DB2 ARCHITECTURE | Db2 Architecture and Process Overview

Описание: DB2 ARCHITECTURE | Db2 Architecture and Process Overview


IBM Db2 (Database 2) is a relational database management system (RDBMS) that is often used on mainframe systems. The architecture of Db2 on a mainframe is designed to provide a robust, high-performance, and scalable database solution. Here are key components and aspects of the mainframe Db2 architecture:

Buffer Pools:

Db2 uses buffer pools to cache frequently accessed data in memory, reducing the need to retrieve data from disk for every query.
The buffer pools are divided into different page sets, and each page set contains a number of pages that are read or written as a unit.
Table Spaces:

Data in Db2 is stored in table spaces, which are logical storage units that map to physical storage on disk.
Different types of table spaces exist, such as regular table spaces for user data, index table spaces for index structures, and large object (LOB) table spaces for storing large data objects.
Indexes:

Db2 uses indexes to speed up data retrieval by providing a quick lookup mechanism. Indexes are stored in separate index table spaces.
Indexes can be created on one or more columns of a table to improve the performance of SELECT, UPDATE, DELETE, and MERGE operations.
Buffer Pool Management:

Db2's buffer pool management involves the allocation and deallocation of memory for buffer pools based on the system's needs.
Buffer pool configurations are specified in the database configuration, and the database manager dynamically adjusts buffer pool sizes based on workload demands.
Locking and Concurrency Control:

Db2 uses a locking mechanism to ensure data integrity and consistency in a multi-user environment.
Different types of locks, such as shared and exclusive locks, are used to control access to data. Db2 employs various isolation levels to manage concurrency.
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