Usually, a single database partition exists on each physical node and the Partitions, some of its rows are stored in one partition and others are stored When a table is in a nodegroup consisting of multiple Tables can be located in one or more database In this case nodegroups, while present, provide noĪ partitioned database is a database with two or more database All data in the database is stored in that (Node was the term used in the DB2 Parallel Edition for AIXĪ single-partition database is a database having only oneĭatabase partition. Logs.) A database partition is sometimes called a node or database Startedfor an overview of indexes, configuration files, and transaction That consists of its own data, indexes, configuration files, and transaction A database partition is a part of a database Relationship Among Some Database ObjectsĭB2 extends the database manager to the parallel, multi-nodeĮnvironment. ItĪlso illustrates that tables, indexes, and long data are stored in tableįigure 1. Request (a SELECT statement) from a database.įigure 1 illustrates the relationship among the objects just described. In this chapter we use the term "query" to identify a retrieval The query uses Structured Query Language (SQL) to create a All database and table data is assigned toĪ query is used in applications or by users to retrieve data from aĭatabase. Table data isĪccessed via SQL, a standardized language for defining and manipulating data Mathematical principles and operations called relations. Data can be viewed and manipulated based on The data in the table is logically related, and relationships canīe defined between tables. Table spaces reside in nodegroups.Ī table consists of data logically arranged in columns and A container is an allocation of physical storage Once a table space is created, you can then create Table space's definition and attributes are recorded in the database See "Overview of DB2 Parallelism Concepts" for the definition of a database partition.Ī database is organized into parts called table spaces. See "Nodegroups and Data Partitioning" for more information about nodegroups. Nodegroup where the table spaces will be stored, then you create the table When you want to create tables for the database, you first create the It also has separate security from otherĪ nodegroup is a set of one or more database partitions. (which other instances cannot access), and all its database partitions share It contains all the database partitions definedįor a given parallel database system. It controls what can be done to the data,Īnd manages system resources assigned to it. Which chapters are appropriate for your business needs and yourĪ database manager (sometimes called an instance) isĭB2 code that manages data. After reading this chapter, you should be able to discern In someĬases, entire sections or chapters are appropriate for only a specificĮnvironment. These considerations and tasks are presented toward the end of each section orĬhapter and introduced as being for a specific environment. With the different levels ofĬomplexity in database environments that DB2 supports, there areĬonsiderations and tasks specific to one or more of these environments. The remaining chapters in this part of the book assist you in the designĪnd implementation of your database. It allows you to choose how to best match your hardwareĪnd application requirements with a specific DB2 product configuration. Summary of parallelism possible for each hardware environmentĭB2 provides the flexibility for you to run a wide range of hardwareĬonfigurations.Overview of basic DB2 concepts and DB2 parallelism concepts.This chapter provides an introduction to DB2 Universalĭatabase and to the types of parallelism provided by DB2. Introduction to Parallelism in DB2 Universal Database
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