NEC Storage Manager IS015-9E ユーザーズマニュアル
Chapter 1 Data Replication Overview
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By creating replication volumes of the master database, you can separate the database and carry out
update tasks and search tasks using different volumes. This allows you to carry out database update
tasks without affecting database search tasks.
Figure 1-5 Parallel Processing of Search Task
The procedure for parallel processing of search operation is described below.
(1)
In the nighttime, suspend search tasks and connect the master volume (MV) and replication
volume (RV).
(2)
In the daytime, separate the master volume (MV) and replication volume (RV). Then perform
update tasks and search tasks in parallel (RV contains data for the prior day).
Master
Database
Database
Reflection of
Updated Parts
Updated Parts
Master
Database
Database
Daytime
Data for Previous
Day
Day
Nighttime
Update Task
Replication
(RV)
Separate
Search Task
Master
(MV)
Replication
(RV)
Connect
Master
(MV)