How do you check if a VSAM file is empty or not?
By using IDCAMS repro also empty check can be done. If the return code is 4 (RC=4), then the file is empty. 3. If the return code is Zero (RC=0) then file is not empty otherwise it is empty and return code would be 12 if it is empty .
How do I handle an empty VSAM file?
A VSAM file that has never contained a record is treated as unavailable. Attempting to open for input will fail. An empty file can be opened for output only. When you open for output, COBOL will write a dummy record to the file and then delete it our.
How can check file is present or not in JCL?
JCL exists with any of the following ways:
- Issuing a shell command: If the data set exists, the return code is zero.
- Calling an API in Java programs: boolean exists = Datasets.exists( prefix+”.MY.JCL” )
- Calling an API in Python programs: Datasets.exists(“%s.MY.JCL” % HLQ)
How do I know if a file is empty in mainframe?
Empty File check using – ICETOOL You can use ICETOOL’s COUNT operator to set a return code of 12, 8 or 4 if a specified data set is EMPTY, NOTEMPTY, HIGHER(n), LOWER(n), EQUAL(n) or NOTEQUAL(n), where n is a specified number of records (for example, 5000). If RC4 operand is specified, ICETOOL sets RC=4.
How do I check if a file is empty in mainframe?
What will happen when you open an empty VSAM file?
what will happen if empty vsam file is opened for input? bye, ks reddy. nothing, when u will try to read on the first read only it will give eof reached.
How do I empty a JCL file?
If you have an input file and after successfully reading the data your requirement is to “empty” the file you can do this within your COBOL program that reads the file. Open the file as input and read until end-of-file. When the AT END is reached, close the file. NOW – open the file as output and close the file.
What are the different types of VSAM files available?
You can use VSAM to organize records into four types of data sets: key-sequenced, entry-sequenced, linear, or relative record. The primary difference among these types of data sets is the way their records are stored and accessed.
How does Cobol handle empty files?
When u try to read an empty input file then the file-status will be NON ZERO (i.e) 35. so check the file status if it is ’35’ then u read an empty input file. Then abort or do the exception wat ever u need. Be carefull with “empty files” on the mainframe.
When to use the omit statement in icetool?
An OMIT statement is used with COUNT to delete the header and trailer record, leaving only the data records as a subset of the INPUT data set. ICETOOL sets RC=4 (because the RC4 operand is specified) if the subset of records is empty, or RC=0 if the subset of records is not empty.
How to check whether a PS or VSAM file is empty?
Here are some of the commonly used methods to check whether a Physical Sequential (PS) or VSAM File is empty or not. 1. By Using IDCAMS utility we can check whether the file is empty or not. If the return code is 4 (RC=4), then it is considered as empty. 2. By using IDCAMS repro also empty check can be done.
Can a VSAM file be opened for input?
A VSAM file that has been defined but never loaded with any records cannot be opened for input — period. A VSAM file that has been opened for output, had a record written to it, then closed — even if the record is then deleted — can be opened for input. Re: How to check whether VSAM is empty or not through JCl?
How to tell if a data set is empty in icetool?
ICETOOL sets RC=8 (because the RC8 operand is specified) if the IN data set is empty, or RC=0 if the IN data set, is not empty. ICETOOL only reads one record to determine if the data set is empty or not empty, regardless of how many records there are in the data set.