I understand that query plans for parametrized queries are cached, but at what level?If I drop my connection does that drop the query pla开发者_开发问答n?If I used a different command object does that
I used to develop databases under ms-sql, and now I\'ve moved to mysql. Great progress. The problem is that I don\'t have any tool to see graphically the query execution plan...
Does the ANALYZE command have any downsides (except a开发者_运维问答 slighty larger db)? If not, why is not executed by default?There is another downside. The ANALYZE results may cause the query plann
In Microsoft SQL Server how can I get a query execution plan for a query开发者_高级运维 / stored procedure?There are a number of methods of obtaining an execution plan, which one to use will depend on
I need to parse execution plans for queries and extract data out of them for my application. While this answer JDBC Oracle - Fetch explain plan for query helped me fetch a text execution plan through
This question already has answers here: Closed 11 years ago. Possible Duplicate: How does SQL server work out the 开发者_运维问答estimated number of rows?
Context: SQL Server 2008. There are 2 tables to inner join. The fact table, which has 40 million rows, contains the patient key and the medications administered and other facts. There is a unique inde
In my SELECT statement i use optional parameters in a way like this: DECLARE @p1 INT = 1 DECLARE @p2 INT = 1
I have a query that really isn\'t that complicated. Its taking close to 250ms to run, which is pretty slow. I\'ve analyzed the query using EXPLAIN and noticed a seq scan. I have the proper indexes in
I am trying to increase one of my request performance. My request is made of 10 different select . The actual production query is taking 36sec to execute.
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