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Results tagged with performance-tuning
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user 249314
Improving the performance characteristics of a database application or system.
3
votes
2
answers
500
views
Merge join asks for seemingly unnecessary sort before joining
I use one table to update another table. Both the tables have a clustered index where the first 4 columns are the same type of data.
CREATE UNIQUE CLUSTERED INDEX [i109139_I_109139CLI_44C9176D64C84ECB …
- 86.5k
3
votes
1
answer
271
views
SQL server chooses hash match over merge join but the input fields to join should be sorted
I have a simple query that joins two tables on the field PRODID. For some reason, SQL Server opts to use a hash match to join this, but I believe it should choose a merge join, as that field is part o …
