-size values

When coding the IDMSRSTT BUFSIZE statement manually, make a generous estimate for the old-buffer-size and new-buffer-size parameters. For example, round the calculated record length up to the nearest multiple of 100.