SAS(R) 9.1.3 Companion for z/OS

CHAPTER
10
Optimizing Performance
Introduction to Optimizing Performance 212
Collecting Performance Statistics 212
Logging SMF Statistics 213
Optimizing I/O 213
Put Catalogs and Data Sets into Separate Libraries, Using the Optimal Block Size for Each 213
Optimize I/O for Direct Access Bound Libraries 213
Sequential Processing Pattern 214
Random Processing Pattern 214
Optimize I/O for Sequential Libraries 214
Determine Whether You Should Compress Your Data 215
Consider Using SAS Software Compression in Addition to Hardware Compression 216
Consider Placing SAS Data Libraries in Hiperspaces 216
Examples of Using the HIPERSPACE Engine Option 216
Controlling the Size of a Hiperspace Library 217
Hiperspace Libraries and DIV Data Sets 217
Performance Considerations for Hiperspace SAS Data Sets 217
Consider Designating Temporary SAS Libraries as Virtual I/O Data Sets 217
Efficient Sorting 218
Consider Changing the Values of SORTPGM= and SORTCUTP= 218
Take Advantage of the DFSORT Performance Booster 218
Some SAS System Options That Can Affect Performance 218
MAUTOSOURCE and IMPLMAC 218
REXXMAC 219
SPOOL/NOSPOOL 219
Managing Memory 219
Specify a Value for MEMSIZE= When You Invoke SAS 219
Specify a Value for MEMLEAVE= When You Invoke SAS 220
Consider Using Superblocking Options to Control Memory Fragmentation 220
Memory Cheat Sheet for z/OS 220
Use SYSLEAVE= and PROCLEAVE= to Handle Out-of-Memory Conditions 220
Loading SAS Modules Efficiently 221
Use a Bundled Configuration of SAS 221
Other Considerations for Improving Performance 221
Leave AUTOSCROLL 0 in Effect for the LOG and OUTPUT Windows 221
Use the EM3179 Device Driver When Appropriate 222
Consider Using the Direct Logon Procedure to Invoke SAS 222
211