Requirements for VLDB Support in Objectivity/DB
[ draft ]

Jamie Shiers

CERN/IT/ASD

 

http://wwwinfo.cern.ch/asd/cernlib/rd45/index.html

VLDB Requirements

Basic Assumptions:

 

Scalability: LHC Data Volumes

Objectivity/DB Scalability

Theoretical limitations of Objy

 

Total bytes = 216 db/fd x 215 c/db x 216 pg/c x 216 bytes/pg

 

or 1019 bytes (10,000 PB!!!)

 

fd = Federation

db = Database

c = Container

pg = Page

Practical Limitations of Objy

What Would We Like?

 

# Slots / page

DB Page Size

Container Size

 

# Containers / DB

OID Changes

Container - File Mapping

 

 

Conclusions