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SAS System Options

IBUFSIZE= System Option

Specifies the buffer page size for an index file.
Valid in: configuration file, SAS invocation, OPTIONS statement, SAS System Options window
Category: Files: SAS Files
Restriction: Specify a page size before the index file is created. After it is created, you cannot change the page size.

Syntax Description
See Also


IBUFSIZE=n | nK | nM | nG | nT | hexX | MAX

Syntax Description

n | nK | nM | nG | nT

specifies the page size to process in multiples of 1 (bytes); 1,024 (kilobytes); 1,048,576 (megabytes); 1,073,741,824 (gigabytes); or 1,099,511,627,776 (terabytes). For example, a value of 8 specifies 8 bytes, and a value of 3k specifies 3,072 bytes.

The default is 0, which causes SAS to use the minimum optimal page size for the operating environment.


specifies the page size as a hexadecimal value. You must specify the value beginning with a number (0-9), followed by an X. For example, the value 2dx sets the page size to 45 bytes.


sets the page size for an index file to the maximum possible number. For IBUFSIZE=, the value is 32,767 bytes.


An index is an optional SAS file that you can create for a SAS data file in order to provide direct access to specific observations. The index file consists of entries that are organized into hierarchical levels, such as a tree structure, and connected by pointers. When an index is used to process a request, such as for WHERE processing, SAS does a search on the index file in order to rapidly locate the requested records.

Typically, you do not need to specify an index page size. However, the following situations could require a different page size:

Note:   Experimentation is the best way to determine the optimal index page size.  [cautionend]

See Also

"Understanding SAS Indexes" in SAS Language Reference: Concepts.

IBUFNO= System Option

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