What is page size in Db2?
By default, the default page size is 4096. The default can be set to one of the other possible values when the databases is created using the PAGESIZE clause of the CREATE DATABASE statement. The possible values for page size in a db2 database, no mater where it is referenced are: 4K or 4,096 bytes. 8K or 8,192 bytes.
What is Getpage?
GETPAGE represents a number in the Db2 accounting record that is fairly constant over time for the same transaction. It shows the number of times Db2 requested a page from the buffer manager. Each time Db2 has to read or write data in a page, the page must be available, and at least one GETPAGE is counted for the page.
What are the mandatory components of Db2?
The complex DB2 internal structure has been divided into 5 major components / Address Spaces:
- System Services component / System Services Address Space (Job: DSN1MSTR)
- Locking Services component/ Locking Services Address Space (Job: IRLMPROC)
- Database Services component/ Database Services Address Space (DSN1DBM1)
What are pages in Db2?
Pages are the unit of management within a buffer pool. The unit of I/O is one or more pages chained together. Db2 makes a getpage request operation whenever there is a need to access data in a page, either in an index or a table, such as when executing an SQL statement.
What is vtam in DB2?
Virtual Telecommunications Access Method (VTAM®) is a program that you can use to control remote Db2 communication.
What is Irlm in DB2?
The DB2® internal resource lock manager (IRLM) is both a separate subsystem and an integral component of DB2. IRLM works with DB2 to control access to your data. IRLM is shipped with DB2, and each DB2 subsystem must have its own instance of IRLM.
What is Page in Db2?
What is DDF in Db2?
The distributed data facility (DDF) allows client applications that run in an environment that supports DRDA to access data at Db2 servers. In addition, a Db2 application can access data at other Db2 servers and at remote relational database systems that support DRDA.
What is Db2 DDF?
What is thread in Db2?
Threads are an important resource within a Db2 subsystem. A thread is a structure that describes a connection made by an application and traces its progress in the Db2 subsystem. These values are specified at installation, and controlled by subsystem parameters.
What is DB2 DRDA?
DRDA stands for Distributed Relational Database Architecture. It is an architecture, developed by IBM, that enables relational data to be distributed among multiple platforms. Both like and unlike platforms can communicate with one another. For example, one DB2 subsystem can communicate to another DB2 subsystem (like).
What is thread in DB2?
What is DDF in DB2?
What is db2top?
What is db2top? db2top is a “real-time” tool for seeing what is currently going on within a db2top instance or database. I put real-time in quotes, because technically it is a couple of seconds (depending on how you invoke it) behind real time, and it can also be used in a number of ways.
What does DRDA stand for?
Scheme through which the Central share of fund is directly released to the District Rural Development Agency (DRDA). The DRDA is the principal organ at the district level to manage and oversee the implementation of different anti-poverty programmes of the Ministry of Rural Development.
What is DRDA in mainframe?
Distributed Relational Database Architecture™ (DRDA) is a set of protocols that enable communication between applications and database systems on disparate platforms, and enables relational data to be distributed among multiple platforms.
What is hadr in DB2?
The DB2® Data Server High Availability Disaster Recovery (HADR) feature is a database replication feature that provides a high availability solution for both partial and complete site failures.
What is DB2 top?
The db2top tool is a monitoring tool that comes packaged with every copy of DB2 for Linux and Unix as of version 9.1 FP6, version 9.5 FP2, and version 9.7 (Linux Power PC as of version 9.7 FP3). If you have any one of these versions of DB2, there is nothing you need to download to get access to db2top.
What is DRDA in DB2?
What is the function of DRDA?
Thus the role of the DRDA is in terms of planning for effective implementation of anti-poverty programmes; coordinating with other agencies- Governmental, non-Governmental, technical and financial for successful programme implementation; enabling the community and the rural poor to participate in the decision making …
What is the use of Count in DB2?
Introduction to Db2 COUNT () function The Db2 COUNT () function is an aggregate function that returns the number of values in a set or the number of rows in a table. The following is the syntax of the COUNT () function: COUNT (ALL | DISTINCT expression)
How to get the number of books with ISBN in DB2?
2) Using DB2 COUNT () function with the GROUP BY clause example The COUNT () function is often used with the GROUP BY clause to return the number of values for each group. This statement uses the COUNT (expression) returns the number of books with ISBN for each publisher:
Does DB2 support subtotals by name plus total?
What is your platform of Db2? If you want the subtotals by name plus the total, SQL didn’t originally support that. You had to union the two results. However more modern versions have added ROLLUP (and CUBE) functionality…
What is the difference between count and count_big in SQL?
If the number of values in a set exceeds the maximum value of the INT type, which is 2,147,483,647, you can use the COUNT_BIG () function instead. The COUNT_BIG () behaves the same as the COUNT () function except for the type of return value that supports a larger range, i.e., BIGINT.