- Database service address space / ReadIN-writeIN / Physical component
- Database services which is responsible for managing Physical structure of DB.
- Handles SQL related queries
- Core logic of DB2
- Update SYSLGRNX/Interaction with coupling facility
Buffer Spool management
Relational Data system (RDS)- Data Manager (DM)
- Buffer Manager (BM)
Relational Data System
o
SQL Compiler (compiles all SQL)
o
Runtime Executor
o
Catalog services
o
Manages Objects
Data Manager
o
DB2 Engine
o
Makes requests to get/create/alter data
o
Invokes buffer manager
o
Interface with IRLM
Buffer Manager
o
Access Physical data for data manager / Index
Manager
o
Searches for page in Buffer spool , if there is
no page then VSAM media manager to return from DASD
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