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How to get query to use index instead of table?
How can I get it to use the index instead of the table? Your query has to use the table and not the index alone because you have two columns ( is_live and sub_id) in the WHERE clause that are not part of this ( created) index.
Why is Oracle SQL query not using an index?
Answer: Oracle SQL not using an index is a common complaint, and it’s often because the optimizer thinks that a full-scan is cheaper than index access. Oracle not using an index can be due to: · Bad/incomplete statistics – Make sure to re-analyze the table and index with dbms_stats to ensure that the optimizer has good metadata.
How to log queries that do not use indexes?
Whether queries that do not use indexes are logged to the slow query log. See Section 5.2.4, In addition to a1ex07’s answer you can use the shell command mk-query-digest to output a report of your running queries without using the log.
When to use an index instead of a where clause?
Therefore I’m using a pure SQL approach that (currently) works with all the DBs that cross my way. The idea is just to make it impossible for the DB to use the specific index by obfuscating the respective expression in the SQL. E.g. when a where clause makes the database believe it’s best resolved using an index, but it isn’t.
Why is MySQL Query Not using the created index?
I have this query (below) which keeps hitting the table when it should be using the created index. Is there something simple I’m missing here? How can I get it to use the index instead of the table?
Why is query does not use index-Ask Tom-Oracle?
I have a table that has 6 million rows. And I’m trying to extract some rows and Oracle optmizer are not using the index existent in column. Using a filter by a not indexed column, the number of rows have an expressive reduction but the cost doesn’t.
Can you use a filter by a not indexed column?
Using a filter by a not indexed column, the number of rows have an expressive reduction but the cost doesn’t. So, I decided to create a index ID_FILIAL column. Extracting query again… Could anyone tell me why ? Thanks. and we said… There are many reasons why this may be the case. But first:
Why is this query not using my nonclustered index?
The first query uses the clustered index, the second query uses my non-clustered index. My question is two parts: Why, since both queries have a WHERE clause on the [DateEntered] field, does the server use the clustered index on the first, but not the second?