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Table of Contents
How do I view VSAM files in COBOL?
- Establish a Key. START statement positions the cursor. …
- READ Statement. The purpose of READ statement is to fetch a record randomly after establishing a key. …
- READ NEXT Statement. READ Next fetches records sequentially till end of the input VSAM file. …
- Write a Record.
How do I browse a KSDS file?
For starting a browse of a KSDS, you may use the options EQUAL (key equal to) and GTEQ (key greater than or equal to), and they have the same meaning as on the READ command. However, option GTEQ is the default for the STARTBR command, whereas EQUAL is the default for the READ command.
VSAM file handling
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How do I edit a VSAM file?
- Type I on the command line of the Edit Data Set screen. A pop-up window displays requesting the inserted record length.
- Specify the new record length.
- Press Enter. …
- Update the key value. …
- Modify the record length if necessary by using the V line command.
How do I read a VSAM file dynamically?
- Retrieve the first record randomly (with a random-retrieval READ ) based on the key of 1500.
- Read sequentially (using READ NEXT ) until the salary field exceeds 2000.
- Retrieve the next record randomly, based on a key of 2500.
- Read sequentially until the end of the file.
How do you read a VSAM with a partial key?
- START (F), then READ-NEXT (G) Return code from START is 23.
- START-GREATER-THAN (N), then READ-NEXT (G) Return code from S-G-T is 00, return code from READ-NEXT is also 00, but the record retrieved was the first record in the VSAM, not the key requested.
What are VSAM files in COBOL?
VSAM is a file storage access method used in MVS, ZOS and OS/390 operating systems. It was introduced by IBM in 1970’s. It is a high performance access method used to organize data in form of files in Mainframes. VSAM is used by COBOL and CICS in Mainframes to store and retrieve data.
Can we access the VSAM file only with the alternative index?
Normally a VSAM file is accessed via Primary key. This primary key cannot have duplicate values. In practical applications, one would need to access the VSAM file by way of fields other than the primary key also. In such cases, Alternate index is used for accessing a VSAM file.
What is VSAM KSDS file called?
A key-sequenced data set (KSDS) is a type of data set used by IBM’s VSAM computer data storage system. Each record in a KSDS data file is embedded with a unique key.
What is RRDS VSAM?
Relative record data set (RRDS)
Records in an RRDS can be fixed or variable length records, and the way in which VSAM handles the data depends on whether the data set is a fixed or variable RRDS. A fixed RRDS has fixed-length slots predefined to VSAM, into which records are stored.
How do I open a VSAM file in mainframe?
…
To initially load a VSAM file:
- Open the file.
- Use sequential processing ( ACCESS IS SEQUENTIAL ). …
- Use WRITE to add a record to the file.
Random Read VSAM file using KEY value
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How do I add data to a VSAM file?
Use the COBOL WRITE statement to add a record to a file without replacing any existing records. The record to be added must not be larger than the maximum record size that you set when you defined the file. Your program should check the file status key after each WRITE statement.
How do I load data into VSAM?
REPRO command is used to load data into VSAM dataset. It is also used to copy data from one VSAM data set to another. We can use this command to copy data from sequential file to VSAM file. IDCAMS utility uses REPRO command to load the datasets.
How do you read next record in Cobol?
Syntax. READ file-name NEXT RECORD INTO ws-file-structure AT END DISPLAY ‘End of File’ NOT AT END DISPLAY ‘Record Details:’ ws-file-structure END-READ. NEXT RECORD is optional and is specified when an indexed sequential file is being read sequentially. INTO clause is optional.
What is the difference between random access and dynamic access in Cobol?
random access mean you randomly locate the record using RBA for ESDS , RRN for RRDS and Primary key for KSDS and your search goes record by record. dynamic access means you dynamically locate a record and from there you perform sequential operation.
What is the difference between VSAM and DB2?
VSAM is a file access method, while DB2 is a database management system (DBMS). VSAM, or Virtual Sequential Access Method, is a methodology for the indexed or sequential processing of records on direct access devices.
What is the difference between PS file and VSAM file?
In physical sequential file records are stored in terms of blocks,where as in VSAM files records are stored in ControlInterval(C.I). 2. PS files can be created on tapes while the VSAM files cannot. And (probably that’s why) VSAM files can have ALTINDX(alternate index) while no such facility exists for PS files.
Is VSAM a database?
The challenges of VSAM are straightforward – the business wants to leverage the data housed in VSAM, but it’s not a database. It’s a file management system. Loosely speaking, therefore, it is ‘closer to the disk’ than the database management system (DBMS) is.
What is the purpose of Bldindex?
BLDINDEX command is used to build the alternate index. BLDINDEX reads all the records in the VSAM indexed data set (or base cluster) and extracts the data needed to build the alternate index.
VSAM Refresher in 30 Minutes
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How do I copy one VSAM file to another?
Easiest way to copy an existing VSAM file to a new VSAM file is by using FILE-AID. Go to FILE-AID —> then go to option 3 —> From there again go to option 3 , which is FILE-AID COPY Utility.
What is VSAM file in mainframe?
VSAM or Virtual Storage Access Method is a file storage access method used in MVS, ZOS, and OS/390 operating systems. It was introduced by IBM in 1970’s. It’s a high-performance access method to organize data as files in mainframes. VSAM is used by programming languages in mainframes to store and retrieve data.
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