NonStop Systems Introduction

NonStop Server Architecture
NonStop Systems Introduction—527825-001
7-14
Easy Expansion of Data
•
Records for authors Q-Z reside on the third branch system.
Each of the three branches of the catalog department is responsible for maintaining the
range of records in its local partition and needs to go across the network only when it
needs to check records in another partition. The end result of the partitioned database
is improved response time for all users and higher total system throughput of record
updates on all three systems.
Figure 7-9 on page 7-14 shows the three partitions of the database. For the sake of
simplicity, only the author field of each record is shown. Note that each partition can
have a different system name and volume name, but all the partitions must have the
same subvolume name (PART in the figure) and file identifier (PARTFILE in the figure).
A subvolume is a logical division of a disk volume. It contains one or more files.
Figure 7-9. A Database Partitioned Across Three Network Nodes
\SYSA.$VOL1 \SYSB.$VOL2 \SYSC.$VOL3
PART.PARTFILE
ALLEN
BAKER
DAVIS
EDWARDS
GOMEZ
PART.PARTFILE
HAN
KELLEY
LOTHAR
NYQUIST
PARIS
PART.PARTFILE
QUINCY
ROX
VARIO
WEST
ZIP
VST098.vsd