Simple 9 ways to minimize the I/O operations and improving SAS performance : Epoch Research Institute India Pvt. Ltd. (www.epoch.co.in)

Simple 9 ways to minimize the I/O operations and improving SAS performance :

EpochResearch Institute India Pvt Ltd. (SASAuthorised Training : Ahmedabad | Bangalore)

 

As we all know that the factor that usually slows down the performance of SAS programs is Input/output (I/O). The execution of the programs will speed up by reducing I/O and ultimately reducing the costs.

So there are 9 ways to minimize the I/O and saving ultimately improving the performance of SAS program. They are listed below:

•      Try maximum to use the LENGTH statements wherever possible in order to minimize the variable length

•      Try to use CLASS statement rather than BY statement wherever possible as it might require a SORT

•      To minimize the observation length, one should use DROP and KEEP statement

•      There is no need to use SORT unnecessary. Use SORT only when it is required

•      Try to create multiple data sets within on DATA step whenever it is possible

•      Use WHERE statements with procedures. This is to be done in order to avoid the  subsetting in a DATA step followed by a procedure

•      When you don’t want to create a data set, use the _NULL_DATA_step. This usually arises when you tend to simple calculations or might want to create an external file or to produce a report

•      One should compress some of the large SAS data sets. But at this very moment, should be aware that compression can use more space in some cases as a result it may affect the SAS programming efficiency ultimately increasing the I/O

•     When you develop any program or test the program, always perform the task on a small subset of data

Note: Keep in mind that this list is wide-ranging and complete. These are few attempts to provide ideas to reduce I/O. All of the points may not reduce I/O time always.

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