innodb
MySQL InnoDB: autoincrement non-primary key
Yes you can. You just need to make that column be an index. CREATE TABLE `test` ( `testID` int(11) NOT NULL, `string` varchar(45) DEFAULT NULL, `testInc` int(11) NOT NULL AUTO_INCREMENT, PRIMARY KEY (`testID`), KEY `testInc` (`testInc`) ) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8; insert into test( testID, string ) values ( 1, ‘Hello’ ); insert into test( …
How to set transaction isolation level (MySQL)
SET SESSION TRANSACTION ISOLATION LEVEL READ UNCOMMITTED SESSION is optional, just limits the setting to the current session. READ UNCOMMITTED is to be replaced with your desired level. https://dev.mysql.com/doc/refman/8.0/en/set-transaction.html
Joining InnoDB tables with MyISAM tables
What jumps out immediately at me is MyISAM. ASPECT #1 : The JOIN itself Whenever there are joins involving MyISAM and InnoDB, InnoDB tables will end up having table-level lock behavior instead of row-level locking because of MyISAM’s involvement in the query and MVCC cannot be applied to the MyISAM data. MVCC cannot even be …
Why doesn’t MySQL’s MyISAM engine support Foreign keys?
Kindly tell me, In this situation what engine I have to use for improve performance? The performance of each storage engine will depend on the queries you perform. However, be aware that different tables within the same database can use different storage engines. Why MyISAM engine does not support foreign key relationship and InnoDB does? …
Prevent auto increment on MySQL duplicate insert
You could modify your INSERT to be something like this: INSERT INTO tablename (tag) SELECT $tag FROM tablename WHERE NOT EXISTS( SELECT tag FROM tablename WHERE tag = $tag ) LIMIT 1 Where $tag is the tag (properly quoted or as a placeholder of course) that you want to add if it isn’t already there. …
How to disable index in innodb
Have you tried the following? SET autocommit=0; SET unique_checks=0; SET foreign_key_checks=0; From the MySQL References https://dev.mysql.com/doc/refman/8.0/en/optimizing-innodb-bulk-data-loading.html See Section “Bulk Data Loading Tips“
MySQL error: The maximum column size is 767 bytes
From Wamp Version 3.2.6 Just edit this file: C:\wamp64\bin\mysql\mysql8.0.27\my.ini Change the config for innodb-default-row-format value from innodb-default-row-format=compact to innodb-default-row-format=dynamic Restart mysql
How to configure MySQL 5.6 LONGBLOB for large binary data
The reason for this issue is a change in MySQL 5.6.20 as one could read in the change log: As a result of the redo log BLOB write limit introduced for MySQL 5.6, the innodb_log_file_size setting should be 10 times larger than the largest BLOB data size found in the rows of your tables plus …