I'm converting tables in an old MYISAM database to InnoDB to increase robustness in case of power loss etc. Dans les scripts ci-dessous, … With that in mind, I ran the ALTER TABLE command against one of the InnoDB tables identified as being fragmented (data_free > 0) and found that the data_free did not change afterwards. If you try to do an UPDATE over table_name, this UPDATE will be enqueued until the ALTER TABLE ends (if you do a SHOW FULL PROCESSLIST you will see a "Waiting for table metadata lock" message associated to the UPDATE). When you specify an ENGINE clause, ALTER TABLE rebuilds the table.
ALTER TABLE table_name ENGINE=InnoDB; Cloning the Structure of a Table You might make an InnoDB table that is a clone of a MyISAM table, rather than using ALTER TABLE to perform conversion, to test the old and new table side-by-side before switching.
SELECT CONCAT('ALTER TABLE ',TABLE_NAME,' ENGINE=InnoDB;') FROM INFORMATION_SCHEMA.TABLES WHERE ENGINE='MyISAM' AND table_schema = 'mydatabase'; Fonctionne comme un charme. 2. The query below lists all InnoDB tables in all user databases.
Tables are implicitly created in file-per-table tablespaces when the innodb_file_per_table … Viewed 3k times 2. You might make an InnoDB table that is a clone of a MyISAM table, rather than using ALTER TABLE to perform conversion, to test the old and new table side-by-side before switching. You can create an InnoDB table in an external directory by specifying a DATA DIRECTORY clause in the CREATE TABLE statement.. $ mysql -u root -p. Then run: SELECT CONCAT('ALTER TABLE ',TABLE_NAME,' ENGINE=InnoDB;') FROM INFORMATION_SCHEMA.TABLES WHERE ENGINE='MyISAM' AND table_schema = 'mydb'; Replace mydb with your actual database name. default-storage-engine = InnoDB. Ask Question Asked 9 years, 2 ... ('ALTER TABLE ', TABLE_NAME,' ENGINE=MYISAM;') FROM Information_schema.TABLES WHERE TABLE_SCHEMA = 'db_name' AND ENGINE = 'InnoDB' AND TABLE_TYPE = 'BASE TABLE'" | tail -n+2 >> alter.sql Update username and db_name values with your own values. I'm using Mysql 5.5.x. SELECT CONCAT('ALTER TABLE ',TABLE_NAME,' ENGINE=InnoDB;') FROM INFORMATION_SCHEMA.TABLES WHERE ENGINE='MyISAM' AND table_schema = 'mydatabase'; Fonctionne comme un charme. Simpler way to convert all tables from InnoDB to MyISAM. I found a query way is more convenient as of my understanding so any suggestion for a change it all table engine at once?
Create an empty InnoDB table with identical column and index definitions.
Then enter the command and repeat the process for each table in the database that you want to change to whatever format.
To list MyISAM tables from current database use this query.. Query select table_schema as database_name, table_name from information_schema.tables tab where engine = 'InnoDB' and table_type = 'BASE TABLE' and table_schema not in ('information_schema', 'sys', 'performance_schema','mysql') -- and table… If you need to perform this task on a single Database, replace DBNAME with the name of your Database; if you need to do that on multiple Databases, add one or more additional OR conditions to the WHERE and let MySQL do the rest. I also tried to update the my.ini file by adding the code below but it doesn't work! ALTER TABLE t1 ENGINE = InnoDB; See Section 14.6.1.5, “Converting Tables from MyISAM to InnoDB” for considerations when switching tables to the InnoDB storage engine.
Timeout on ALTER TABLE table ENGINE=InnoDB - is table still converted? Make sure that you do not fill up the tablespace: InnoDB tables require a lot more disk space than MyISAM tables. 50 . Dans les scripts ci-dessous, remplacez , et par vos … ALTER TABLE wp_downloads ENGINE=ANYTHING; Simply replace ANYTHING with the type that you want to use. This is true even if the table already has the specified storage engine. Cela vous donnera la liste de toutes les tables avec les requêtes alter que vous pouvez exécuter dans un lot. Ask Question Asked 6 years, 6 months ago. It’s still greater than 0. Active 3 years ago. If an ALTER TABLE operation runs out of space, it starts a rollback, and that can take hours if it is disk-bound. 4 juin 2015 Omkar Kulkarni. Others say that OPTIMIZE actually calls the ALTER TABLE command when executing against InnoDB tables. I try change my table from InnoDB to ARCHIVE with SQL command: ALTER TABLE data_obook ENGINE = ARCHIVE; But it always show me only error: #1005 - Can't create table … Also remember to replace the table name wp_downloads to match the name of the table that you want to change. ALTER TABLE tbl_name ENGINE=INNODB; What else I have tried? to change table_name from MyIsam to InnoDB, there will be a metadata locking (at table level) because the original table engine was MyIsam. CREATE TABLE t1 (c1 INT PRIMARY KEY) DATA DIRECTORY = '/external/directory'; The DATA DIRECTORY clause is supported for tables created in file-per-table tablespaces.