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WHERE column IS NULL and index usage...
dmann — Thu, 07/22/2010 - 14:53
I have a customer with a million row 125mb table. A query they are running returns very slowly:
explain plan for SELECT * FROM BIGTABLE WHERE col1 IS NULL;
SELECT * FROM TABLE(dbms_xplan.display);
--------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost |
--------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 96 | 1436 |
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