By Baron Schwartz, Arjen Lentz
High functionality MySQL is the definitive advisor to development quick, trustworthy platforms with MySQL. Written via famous specialists with years of real-world event construction very huge platforms, this publication covers each element of MySQL functionality intimately, and specializes in robustness, defense, and knowledge integrity. High functionality MySQL teaches you complicated suggestions intensive so that you can carry out MySQL's complete energy. find out how to layout schemas, indexes, queries and complex MySQL good points for max functionality, and get targeted counsel for tuning your MySQL server, working approach, and to their fullest capability. you are going to additionally research useful, secure, high-performance how one can scale your purposes with replication, load balancing, excessive availability, and failover. This moment version is totally revised and drastically extended, with deeper assurance in all parts. significant additions include:
- Emphasis all through on either functionality and reliability
- Thorough assurance of garage engines, together with in-depth tuning and optimizations for the InnoDB garage engine
- Effects of recent positive aspects in MySQL 5.0 and 5.1, together with kept systems, partitioned databases, triggers, and perspectives
- A designated dialogue on how one can construct very huge, hugely scalable platforms with MySQL
- New innovations for backups and replication
- Optimization of complicated querying positive aspects, comparable to full-text searches
- Four new appendices
The publication additionally contains chapters on benchmarking, profiling, backups, defense, and instruments and methods that will help you degree, display screen, and deal with your MySQL installations.
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Additional resources for High Performance MySQL: Optimization, Backups, Replication, and More
We propose you to again up your information first! * * * you could probably do the subsequent different types of operations with no desk rebuild: get rid of (but no longer upload) a column's AUTO_INCREMENT characteristic. upload, eliminate, or switch ENUM and SET constants. for those who get rid of a relentless and a few rows include that worth, queries will go back the worth because the empty string. the elemental procedure is to create a . frm dossier for the specified desk constitution and duplicate it into where of the present table's . frm dossier, as follows: Create an empty desk with the exact same format, with the exception of the specified amendment (such as additional ENUM constants). Execute FLUSH TABLES WITH learn LOCK. it will shut all tables in use and forestall any tables from being opened. switch the . frm records. Execute free up TABLES to free up the learn lock. for instance, we upload a continuing to the ranking column in sakila. movie. the present column seems like this: mysql> exhibit COLUMNS FROM sakila. movie LIKE 'rating'; +--------+------------------------------------+------+-----+---------+-------+ | box | variety | Null | Key | Default | additional | +--------+------------------------------------+------+-----+---------+-------+ | ranking | enum('G','PG','PG-13','R','NC-17') | definite | | G | | +--------+------------------------------------+------+-----+---------+-------+ We upload a PG-14 ranking for folks who're somewhat bit extra wary approximately movies: mysql> CREATE desk sakila. film_new LIKE sakila. movie; mysql> adjust desk sakila. film_new -> regulate COLUMN ranking ENUM('G','PG','PG-13','R','NC-17', 'PG-14') -> DEFAULT 'G'; mysql> FLUSH TABLES WITH learn LOCK; become aware of that we are including the hot price on the finish of the checklist of constants. If we put it within the heart, after PG-13, we would swap the that means of the present info: present R values may develop into PG-14, NC-17 might develop into R, and so forth. Now we change the . frm documents from the working system's command recommended: root:/var/lib/mysql/sakila# mv movie. frm film_tmp. frm root:/var/lib/mysql/sakila# mv film_new. frm movie. frm root:/var/lib/mysql/sakila# mv film_tmp. frm film_new. frm again within the MySQL suggested, we will now release the desk and notice that the alterations took influence: mysql> unencumber TABLES; mysql> express COLUMNS FROM sakila. movie LIKE 'rating'\G *************************** 1. row *************************** box: ranking kind: enum('G','PG','PG-13','R','NC-17','PG-14') the single factor left to do is drop the desk we created to aid with the operation: mysql> DROP desk sakila. film_new; development MyISAM Indexes speedy the standard trick for loading MyISAM tables successfully is to disable keys, load the knowledge, and reenable the keys: mysql> adjust desk try. load_data DISABLE KEYS; -- load the information mysql> modify desk attempt. load_data permit KEYS; This works since it we could MyISAM hold up construction the keys until eventually all of the information is loaded, at which element, it will probably construct the indexes through sorting. this can be a lot swifter and leads to a defragmented, compact index tree.  regrettably, it does not paintings for exact indexes, simply because DISABLE KEYS applies purely to nonunique indexes.