Optimizing Performance

Introduction 145 Collecting Performance Statistics 146 Logging SMF Statistics 146 Optimizing I/O 147 Put catalogs and data sets into separate libraries, using the optimal block size for each 147 Use the optimal buffer size and buffer number for your data 147 Determine whether you should compress your data 148 Consider placing SAS data libraries in hiperspaces 149 Consider designating temporary SAS libraries as virtual I/O data sets 150 Efficient Sorting 150 Consider changing the values of SORTPGM= and SORTCUTP= 150 Take advantage of the DFSORT performance booster 151 Some SAS System Options That Can Affect Performance 151 MAUTOSOURCE and IMPLMAC 151 REXXMAC 151 SPOOL/NOSPOOL 152 VECTOR/NOVECTOR 152 Managing Memory 152 Specify a value for MEMSIZE= when you invoke SAS 152 Specify a value for MEMLEAVE= 153 Consider using superblocking options to control memory fragmentation 153 Use SYSLEAVE= and PROCLEAVE= to handle out-of-memory conditions 153 Loading SAS Modules Efficiently 154 Use a bundled configuration of SAS 154 Other Considerations for Improving Performance 154 Leave AUTOSCROLL 0 in effect for the LOG and OUTPUT windows 154 Use the EM3179 device driver when appropriate 155 Consider using the direct log-on procedure to invoke SAS 155