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Essay's paper info
| Topic: |
Technology
|
| Number of pages / Number of words: |
11 / 2887 |
Essay's paper body
If yes, then it proceeds further.
The optimizer then looks if the where clause contains
any SARG. If there is a valid SARG, the optimizer then looks for the distribution statistics of the index as:
select distribution from sysindexes
where id = object_id('Authors')
If there are no statistics for the index, the optimizer defaults to a fixed percentage of rows depending upon the operator in the where clause:
Equality 10%
Closed Interval 25%
Open Interval 33%
The index distribution statistics will not be used when the
optimizer does not know the value of the RHS in a where clause as in the following:
where Price = 2000*12,
where author_id = @au_id
where author_id in (select author_id from...
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If there is a valid SARG, the optimizer then looks for the distribution statistics of the index as:
select distribution from sysindexes
where id = object_id('Authors')
If there are no statistics for the index, the optimizer defaults to a fixed percentage of rows depending upon the operator in the where clause:
Equality 10%
Closed Interval 25%
Open Interval 33%
The index distribution statistics will not be used when the
optimizer does not know the value of the RHS in a where clause as in the following:
where Price = 2000*12,
where author_id = @au_id
where author_id in (select author_id from...
Essay fragment
General points of the essay
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