query-optimization

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MySQL: Optimizing COUNT(*) and GROUP BY

I have a simple MyISAM table resembling the following (trimmed for readability -- in reality, there are more columns, all of which are constant width and some of which are nullable):[详细]

2023-03-20 05:17 分类：问答
Mysql Query Optimization, Remove a 'NOT IN (SELECT CLAUSE)' using joins

I have 2 tables, called login_log, logs the timestamp of each email that 开发者_开发知识库logs into a website.The other table is called admin and contains administration rights.Both have the email as[详细]

2023-03-19 19:51 分类：问答
Performing "Optimized" set Operations on java.util.ArrayList or in SQL

This is the first time I need to ask question to get my query solved before today previous threads were able to solve my queries.[详细]

2023-03-19 19:50 分类：问答
MySQL Index Optimization

I\'m struggling with MySQL index optimization for some queries that should be simple but are taking forever. Rather than post the specific problem, I wanted to ask if there is an automated way of deal[详细]

2023-03-19 13:22 分类：问答
MySQL performance using where

A simple query like the one below, properly indexed on a table populated with roughly 2M rows is taking 95 rows in set (2.06 sec) a lot longer to complete than I was hoping for.[详细]

2023-03-19 07:44 分类：问答
Struggling to optimize N+1 query in Hibernate

I’m struggling to improve a n+1 query on a project I’m working on. I use Hibernate with the model shown below, and I want to express a query to retrieve all items related t开发者_如何转开发o a portf[详细]

2023-03-19 07:00 分类：问答
Speeding up a complicated multi-joins MySQL query (created via CakePHP if that matters)

I have a MySQL query below that I\'m using to get events for my event listings page.The problem is, it\'s taking ~35 seconds to run with the limit 10, and another ~35 seconds to do the COUNT for pagin[详细]

2023-03-19 05:37 分类：问答
Optimising slow SQL query

I am having problem with changing SQL query to preform faster. I need to retrieve the first and th开发者_Go百科e last row for specific time interval. For example I am looking for first and last date t[详细]

2023-03-18 21:39 分类：问答
Complex Query Optimization

Running Postres 7.4 (yep upgrading)开发者_StackOverflow中文版 This is a view query and it\'s used a lot but takes longer than I would like. Any Optimization Suggestions? Any field with a Id in the na[详细]

2023-03-18 20:29 分类：问答
SQL Query Optimisation (Direction of Condition Evaluation)

Let\'s say I have a dictionary of 26000 words, 1000 words per letter of the alphabet. If I want to find all the words that have an \'e\' in them, I write:[详细]

2023-03-18 17:25 分类：问答