Table of Contents
What is a catalog view?
Catalog views return information that is used by the SQL Server Database Engine. We recommend that you use catalog views because they are the most general interface to the catalog metadata and provide the most efficient way to obtain, transform, and present customized forms of this information.
What is catalog information in Db2?
Db2 maintains a set of tables that contain information about the data that Db2 controls. These tables are collectively known as the catalog . The catalog tables contain information about Db2 objects such as tables, views, and indexes.
What is a system catalog in database?
The system catalog consists of tables and views that describe the structure of the database. Sometimes called the data dictionary, these table objects contain everything that the database knows about itself. Each system catalog table contains information about specific elements in the database.
What are the contents of system catalog?
The system catalog consists of tables describing the structure of objects such as databases, base tables, views, and indices. (These tables are called system base tables.) The Database Engine frequently accesses the system catalog for information that is essential for the system to function properly.
What is the purpose of system catalog?
A system catalog is extremely important to database admins or all other database users who wish to understand the nature and structure of a database. The system catalog lets order to be kept, not just by the users and database administrator, but also by the database server as well.
What is Db2 schema?
A schema is a collection of named objects. The first part of a schema name is the qualifier. A schema provides a logical classification of objects in the database. The objects that a schema can contain include tables, indexes, table spaces, distinct types, functions, stored procedures, and triggers.
How do I access system catalogue?
Normal user access to the system catalog is read-only. Users with Connect or Resource privileges cannot alter the catalog, but they can access data in the system catalog tables on a read-only basis using standard SELECT statements.
What is catalog in SQL database?
What is node name in DB2?
The DB2® client uses the communication end point information in the node directory whenever a database connection or instance attachment is requested. The database manager creates a node entry and adds it to the node directory each time it processes a CATALOG… NODE command.
What is difference between data dictionary and system catalog?
Usually, system catalogs are accessed by the DBMS to perform various transactions and data dictionary has the user accessible views that are accessed by the developers/ designers/ users. It is a database about the database objects. It can exist in the same database or it can be completely a separate database.
What is view DB2?
A view is an alternative way of representing data that exists in one or more tables. A view can include all or some of the columns from one or more base tables.
What are the views contained in a DB2® for I catalog?
The views contained in a Db2® for i catalog are described in this section. The database manager maintains a set of tables containing information about the data in each relational database.
Does IBM i support Db2?
IBM® i catalog tables and views The IBM i catalog tables and views are modeled after the ANS and ISO catalog views, but are not identical to the ANS and ISO catalog views. These tables and views are compatible with prior releases of Db2 for i. These tables and views exist in schemas QSYS and QSYS2.
What is included in the IBM i catalog?
The IBM i catalog includes the views and tables in the QSYS2 schema displayed in this section. The catalog includes the views and tables in the SYSIBM library displayed in this section. There are two versions of some of the ANS and ISO catalog views. The version documented is the normal set of ANS and ISO views.
What are catalog tables and views?
The catalog tables and views contain information about all tables, parameters, procedures, functions, distinct types, packages, XSR objects, views, indexes, aliases, sequences, variables, triggers, and constraints in the entire relational database.