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How long does MySQL optimize take?
Optimizing table straight away takes over 3 hours, while dropping indexes besides primary key, optimizing table and adding them back takes about 10 minutes, which is close than 20x speed difference and more compact index in the end.
How can I speed up MySQL query execution?
Tips to Improve MySQL Query Performance
- Optimize Your Database. You need to know how to design schemas to support efficient queries.
- Optimize Joins. Reduce the join statements in queries.
- Index All Columns Used in ‘where’, ‘order by’, and ‘group by’ Clauses. INDEXES.
- Use Full-Text Searches.
- MySQL Query Caching.
How long should a MySQL query take?
A query can take up to one hour if it crunches extremely large amount of data once every 6 months in a system where only it is running. It won’t be a problem. Another query can take 100ms only but it’s on a web server and 1000 persons are connecting simultaneously!
Should I optimize MySQL table?
If your application is performing lot of deletes and updates on MySQL database, then there is a high possibility that your MySQL data files are fragmented. This will result in lot of unused space, and also might affect performance. So, it is highly recommended that you defrag your MySQL tables on an ongoing basis.
What does MySQL optimize do?
OPTIMIZE TABLE reorganizes the physical storage of table data and associated index data, to reduce storage space and improve I/O efficiency when accessing the table. The exact changes made to each table depend on the storage engine used by that table.
What is MySQL performance tuning?
Software MySQL Performance Tuning. SQL performance tuning is the process of maximizing query speeds on a relational database. The task usually involves multiple tools and techniques. Tweaking the MySQL configuration files. Writing more efficient database queries.
Why is MySQL slow?
What is it? If your database is being used in high volumes, this can slow the database down. When there are too many queries to process at once, the CPU will bottleneck, resulting in a slow database.
Why is MySQL query taking so long?
There are a number of things that may cause a query to take longer time to execute: Table lock – The table is locked, by global lock or explicit table lock when the query is trying to access it. Deadlock – A query is waiting to access the same rows that are locked by another query.
How often should I optimize MySQL?
Published Feb 7, 2010 by Baron Schwartz in Databases Many times I’ve heard people advise on “best practices” for a MySQL database. This often includes routine maintenance, such as “you should run OPTIMIZE TABLE on all of your InnoDB tables once a week to defragment them for better performance.”
When should you run optimize tables?
Use OPTIMIZE TABLE in these cases, depending on the type of table: After doing substantial insert, update, or delete operations on an InnoDB table that has its own . ibd file because it was created with the innodb_file_per_table option enabled.