COMP 266 Lecture Notes - Lecture 7: Database Server, Temporary File, Scalability
1 Jul 2018
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Question: The UBS broker company has a
database server with ...
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The potential reasons for the performance can be:
1. The response time provided by the server to accounting and stock exchange
applications might be increased due to same disk usage, i.e. more reads than writes with
small I/O size.
2.Intensive bandwidth usage may occur due to which the performance may get degraded.
3.It can be insufficient number of drives to service I/O’s.
4.Poor Indexing schemes.
5.Database structure might not well normalized.
6.Scalability problems occurring due to access patterns.
Methods for reducing I/O contention:
1.Use multiple disks to store files.
2.Seperate read-only data from writable data
3.Table Placement.
Place each table on different disk drives so that queries which access multiple tables will
not create I/O contention on one disk.
4.Index Placement.
One should not place indexes on the same disk drive as other information that will likely
be accessed by a query that uses the index.
5.Temporary File Placement.
temporary files must be placed on other disk which is not used for storing data and
indexes.
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Document Summary
Question: the ubs broker company has a database server with The potential reasons for the performance can be: the response time provided by the server to accounting and stock exchange applications might be increased due to same disk usage, i. e. more reads than writes with small i/o size. 2. intensive bandwidth usage may occur due to which the performance may get degraded. 3. it can be insufficient number of drives to service i/o s. Place each table on different disk drives so that queries which access multiple tables will not create i/o contention on one disk. One should not place indexes on the same disk drive as other information that will likely be accessed by a query that uses the index.
