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What is analyzed table in MySQL?
MySQL uses the stored key distribution to decide the table join order for joins on something other than a constant. ... In particular, if the innodb_stats_persistent system variable is enabled, you must run ANALYZE TABLE after loading substantial data into an InnoDB table, or creating a new index for one.
What is explained in MySQL?
The EXPLAIN keyword is used throughout various SQL databases and provides information about how your SQL database executes a query. In MySQL, EXPLAIN can be used in front of a query beginning with SELECT, INSERT, DELETE, REPLACE, and UPDATE.
What is Key_len in MySQL explain?
According to MySQL website, the key_len column indicates the length of the key that MySQL decided to use. The length is NULL if the key column says NULL. Note that the value of key_len enables you to determine how many parts of a multiple-part key MySQL actually uses.
What is described in MySQL?
In MySQL, the DESCRIBE and EXPLAIN statements are synonyms, used either to obtain information about table structure or query execution plans.
What is filtered in explain MySQL?
As described here in the MySQL docs: The filtered column indicates an estimated percentage of table rows that will be filtered by the table condition. That is, rows shows the estimated number of rows examined and rows × filtered / 100 shows the number of rows that will be joined with previous tables.
What is a query in a database?
A query is a request for data or information from a database table or combination of tables. This data may be generated as results returned by Structured Query Language (SQL) or as pictorials, graphs or complex results, e.g., trend analyzes from data-mining tools.
What is optimized table in MySQL?
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. ... After doing substantial insert, update, or delete operations on columns that are part of a FULLEST index in an InnoDB table.
What is table optimization in MySQL?
MySQL optimization using indexes. A database index is a data structure that improves the speed of operations in a table. Every time your web application runs a database query, the database will look through all the rows in your table to find those that match your request.
How long does optimize table 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 closer than 20x speed difference and more compact index in the end.
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