So I\'m (still) going through some slow legacy sql views used to do calculate some averages and standarddeviations on a (sometimes) large set of data. What I end up with are views joining views joinin
In one of my queries there\'s an inse开发者_JAVA百科rt of data into a temp table. Looking at the query plan, it shows the the actual insert into temp table took 54% (just inserting data into temp tabl
My applications runs queries against a sql server database. In many cases I can see the benefit of an execution plan: for example I click for the first time on a buttonto
I know I can change the way MySQL executes a query by using the FORCE INDEX (abc) keyword. But is there a way to change the execution order?
Trying to generate an explain plan in SQL Developer, the program puts up a message box 开发者_StackOverflow社区with title \"failed to query plan_table\" complaining \"invalid column name\". The plan i
I\'m trying to optimise a PostgreSQL 8.4 query. After greatly simplifying the original query, trying to figure out what\'s making it choose a bad query plan, I got to the point where runni开发者_Pytho
If you have an inefficient query, and you add an index to help out performance, should the query \"instantly\" start using th开发者_开发百科e index?
i ran the explain command on my main table in mysql.it showed like idselect_typetabletypepossible_keyskeykey_lenrefrowsExtra
I\'m not sure sure how to interpret this, but all the queries I run in sql server 2005 have a \"query co开发者_Python百科st (relative to batch)\" of 100%. Is there any way to reduce the cost?If your b
I have a question addressed to sql guru. There are two tables with almost identical structure. Based on parameter passed into the stored procedure I need to collect data from one or another table.
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