#MYSQL RENAME TABLE FULL#
SHOW FULL PROCESSLIST while waiting for the FLUSH to complete (if there's a delay) will give you an idea of things that might get in the way of the rename operation, and you can safely KILL the flush if you need to. so it gives you a good test of what to expect and would be a good idea to run first, since it's typically going to make the actual rename operation slightly shorter by leaving less work for the rename to do. Busuhra Saad Rename an Existing Column in a Table in MySQL Show CREATE TABLE Statements of Existing Tables in MySQL Add a New Column to an Existing Table in. To rename MySQL Table, Open mysql command line by logging to MySQL server. the table is automatically reopened by the next statement that accesses it. If you are able to execute a FLUSH TABLES table_name statement and have it return within a few seconds, that should serve as confirmation that the rename operation will complete in a similar amount of time, since it will need the same locks in order to remove any entries in the query cache related to the table, close the table, and clean up some internal structures like the table share object.
The major delay you could see will come from other sessions preventing the RENAME from starting because the locks can't be immediately required. Note that's a link to the 5.0 documentation, and the 5.1, 5.5, 5.6, and 5.7 all have the same information. To rename a table in MySQL, you can use the RENAME TABLE statement. DROP COLUMN DateOfBirth The 'Persons' table will now look like this: ID. We use the following SQL statement: Example Get your own SQL Server.
If you use ALTER TABLE tbl_name RENAME TO new_tbl_name without any other options, MySQL simply renames any files that correspond to the table tbl_name without making a copy. RENAME TABLE employees TO staff After executing this statement, the table employees will no longer exist, and staff will contain all the data and schema of the original table. Next, we want to delete the column named 'DateOfBirth' in the 'Persons' table. Select the required Database which table.
#MYSQL RENAME TABLE HOW TO#
Type the new database name, then click Proceed. How to rename MySQL Database table from phpMyAdmin Print Log in to cPanel. Scroll down to the database you want to rename and select the Rename link under the Actions column. Renaming a table acquires a metadata lock on the table which requires that no statements be running against the table, no transactions have row locks, and no transactions are holding on to consistent snapshots of any MVCC versions of the table.Įither style of RENAME operation will attempt to acquire the metadata lock and subsequently-started statement impacting the table will block, waiting for the pending metadata lock. In the Databases section, click MySQL Databases. RENAME TABLE t1 TO t2 ĪLTER TABLE t1 RENAME TO t2 # as long as no other options to ALTER are also specified There are two statements that perform an equivalent operation.
Renaming a table in MySQL does not require a temporary table.
0 kommentar(er)
