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Top 50 Mainframe Interview Questions & Answers . If COMMON attribute will not be specified, the nested programs will find Download PDF. + Ibm Mainframe Interview Questions and Answers, Question1: What is use of linkage section? Question2: How To get the last record in VSAM file in cluster?. download Mainframes Interview Questions And Answers in pdf,doc,zip formats. visit for more Mainframes Interview Questions And Answers to download in pdf.
While going for a mainframe interview, if you make sure that you possess smart information and skills in this field, then the possibilities of your selection got increases. Though every interview is different and the scope of a job is also different, we can help you out with the top Mainframe Interview Questions and Answers, which will help you take the leap and get you success in your interview. In this article, we have covered Top 10 Mainframe Interview Questions and Answers these questions are divided into two parts which are as follows:. It has the most user-friendly connectivity, single thread performance, and reliability factors. Traditionally, mainframes were related to instead of distributed computing, Distinction is blurring smaller between traditional centralized computing and distributed computing because small computers become additional powerful and mainframes become additional multi-purpose.
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If table is empty then we alter this column to any length, but if some data get inserted into the table then we can also decrease the column length up to largest data size available in that particular column.
Question 7. One can use Inner Join to get data from two tables. Question 8. Question 9.
Question Dead lock timeout error occurs in the following case: If two or more programs acquired exclusive lock on the data,which may be needed for other programs without that data which can not proceed further. You can roll back current unit of work for one of the programs after preset time interval for deadlocks and terminate that program. We can increment the count for each reading of record in a file.
Label record is standard means it will use disk files. But tape files can have standard label too.
If the label record is omitted it should be a the tape file without any begin and end blocks on the tape. In the most significant bit. The verb can be used to increment one or more identifiers by a positive integral value.
Can rewrite record length must be same , but not delete. The difference between Static and Dynamic Call is that the first has the invoking program name hard coded into the call statement while the second has it in storage in an identifier.
Also in the case of Static the invoking program is link edited with the invoked subroutine and in the case of Dynamic Callwe will have a different module for each: Cataloged procedures are invoked through a specification of the name of the procedure over the Exec statement and cataloged on the library of the procedure.
For verifying a procedure prior to becoming a catalog procedure we will use an in-stream procedure. Instream procedures are similar to catalog procedures but there is a small difference at their execution: Start is used for the beginning of new transactions and then the XCTL takes the operations further , transferring the control to a different application but with an equal transaction ID. Evaluate statement is a different way for the neste IF statements and it works by choosing from a processing actions list.
To replace IF we can use When to find out if an action will be taken. Like IF , When control goes from evaluate to the following statement on the application. The types of evaluate statement are trues and variable-name. If an entry is already there the catalog would send us an error message.
The issue can be repaired by uncataloging or deleting the primary data set and we must find that volume which contains the new data set and we must catalog it. When we want to switch to Descending we have to provide the Descending Key clause in the time we define the array which will be sorted; the table has to be loaded in the order stated.
The right time is when the perform body is not used. If it is a type of code that has general means, being utilized in several locations in the program, the code should be met in a different para and not use in-line perform, but perform paraname instead.
The main thing to do is repairing the problematic data, usually the cause for problems with SOC-7 is a numeric item that is un-initialized, this is the primary concern. Some of the setups give us dumps for run-time abends, this can also be made by invoking OS services or subroutines via the assembly language.
After that the bug can be found in the source code. For capturing the runtime dumps, we should define datasets like for instance Sysabout in JCL. When these methods are not working we must find the error source with judgement and Display. If the setup has debugging utilities, we should make use of them.
If we use binary items that are found at the boundaries of words in memory, these ones have a more rapid address resolution. The size of word from mainframe memory is four bytes. So every word has to begin from an address which is divisible by four.
When the primary variable is x 3 and the next one is s9 4 comp if the Sync clause is not specified, the second variable will begin from byte 3. When Sync is specified the beginning address will be 4; this more rapid, even if we may notice a little waste of memory. These two are options of the compiler for verifying the out of range state for the subscript. A Control Area is a set of Control Intervals and it works during allocation.
The size of the Control Area depends on the type of allocation cyl, tracks, records and ots maximum reaches 1 cylinder. The Control Interval is something like a block for QSAM files, its size is ranged between bytes and 32 kilobytes, normally 2 or 4 kilobytes. If the Control Interval is bigger the performance will also increase when it comes to sequential processing.
The size of CI has to depend on the length of the record and the processing type. The normal value is 4 kilobytes but when the length of the record is bigger than 1 kilobyte we have to pick 6 kilobytes or 8 kilobytes. Empty files can just be opened for output, case in which a dummy record will be written by COBOL and the file will be erased. This is what we call a model dataset, whose ds name has to be similar to the one of the GDG.
Ibm Mainframe Tutorial. Ims, Db2 And Ispf.
Ibm Mainframe Practice Tests. IT Skills. This results in the formation of a relation between the two tables. It limits the changes that can be made to the primary key from a foreign key. When two independent processes contend for the same resource or the resources reserved by one another, it is called a deadlock.
In this type, the data pages get locked, but the index pages are not locked. Therefore, TYPE 2 index are faster. HIDAM has a separate index file which is based on the root segment. This file has information regarding the pointer that marks the position of the data.
On the other hand, HDAM file does not have separate index file, but the key field of every record is passed through a randomizer which places the record to a particular position in the database. It is the rule that states that consistency needs to be conserved between the foreign and primary keys. This means that each foreign key entry needs to have a fitting primary key entry. Multiple index are two indexes, one each for a column of the same table.
Composite index is only one index, which consists of combined values of 2 columns of a table.
It lowers the requirement for executing intensive relational joins. It also cuts the number of required foreign keys. DBD, short for Database Descriptor, restricts access to the database when objects get altered, created or dropped. Volumes can be inserted up to Tables, which are related through a foreign key, are known as delete-connected tables.
This is because whenever any entry in the primary key is deleted, it affects the values in the foreign key table too. The DBD only allows entry to one object at a particular time. Lock contention is said to happen when more than one object seeks permission for execution simultaneously. It is a menu-driven tool which the developers use to make objects in the database. It is a substitute to a synonym. Aliases are developed for distributed environments so as to avoid the use of location qualifier of a view or table.
It is not dropped when the table gets deleted. Isolation level is the degree to which the activation group in focus is isolated from the activation groups executing at the same time. It is an MVS message that indicates the presence of a duplicate catalogue in the database. This problem can be fixed by removing one of the entries and then adding a new one. It determines the location of the program, which called the EXEC statement. It is not possible to use it for catalogued procedures. It determines the dataset in which the program exists.
It applies only to one step and not the entire job. In JES3, the allocation of data sets for the steps takes place even before the job is scheduled for execution. While in JES2, this allocation takes place just before the execution of each step.
Yes, the order is significant as the evaluation takes place in the top to bottom manner and, therefore, the order has a large impact in the determination of results. Scope terminators are always declared explicitly to improve readability. Linkage Sections is where shared items are declared and defined.