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Displaying posts with tag: create (reset)
Online ALTER TABLE in MySQL 5.6

This is the low-level view of data dictionary language (DDL) operations in the InnoDB storage engine in MySQL 5.6. John Russell gave a more high-level view in his blog post April 2012 Labs Release – Online DDL Improvements. MySQL before the InnoDB Plugin

Traditionally, the MySQL storage engine interface has taken a minimalistic approach to data definition language. The only natively supported operations were CREATE TABLE, DROP TABLE and RENAME TABLE. Consider the following example:

CREATE TABLE t(a INT);
INSERT INTO t VALUES (1),(2),(3);
CREATE INDEX a ON t(a);
DROP TABLE t;

The CREATE INDEX statement would be executed roughly as follows:

CREATE TABLE temp(a INT, INDEX(a));
INSERT INTO temp SELECT * FROM t;
RENAME TABLE t TO temp2;
RENAME TABLE temp TO t;
DROP …
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