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PERFORMANCE DURING TABLE ACCESS:
Advantages and disadvantages of the method of buffer synchronization:
Ÿ
Advantage:
The load on the network is kept to a minimum. If the buffers were to be synchronized immediately after each modification, each server would have to inform all other servers about each modification to a buffered table via the network. This would have a negative effect on the performance.
ŸDisadvantage :
The local buffers of the application servers can contain obsolete data between the
moments of synchronization.
This means that:
Ÿ
Only those tables which are written very infrequently (read mostly) or for which such temporary inconsistencies are of no importance may be buffered.
Ÿ Tables whose entries change frequently should not be buffered. Otherwise there would be a constant invalidation and reload, which would have a negative effect on the performance.
Advantages and disadvantages of the method of buffer synchronization:
Ÿ
Advantage:
The load on the network is kept to a minimum. If the buffers were to be synchronized immediately after each modification, each server would have to inform all other servers about each modification to a buffered table via the network. This would have a negative effect on the performance.
ŸDisadvantage :
The local buffers of the application servers can contain obsolete data between the
moments of synchronization.
This means that:
Ÿ
Only those tables which are written very infrequently (read mostly) or for which such temporary inconsistencies are of no importance may be buffered.
Ÿ Tables whose entries change frequently should not be buffered. Otherwise there would be a constant invalidation and reload, which would have a negative effect on the performance.
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