How to create a temporary table in MariaDB?
In that case, their name will reference the temporary table when used in SQL statements. You must have the CREATE TEMPORARY TABLES privilege on the database to create temporary tables. If no storage engine is specified, the default_tmp_storage_engine setting will determine the engine.
When to use or replace clause in MariaDB?
If the OR REPLACE clause is used and the table already exists, then instead of returning an error, the server will drop the existing table and replace it with the newly defined table. This syntax was originally added to make replication more robust if it has to rollback and repeat statements such as CREATE
When to create a temporary table in Java?
If the IF NOT EXISTS clause is used, then the table will only be created if a table with the same name does not already exist. If the table already exists, then a warning will be triggered by default. Use the TEMPORARY keyword to create a temporary table that is only available to the current session.
Can a non-temporary table have the same name as a temporary table?
A temporary table can have the same name as a non-temporary table which is located in the same database. In that case, their name will reference the temporary table when used in SQL statements. You must have the CREATE TEMPORARY TABLES privilege on the database to create temporary tables.
How to lower created TMP _ disk _ tables?
Set long_query_time = 1 and turn on the SlowLog, preferably to FILE. Wait a day, then use pt-query-digest on the slowlog to find the “worst” queries. If you can’t figure out how to improve them, ask us. RAM disk is a bad idea — it is better to give the extra RAM to other caches rather than trying to outsmart MySQL.
How to stop MySQL creating temporary tables on disk?
MySQL creates temporary tables on disk. How do I stop it? We are running a site (Moodle) that the users currently find slow. I think I have tracked down the problem to MySQL creating temporary tables on disk. I watch the variable created_tmp_disk_tables in Mysql Workbench server administration and the number increases with roughly 50 tables/s.
Why is TMP table in RAM in MySQL?
If the tmp table fits in min (tmp_table_size, max_heap_table_size), then the tmp table may be in RAM using Engine=MEMORY. If bigger than that, then the tmp table is Engine=MyISAM and is slower. There are other reasons for using MyISAM, most notably is selecting a TEXT field. More details.