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VSAM Virtual Memory
What is the Virtual Memory Size for VSAM?
kuganraja
- Dec 28th, 2009
Virtual Memory deals with Operating System and VSAM deals with access method.Virtual memory depends on the addressing mode of the operating system.
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VASM Share Options
What are the share options in VSAM, CA, CI? What is the syntax? How does it work?
kuganraja
- Dec 28th, 2009
SHAREOPTIONS(region system) -> deals with the cross region and cross system sharing of the VSAM dataset.For region 1,2,3,4 are the valid optionFor syste 1&2 are reserved 3&4 are valid option
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What is the maximum no. of records that can be allowed in VSAM?
dhs01
- Apr 15th, 2009
At one time, can't say if this restriction still exists but it had to do with the ability to address the records. Because VSAM only allowed for even numbers, the addressing allowed for 4G of data, so the number of records was limited to what could be fit into that size space.
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Access the Last Record
How we can access the last record from KSDS file?
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What is the difference between CI( CONTROL INTERVAL)and CA(CONTROL AREA). I refereed SAB A ZAMIR JCL book in that he said collection of CI is called CA but in next page (286) he explained this with showing one CI as a CA. Can you please let me know the difference?
rb333
- Apr 15th, 2009
Both the statements are true. Collection of CI's is called CA means one or more than one CI together forms a CA. In case, a CA comprises of only one CI it means CI=CA in that case. Hope i answer your question.
venkat.palla
- Aug 7th, 2007
CI and CA in VSAM are the acronyms for Control Interval and Control Area respectively. Basically CI is the area within which group of records are stored. Collection of CIs are stored in CA. CIs will t...
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VSAM-ESDS-AIX
When its not possible to read ESDS file randomly through COBOL program then what is the use of creating AIX for that file? If reading that file randomly is possible then plz give me the details. I tried but without success.
dhs01
- Apr 15th, 2009
Basically the previous answers have all hit around the issue. My understanding is that you should use IMPORT and EXPORT if you want to take a dataset that is in one catalog and get it into another catalog. REPRO is fine for creating a backup copy.
dhs01
- Apr 15th, 2009
I believe AIX is built on either RBA or RRA (Relative byte address or relative record address) so if you did a read using these, you should be able to 'randomly' read the file. I believe you would also have to request something like skip sequential processing.
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What is the maximum record length for the VSAM dataset?
dhs01
- Apr 15th, 2009
What do you mean by record size? Are you asking about physical terms or logical? I can't say about current vsam but at one time the records were 512,1024,2048, and 4096. CIs which are the logical ...
Ravi
- Aug 4th, 2007
The maximum record length has been told during the discussion However would like to just emphasize correctly.Tape :-28627 Disk :32767 The maximum can be one cylinder=1 CI
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Why VSAM concept came into existence ?
dhs01
- Apr 15th, 2009
VSAM was written as a replacement for ISAM. The main problem with ISAM was that if there were many insertions and deletions the way he chained the entries was horribly inefficient. VSAM through the use of splitting CIs was a hugh improvement.
KF
- Nov 16th, 2006
Why did VSAM come into existance? Think DOS VS! Using VSAM was much, much easier than coding masses of inflexible DLBL and EXTENT cards for running jobs in DOS VS.
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Can we use AIX in ESDS? If yes,explain?
stuartslom
- Feb 18th, 2009
YES!AIX for ESDS RECSZ = 5 + AIXKL + (n x 4) Where: AIXKL is the alternate-key length n = 1 when UNIQUEKEY is specified n = the number of data records in the base cluster that contain the same alternate-key value, when NONUNIQUEKEY is specified.
Anilsodadasi
- Mar 27th, 2007
ESDS is a NonIndexed file. How can we create Alternative index file?. It's not posible to use AIX for ESDS.
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In vsam why we use export-import utility?
Shashank Gite
- Jan 3rd, 2009
EXPORT-IMPORT UTILITY is used to take a back along with the attributes of the VSAM file and restore the back with the same attributes respectively.We can use REPRO to take back up it will not cop...
Basu
- Jul 12th, 2006
Export utility is used to take a backup of VSAM dataset in tape and then import utility is used to restore that dataset again from tape
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How do you compile a program in Endevor?
kousikgeek
- Oct 25th, 2008
I think the question is how to compile an existing program in unit test or SIT or any region by Endeavor. If the question is just to complie the existing program but not to add the changes to Endeavor...
Srinivas
- Oct 31st, 2007
Guys,Every application needs to setup in Endevor as System & Subsystem names.Then each type like cobol, jcl, etc should need to be defined under that application in Endevor. Then the actual core work ...
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How do you convert flat files to VSAM files?
kousikgeek
- Oct 25th, 2008
Following steps will convert a sequential file to VSAM file.1. Sort the sequential fille, with SORT FIELD=NONE, to remove the duplicate key records.2. Define a VSAM file3. Use REPRO to copy the sequential file to VSAM file.
Etnad
- Nov 18th, 2007
You can convert flat files to VSAM:1. Identify what will be your primary key. If you don't want to, the whole record can be?your primary key.2. Sort the file by primary key or the whole record (if no...
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What is the difference between vsam files and non-vsam files?
uma_mca2007
- Jul 1st, 2008
VSAM files are used when we want to store data based on some key fields(Eg: KSDS)access method is indexed.NON VSAM files like PS are used when we want to store data which is not unique and also the access is sequential.
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For accessing a VSAM cluster sequentially, STARTBR, READNEXT, ENDBR commands are used. Suppose the VSAM cluster is sorted on the basis of a field (lets say age) and using STARTBR pointer is positioned on the record with name 'brijesh'. By using READNEXT that record is read. Now if i again use READNEXT, next record will be read(which could be the record with name other than 'brijesh'). If I want to read the next record with the same name (i.e. brijesh), whether RESETBR will be correct option for me. By using RESETBR here, whether the pointer will be placed at the next record with same name(brijesh) or the first record with the name 'brijesh'. Please explain the same.
sai mainframes
- Jun 20th, 2008
Hi Brijesh,I guess your question is purely dependent on the situation(i.e data present in the dataser which you are accessing)when ever you sorted the data with age, it will sort like depend on age on...
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How can we check the amount of free space available for a VSAM dataset?
sai mainframes
- Jun 20th, 2008
For any information related to VSAM dataset, we can code LC(LISTCAT) before the name of dataset. then it will display the entire information about that particular VSAM dataset.for space used....it wil...
kkreddy98
- Aug 25th, 2007
Using LISTCAT command we can get all the information regarding the VSAM filethanks,kotireddy k.
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Explain the VSAM error code 118
Sreyoshi
- Feb 12th, 2008
The data set name is ineligible for RACF definition. User does not have authority (reason code0) or RACF inactive (reason code 12).
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What is the disadvantages of VSAM file?
thesmarttechie
- Nov 29th, 2007
The primary disadvantage of VSAM is that it cannot be stored on TAPE Volume. In case you are handling huge amount of data, many cyclinders will have to be allocated which is not cost-effective compare...
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What is an Alternate Index? How to give the Max Record Length and Avg. Record Length?
lokeshheda
- Jul 9th, 2007
aix is nothing but a file by which we can featch a records by using a key other than primary key.
sureshnachiappan
- Nov 23rd, 2006
In ksds we will defining keys(5 0) this is a primary key. this a numeric but if we want some character as a key we going for alternateindex.using AIX we can retrieve records. recordsize(avg max)
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How to find corrupted record in lengthy vsam file
kckinney
- May 25th, 2007
Corruption can happen in many ways. The dataset itself may be dirty, which can cause S0C7 abends in poorly written programs.CA/CI's can be corrupted, which may lead to S0C4 or Sx13 abends.Can you be more specific? The remedy is very different depending on what is corrupted.RTM,kk
VSAM Interview Questions
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