SAS Indexes

You cannot create an index with a DATA step or a PROC step.

The CONTENTS procedure does not display index information.

You cannot specify an index to retrieve particular observations by using the KEY= option in the SET and MODIFY statements. You also cannot specify a variable whose value is the observation number to be read by using the POINT= option. Finally, you cannot set a KEY= search to always begin at the top of the index for the data file by using the UNIQUE= option in the SET and MODIFY statements.

The MODIFY statement in the DATASETS procedure is not supported, which means that for a SAS data set you cannot submit the INDEX CENTILES statement to request that centiles be refreshed or change how often centiles are refreshed.

For a SAS data set, the fast-append method to append to an indexed data set is not supported.