For questions about making database queries run faster.
Is there any way to cache a cache sql query result without using rdd.cache()? for examples: output = sqlContext.sql("…
caching query-optimization apache-sparkI have a huge table, having a much smaller number (by orders of magnitude) of distinct values on some column …
sql sql-server-2005 tsql indexing query-optimizationI have a SQL server 2012 table with 2697 Records and the table is not indexed. The data will get increased in …
sql-server performance query-optimizationI am trying to answer the following question as part of my college revision: Create an index on at least …
mysql sql database query-optimizationi have a table called orders. one column on order is customer_id i have a table called customers with 10 …
sql database database-design query-optimizationIn output of explain command I found two terms 'Seq Scan' and 'Bitmap heap Scan'. Can somebody tell me what …
optimization postgresql query-optimization sql-execution-planI have a table, let's call it "foos", with almost 6 million records in it. I am running the following query: …
sql postgresql query-optimization sql-order-by limitHow can I compare two queries X and Y and say that X is better than Y, when they both …
sql-server query-optimizationHaving this table: CREATE TABLE `example` ( `id` int(11) unsigned NOT NULL auto_increment, `keywords` varchar(200) NOT NULL, PRIMARY KEY (`id`) ) …
mysql sql indexing query-optimizationTo quote the docs: When creating an index, the number associated with a key specifies the direction of the index, …
mongodb performance sorting indexing query-optimization