Interview Questions.

Question 1. What Is Db2 (ibm Database 2)?

Answer :

DB2 is a subsystem of the MVS operating machine. It is a Database Management System (DBMS) for that running gadget.

Question 2. What Is An Access Path?

Answer :

The route that is used to get to records specified in SQL statements.

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Question 3. What Is An Alias?

Answer :

It is an change call that can be utilized in SQL statements to refer to a table or view inside the equal or faraway DB2 subsystem.

Question four. Explain What A Plan Is?

Answer :

Plan is a DB2 object (produced during the bind technique) that associates one or extra database request modules with a plan call.

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Question five. What Is A Db2 Bind?

Answer :

Bind is a method that builds “get admission to paths” to DB2 tables. A bind uses the Database Request Modules(s) (DBRM(s)) from the DB2 pre-collect step as enter and produces an application plan. It additionally checks the user’s authority and validates the SQL statements within the DBRM(s).

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Question 6. What Information Is Used As Input To The Bind Process?

Answer :

The database request module produced in the course of the pre-assemble. The SYSIBM.SYSSTMT desk of the DB2 catalog.

Question 7. What Is Meant By The Attachment Facility?

Answer :

The attachment facility is an interface among DB2 and TSO, IMS/VS, CICS, or batch cope with spaces. It permits software packages to access DB2.

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Question eight. What Is Meant By Auto Commit?

Answer :

AUTO COMMIT is a SPUFI choice that commits the results of SQL statements robotically if they are successfully carried out.

Question 9. What Is A Base Table?

Answer :

A base table is a real table - a table that bodily exists in that there are physical saved statistics.

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Question 10. What Is The Function Of Buffer Manager?

Answer :

The buffer supervisor is the DB2 element answerable for physically moving facts among an outside medium and (digital) garage (plays the actual I/O operations). It minimizes the quantity of physical I/O truly finished with state-of-the-art buffering strategies(i.E., examine-in advance buffering and appearance-apart buffering).

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Question 11. What Is A Buffer Pool?

Answer :

A buffer pool is most important garage that is reserved to meet the buffering necessities for one or more tablespaces or indexes, and is made from both 4K or 32K pages.

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Question 12. How Many Buffer Pools Are There In Db2?

Answer :

There are 4 buffer swimming pools: BP0, BP1, BP2, and BP32.

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Question 13. On The Create Tablespace, What Does The Close Parameter Do?

Answer :

CLOSE bodily closes the tablespace whilst no person is operating on the object. DB2 (release 2.3) will logically close tablespaces.

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Question 14. What Is A Clustering Index?

Answer :

It is a sort of index that (1) locates table rows and (2) determines how rows are grouped together inside the tablespace.

Question 15. What Will The Commit Accomplish?

Answer :

COMMIT will allow data adjustments to be permanent. This then lets in the statistics to be accessed with the aid of different gadgets of work. When a COMMIT happens, locks are freed so other applications can reference the just dedicated statistics.

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Question sixteen. What Is Meant By Concurrency?

Answer :

Concurrency is what permits a couple of DB2 utility method to get right of entry to the same facts at basically the equal time. Problems may additionally occur, which includes misplaced updates, get right of entry to to uncommitted records, and un-repeatable reads.

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Question 17. What Is Cursor Stability?

Answer :

It is cursor balance that “tells” DB2 that database values study by using this application are blanketed only at the same time as they're getting used. (Changed values are covered till this software reaches the commit factor). As soon as a application movements from one row to any other, different packages may additionally study or the first row.

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Question 18. What Is The Function Of The Data Manager?

Answer :

The Data Manager is a DB2 element that supervisor the physical databases. It invokes different device additives, as necessary, to perform specified capabilities including locking, logging, and bodily I/O operations (inclusive of seek, retrieval, replace, and index maintenance).

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Question 19. What Is A Database Request Module(dbrm)?

Answer :

A DBRM is a DB2 thing created by means of the DB2 pre-compiler containing the SQL source statements extracted from the utility application. DBRMs are enter to the bind process.

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Question 20. What Is A Data Page?

Answer :

A facts web page is a unit of retrievable facts, both 4K or 32K (relying on how the desk is defined), containing user or catalog records.

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Question 21. What Is Declaration Generator(dclgen)?

Answer :

DCLGEN is a facility that is used to generate SQL statements that describe a desk or view. These desk or view descriptions are then used to test the validity of different SQL statements at precompile time. The desk or view proclaims are utilized by the DB2I software DCLGEN to construct a host language shape, that's used by the DB2 precompiler to verify that accurate column names and statistics sorts were unique in the SQL assertion.

Question 22. What Does Dsndb07 Database Do?

Answer :

DSNDB07 is where DB2 does its sorting. It consists of DB2’s kind paintings vicinity and outside garage.

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Question 23. What Will The Free Command Do To A Plan?

Answer :

It will drop(delete) that current plan.

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Question 24. What Is A Host Variable?

Answer :

This is a data object this is used in an SQL declaration to acquire a fee or to supply a value. It have to be preceded by means of a colon (:) to inform DB2 that the variable isn't a column call.

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Question 25. What Will The Db2 Optimizer Do?

Answer :

The optimizer is a DB2 issue that techniques SQL statements and selects the get entry to paths.

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Question 26. What Is A Page?

Answer :

This is the unit of garage inside a desk area or index area that is accessed by using DB2.

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Question 27. What Is Pagespace?

Answer :

Pagespace refers to either to an unpartitioned table, to an index area, or to a single partition of a partitioned desk of index area.

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Question 28. What Is A Predicate?

Answer :

A predicate is an element of a search situation that expresses or implies a assessment operation.

Question 29. What Is A Resource Control Table(rct)? Describe Its Characteristics.

Answer :

The RCT is a desk that is defined to a DB2/CICS region. It consists of control characteristics that are assembled through the DSNCRCT macros. The RCT suits the CICS transaction ID to its associated DB2 authorization ID andplan ID(CICS attachment facility).

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Question 30. Where Are Plans Stored?

Answer :

Each plan is defined uniquely inside the SYSIBM.SYSPLANS desk to correspond to the transaction (s) which might be to execute that plan.

Question 31. What Is Meant By Repeatable Read?

Answer :

When an application application executes with repeatable examine protection, rows referenced by way of this system can’t be changed by other programs until the program reaches a commit factor.

Question 32. Describe What A Storage Group(stogroup) Is?

Answer :

A STOGROUP is a named collection of DASD volumes to be utilized by tablespaces and index areas of databases. The volumes of STOGROUP must be of the equal device kind.

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Question 33. What Is The Format (inner Layout) Of "timestamp"?

Answer :

This is a seven component fee that includes a date (yymmdd) and time(hhmmss and microseconds).

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Question 34. What Is Meant By A Unit Of Recovery?

Answer :

This is a chain of operations within a unit of labor(i.E., work completed between commit factors).

Question 35. Can Dasd Types Assigned To Storage Groups Be Intermixed(i.E., 3350s And 3380s)?

Answer :

No

Question 36. What Are The Three Types Of Page Locks That Can Be Held?

Answer :

Exclusive, replace, and percentage.

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Question 37. Can Db2 Be Accessed By Tso Users? If Yes, Which Command Is Used To Invoke Db2?

Answer :

DB2 may be invoked by means of TSO customers by the use of the DSN RUN command.

Question 38. How Are Write I/os From The Buffer Pool Executed?

Answer :

Asynchronously.

Question 39. What Is A Db2 Catalog?

Answer :

The DB2 catalog is a hard and fast of tables that comprise records approximately all of the DB2 objects(tables, views, plans and so forth.).

Question 40. In Which Column Of Which Db2 Catalog Would You Find The Length Of The Rows For All Tables?

Answer :

In the RECLENGTH column of SYSIBM.SYSTABLES

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Question 41. What Information Is Held In Sysibm.Syscopy?

Answer :

The SYSIBM.SYSCOPY desk contains records approximately image copies product of the tablespaces.

Question forty two. What Information Is Contained In A Syscopy Entry?

Answer :

Included is the call of the database, the table space call, and the photo replica type(complete or incremental and so forth.,) as well as the date and time each replica turned into made.

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Question forty three. What Information Can You Find In Sysibm.Syslinks Table?

Answer :

The SYSIBM.SYSLINKS table includes information about the hyperlinks between tables created by way of referential constraints.

Question forty four. Where Would You Find Information About The Type Of Database Authority Held By The User?

Answer :

SYSIBM.SYSDBAUTH.

Question forty five. Where Could You Look If You Had A Question About Whether A Column Has Been Defined As An Index?

Answer :

This records can be found in SYSIBM.SYSINDEXES.

Question forty six. Once You Create A View, Where Would Information About The View Be Stored?

Answer :

When a view is created, gadget data about the view is saved in SYSIBM.SYSVIEWS.

Question 47. What Is The Sql Communications Area And What Are Some Of Its Key Fields?

Answer :

It is a facts structure that must be blanketed in any host-language application the usage of SQL. It is used to skip comments approximately the sq. Operations to the program. Fields are return codes, mistakes messages, managing codes and warnings.

Question 48. Maxx Number Of Columns In A Db2 Table?

Answer :

224

Question forty nine. Explain The Use Of The Where Clause?

Answer :

It directs DB2 to extract facts from rows in which the fee of the column is the same as the cutting-edge value of the host variable.

Question 50. What Is A Foreign Key?

Answer :

It identifies a releated row in every other table and establishes a logical relationship among rows in two tables.

Question fifty one. What Technique Is Used To Retrieve Data From More Than One Table In A Single Sql Statement?

Answer :

The Join statement combines records from more that  tables.

Question 52. What Is The Maximum Number Of Tables That Can Be Joined ?

Answer :

fifteen

Question 53. What Are The Max. & Min. No. Of Partitions Allowed In A Partition Tablespace?

Answer :

minimum is four.Maximum is sixty four.

Question fifty four. Name The Different Types Of Table Spaces?

Answer :

1. Simple Table Space2. Segmented Table Space and3. Partitioned Table Space

Question fifty five. What Is The Maximum Number Of Tables That Can Be Stored On A Partitioned Table Space ?

Answer :

ONE

Question fifty six. How Do You Declare A Host Variable (in Cobol) For An Attribute Named Emp-name Of Type Varchar(25) ?

Answer :

01 EMP-GRP. 49 E-LEN PIC S9(four) COMP. Forty nine E-NAME PIC X(25).

Question fifty seven. How To See The Structure Of Db2 Table?

Answer :

Using QMF.

Question fifty eight. What Is The Difference Between Where And Having Clause?

Answer :

WHERE is for Rows and HAVING is for Groups

Question 59. What Does Dml Stand For And What Are Some Examples Of It?

Answer :

Data Manipulation Language. Some examples are SELECT, INSERT, DELETE, REPLACE.

Question 60. In A Db2-cics Program Which Is Acts As Co-ordinator And Which Is Participant?

Answer :

DB2 - player CICS- coordinator

Question 61. How Do U Achieve Record Level Locking In Db2 Versions When Record Level Locking Is Not Allowed?

Answer :

By having the period of the report greater than that of a web page!

Question 62. What Are The Levels Of Isolation Available With Db2v4?

Answer :

CS RR UR( brought new for DB2V4 which stands for uncommited examine which permits to retreive statistics from the space which has special locks also but statistics integrity might be affected if this selection is used )The pleasant available choice for records integrity & data concurrency is CS.

Question 63. What Is The Difference Between Type 1 Index & Type 2 Index?

Answer :

TYPE 1 & TYPE 2 are designated whilst an index is created at the table. TYPE 2 index is the option which comes with DB2V4. With TYPE 2 index information can be retreived quicker as only the statistics pages are locked and not the index pages. Hence TYPE 2 index is recommended.

Question sixty four. What Does Currentdata Option In Bind Indicate?

Answer :

CURRENTDATA alternative ensures block fetch whilst deciding on rows from a desk. In DB2V4 the default has been changed to NO. Therefore it's miles important to exchange all of the bind playing cards with CURRENTDATA(YES) that is default in DB2V3 & earlier to CURRENTDATA(NO).

Question sixty five. When Does The Sql Statement Gets Executed When You Use Cursor In The Application Programming ?

Answer :

square declaration receives carried out whilst we open cursor.

Question sixty six. What's The Maximum Number Of Volumes That Can Be Added To A Stogroup?

Answer :

The answer is 133.Usually it is going to be tough display more than three or four volumes to a Stogroup.

Question 67. Can You Define An Index If The Table Size Less Than 10 Pages?

Answer :

NO

Question sixty eight. What's The Percentage Free Space ?

Answer :

ZERO

Question sixty nine. What's The Error Code For Unique Index Voilation?

Answer :

-803

Question 70. What's The Best Locksize That You Could Use When You Create A Tablespace?

Answer :

The answer is Locksize = ANY.Unless you're Sure what is the Purpose of tablespace ie.,Read-best or R/W.If you use lock length =any, Db2 would routinely determine what form of locks it must use.

Question seventy one. What Is The Size Of A Data Page?

Answer :

4K to 8K

Question 72. Can All Users Have The Privilage To Use The Sql Statement Select * (dml)?

Answer :

NO THE USER SHOULD BE GRANTED PRIVILAGE TO USE IT.

Question 73. The Only Place Of Vsam Ksds In Db2 Is?

Answer :

BSDS is a VSAM KSDS.

Question 74. Max. No Of Rows Per Page?

Answer :

127

Question seventy five. What Are The Functions Of Bind?

Answer :

BIND specifically performs two matters syntax checking and authorization checking.It binds collectively all applications into an utility plan hence the call BIND.Apart from this bind has optimiser as a subcomponent.Its function is to determine the most useful get right of entry to approach.

Question seventy six. What Is A Corelated Subquerry?

Answer :

In a subquerry, if the outer querry reffers lower back to the final results of innerquerry it is known as corelated subquerry. That's why the outer querry is evaluated first in contrast to an everyday subquerry.

Question seventy seven. What Is The Difference Between Join And Union?

Answer :

be part of is used to retrive statistics from exceptional tables the usage of a unmarried square announcement.Union is used to mix the results of  or greater sq. Querries.

Question 78. When Can You Be Sure That A Query Will Return Only One Row?

Answer :

When you use the number one key and best the primary key inside the wherein clause.

Question seventy nine. What Is The Name Of The Default Db2 Catalog Database?

Answer :

DSNDB06

Question eighty. What Should Be Specified Along With A Cursor In Order To Continue Updating Process After Commit?

Answer :

With Hold option.

Question eighty one. What Is The Command Used By Tso Users To Invoke Db2?

Answer :

DSN RUN

Question eighty two. B37 Abend During Spufi?

Answer :

The b37 abend within the spufi is because of space necessities , the question has ended in so many rows that the spufi.Out record is not big sufficient to address it, growth the space allocation of spufi.Out record.

Question eighty three. How Many Bufferpools Are There In Db2 And What Are They?

Answer :

There are four Bufferpools.They are BP0,BP1,BP2 and BP32.

Question 84. What Is Join And Different Types Of Join?

Answer :

The ability to join rows and combaine records from two or extra tables is one of the maximum effective capabilities of relational machine.Three type of joins:

Equi-be part of
Non-equijoin
self-join.
Question 85. How Many Subqueries Can You Combine Together ?

Answer :

Total 16 queries and subqueries are 15