A Comprehensive Overview of DB2 Catalog Table Schemas

Catalog tables in DB2 are system tables that are automatically created during the database creation process. There is no need to create them explicitly.

Table of contents

DB2 Catalog Tables

Tables
Indexes
Views
Security information
Tables update information
Statistics

Catalog Table Schemas

The tables under the SYSIBM schema are master tables. The tables under SYSCAT are views of SYSIBM.

SYSIBM
SYSCAT
SYSFUN
SYSPROC
SYSSTAT

DB2 Catalog Table Interview Questions

01. Which is the schema used for user-defined functions?

SYSFUN

02. What is the schema used for stored procedures?

SYSPROC

03. The views created under SYSSTAT are user editable?

Yes. These are editable.

04. Which command do you need to use to know tables defined under a schema?

LIST TABLES FOR SCHEMA schema-name

Database Object	SYSCAT System Catalog View
Table	TABLES
View	VIEWS
Index	INDEXES
Data type	DATATYPES
Column	COLUMNS
Table space	TABLESPACES
Buffer pool	BUFFERPOOLS
Package	PACKAGES
Constraints	CHECKS
Referential integrity	REFERENCES
Partition groups	NODEGROUPS
Partition group definitions	NODEGROUPDEF
XML values index	INDEXXMLPATTERNS
Stored procedures	PROCEDURES
Sequences	SEQUENCES
Event Monitors	EVENTMONITORS

Conclusion

The DB2 catalog tables play a crucial role in the database creation process. These system tables are automatically created, eliminating the need for explicit creation. The catalog tables provide important information about various database objects such as tables, indexes, views, security information, and statistics.

The catalog tables are organized under different schemas, with SYSIBM containing the master tables and SYSCAT serving as views of SYSIBM. Additionally, there are schemas like SYSFUN and SYSPROC for user-defined functions and stored procedures, respectively.

When it comes to managing the catalog tables, there are a few interview questions that may arise. For example, the schema used for user-defined functions is SYSFUN, while SYSPROC is used for stored procedures. It’s also worth noting that the views created under SYSSTAT are editable.

To retrieve information about tables defined under a specific schema, the command “LIST TABLES FOR SCHEMA schema-name” can be used.

In conclusion, understanding the DB2 catalog tables is essential for effectively managing and retrieving information about the database objects. They serve as a valuable resource for database administrators and developers alike.

References

Srini

Data Engineer with deep AI and Generative AI expertise, crafting high-performance data pipelines in PySpark, Databricks, and SQL. Skilled in Python, AWS, and Linux—building scalable, cloud-native solutions for smart applications.