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many selects on one table - performance issue

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  #1  
Old September 12th, 2005, 06:34 AM
egidy egidy is offline
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many selects on one table - performance issue
I have one table (for parameters of all system) which is very rarely updated (if at all) but select's are issued very frequently and from different places (exe, triggers, SP etc.) - can this lead to bad performance and should I try to avoid this kind of solution?

I have heard about locks - maybe they are working in this case?

Thanks for your thoughts in advance.
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Old September 12th, 2005, 11:47 AM
snf173 snf173 is offline
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Quote:
Originally Posted by egidy
I have one table (for parameters of all system) which is very rarely updated (if at all) but select's are issued very frequently and from different places (exe, triggers, SP etc.) - can this lead to bad performance and should I try to avoid this kind of solution?

I have heard about locks - maybe they are working in this case?

Thanks for your thoughts in advance.


Hi,

In Firebird, readers don't block writers and vice versa. Multiple read opearations on the same table will not result in table locking in Firebird. See the factsheet for this (http://firebird.sourceforge.net/guide/FBFactsheet.html).

Regards,
Luciën Ceder
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Old September 13th, 2005, 02:28 AM
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SilverDB SilverDB is offline
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Also to improve select performance use indexes on ordering fields and so on ...
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Old September 13th, 2005, 03:24 AM
fikret fikret is offline
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Quote:
Originally Posted by egidy
I have one table (for parameters of all system) which is very rarely updated (if at all) but select's are issued very frequently and from different places (exe, triggers, SP etc.) - can this lead to bad performance and should I try to avoid this kind of solution?


NO, it won't lead to bad performance. But your indexes can.

Quote:
Originally Posted by egidy
I have heard about locks - maybe they are working in this case?


Firebird's MGA (Multigeneration architecture) doesn't use locks at all. But, you can explicitly use locks.

Quote:
Originally Posted by egidy
Thanks for your thoughts in advance.


No problem ;-)

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Fikret Hasovic http://fikret.fbtalk.net

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Old September 13th, 2005, 01:09 PM
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mariuz mariuz is offline
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if you want to know more about Multi Version Concurrency Control , Roman Rokytskyy wrote
an paper about it

http://www.firebirdsql.org/doc/whit...m_vs_oracle.htm
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