DB2 is a Database Management System for the MVS Operating System Top 50 DB2 Interview Questions & Answers .. Download PDF. Here are top 34 objective type sample DB2 Interview questions and their answers are given just below to them. These sample questions are framed by experts. DB2 INTERVIEW QUESTIONS AND ANSWERS MAINFRAME Interview Questions faqs DB2 ibm db2 sql interview questions and answers.
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+ Ibm Db2 Interview Questions and Answers, Question1: What is DB2 (IBM Database 2)? Question2: What is an access path? Question3: What is an alias?. IBM DB2 Interview Questions and Answers - Free download as PDF File .pdf), Text File .txt) or read online for free. IBM DB2 Interview Questions and Answers. DB2 Interview Questions - Learn DB2 Concepts in simple and easy steps starting and later they continue based on further discussion and what you answer −.
Avoid having to bind a large number of DBRM members into a plan 2. Avoid cost of a large bind 3. Avoid the entire transaction being unavailable during bind and automatic rebind of a plan 4. Minimize fallback complexities if changes result in an error. It has not physical existence. Main usage is to group packages. What do you do? Off late, I find that the performance has deteriorated.
What happened? It also collects statistics used for space management.
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These statistics are stored in DB2 catalog tables. When is it used? REORG reorganizes data on physical storage to reclutser rows, positioning overflowed rows in their proper sequence, to reclaim space, to restore free space.
It is used after heavy updates, inserts and delete activity and after segments of a segmented tablespace have become fragmented. A state in which, an image copy on a table needs to be taken, In this status, the table is available only for queries.
You cannot update this table. It means that the LOAD utility did not perform constraint checking.
A mandatory index defined on a partitioned table space. Only one. What Is A Data Page?
DB2 Interview Questions
A data page is a unit of retrievable data, either 4K or 32K depending on how the table is defined , containing user or catalog information. What Is Declaration Generator dclgen? These table or view descriptions are then used to check the validity of other SQL statements at precompile time. What Does Dsndb07 Database Do? What Is A Host Variable? This is a data item that is used in an SQL statement to receive a value or to supply a value. It must be preceded by a colon: This is the unit of storage within a table space or index space that is accessed by DB2.
What Is Pagespace?
Pagespace refers to either to an unpartitioned table, to an index space, or to a single partition of a partitioned table of index space. What Is A Predicate? A predicate is an element of a search condition that expresses or implies a comparison operation. Describe Its Characteristics. Where Are Plans Stored?
This is a seven part value that consists of a date yymmdd and time hhmmss and microseconds. This is a sequence of operations within a unit of work i. What Is A Db2 Catalog? The DB2 catalog is a set of tables that contain information about all of the DB2 objects tables, views, plans etc.
Included is the name of the database, the table space name, and the image copy type full or incremental etc. It is a data structure that must be included in any host-language program using SQL.
It is used to pass feedback about the sql operations to the program. Fields are return codes, error messages, handling codes and warnings. It directs DB2 to extract data from rows where the value of the column is the same as the current value of the host variable.
What Is A Foreign Key? It identifies a releated row in another table and establishes a logical relationship between rows in two tables.
The Join statement combines data from more that two tables. What Are The Max. Simple Table Space2. Segmented Table Space and3.
Partitioned Table Space. Data Manipulation Language. By having the length of the record greater than that of a page!
1. What are foreign keys?
With TYPE 2 index data can be retreived faster as only the data pages are locked and not the index pages. Hence TYPE 2 index is recommended. The answer is Usually it will be difficult monitor more than 3 or 4 volumes to a Stogroup. What's The Percentage Free Space? Unless you are Sure what's the Purpose of tablespace ie. No Of Rows Per Page?
BIND mainly performs two things syntax checking and authorization checking. It binds together all packages into an application plan hence the name BIND.
Apart from this bind has optimiser as a subcomponent. Its function is to determine the optimum access strategy. What Is A Corelated Subquerry? In a subquerry, if the outer querry reffers back to the outcome of innerquerry it is called corelated subquerry.
That's why the outer querry is evaluated first unlike an ordinary subquerry. When you use the primary key and only the primary key in the where clause. B37 Abend During Spufi? The b37 abend in the spufi is because of space requirements , the query has resulted in so many rows that the spufi. An attempt to the application program that uses a DBRM or a package. The location-name, collection-id, dbrm-name, consistency-token are not found.
The resource is unavailable for the execution of SQL code. The current transaction has been rolled out because of deadlock or time out. Execution is unsuccessful due to deadlock or timeout. Need to rephrase the query. Row was not found for a fetch. When will you use it? But allows the NULL values in the column. DB2 generates the default value. For example every product should have product name, every employee should have employee name. Are view updateable?
Top DB2 Interview Questions And Answers
When is it used? How is a typical DB2 batch program executed?What Is A Data Page? The form in which data is retrieved depends on the way the table is defined inside the database. This statement is incorrect. It has not physical existence. At pre-compile time, the table or view descriptions are then used to check the validity of SQL statements. How can you validate Sql errors during cursor operation in db2 pgms and where do you code?