How do I reduce the size of a SAS dataset?
How do I reduce the size of a SAS dataset?
To create a compressed SAS data set, use the COMPRESS=YES option as an output DATA set option or in an OPTIONS statement. Compressing a data set reduces its size by reducing repeated consecutive characters or numbers to 2-byte or 3-byte representations.
What does compress in SAS do?
COMPRESS function is basically used to compress/removes all the spaces/blanks in a character string. In other words, it removes leading, between and trailing spaces from the strings.
What does _N_ mean in SAS?
What is the automatic variable _n_? When you open a SAS data file in a data library, you will notice the observations are numbered at the first column. The automatic variable _n_ represents the observation numbers. This variable hidden in the DATA step is simple yet powerful in programming practice.
How big can a SAS dataset be?
2 gigabytes
Hi, In most cases, the maximum file size for a SAS data set is 2 gigabytes (GB).
Can SAS handle large datasets?
As SAS programmers we often have to work with large data, having millions of rows, hundreds of columns. Usually it takes enormous time to process these datasets which can have an impact on delivery timelines.
How can I improve my SAS performance?
To improve the performance of a SAS job, we must reduce the number of times SAS accesses disk or tape devices. We can reduce the number of data accesses by processing more data each time a device is accessed by setting the BUFNO=, BUFSIZE=, CATCACHE=, and COMPRESS= system options.
How do I compress in SAS?
To remove digits and plus or minus signs, you could use the following function call: COMPRESS(source, “1234567890+-“); compress(source, “+-“, “d”); The COMPRESS function allows null values and SAS missing values in the second argument. A null or missing value is treated as a string that has a length of 0.
How do I get rid of middle space in SAS?
One of the most used functions in SAS to remove blanks is the STRIP-function. Like the TRIM- and TRIMN-functions, the STRIP-function removes trailing blanks. However, the STRIP-function also removes the leading blanks from a string.
What does if _N_ 1 mean in SAS?
applications of the “IF _N_=1 THEN SET dsname” feature of the. SAS Data Step. It allows merging one record-datasets to multiple- record datasets.
What is @@ in SAS?
@@ holds an input record for the execution of the next INPUT statement across iterations of the DATA step. This line-hold specifier is called double trailing @.
How do I check the size of a SAS dataset?
Estimating the Size of a SAS Data Set
- Use PROC CONTENTS to determine the size of each observation.
- Multiply the size of each observation by the number of observations.
- For V6 engines, add 10% for overhead.
- The result of this calculation will be in bytes.
How many rows can SAS handle?
SAS does not have any limitation on the size of a file during read operations, although it’s possible you might run into a limit on the number of observations written to a new SAS data set. On a 64-bit system, that would be 2**63-1, about 9.2 quintillion observations. You are more likely to run out of disk space.