DB2 - Storage Model

1. SECTION – 3
DB2 ARCHITECTURE
DB2 Storage ModelLecture 7

2. Contents
2
 DB2 Storage Model
 Tablespaces - Characteristics
 Directory Hierarchy – OS File System
 Required Tablespaces
 Summary

3. DB2 Storage Model
3
To understand the DB2 storage model, we need to understand
the
following architecture:
Database - MyDB Tablespace - tb2 Container – C3
tb1
tb3
tb2
tb4
C1
C3
.. .. ..
.. .. Pn
P1 P2 P3 P4 P5
P6
Instance – DB2
C2

4. DB2 Tablespaces : Characteristics
4
 Tablespaces are logical objects between the logical
tables and physical container
 All tables, indexes, and other data are stored in a table
space
 A tablespace is made up of containers
 Containers are made up of pages
 Page is the lowest unit of storage in DB2
 Page sizes are in denominations of
 4K, 8K, 16K and 32K

5. Directory Hierarchy – OS File
System5

6. Required Tablespaces in DB2
6
Each database must have a minimal set of table
spaces that are used for storing system, user and
temporary data:
1) SYSCATSPACE (0) : contains the metadata
2) TEMPSPACE (1) : system temporary tablespace
used for storing intermediate results of SQL
operations
3) USERSPACE1 (2) : used to store user created

7. Summary
7
Let’s summarize this lecture :
 Databases are made up of tablespaces
 Tablespaces are the logical layer b/w logical tables
and physical containers
 Tablespaces are made up of containers
 Containers are made up of pages (4/8/16/32 k)
 OS file system directories for DB2
 3 tablespaces required at a minimum

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9. Thank You !