Pass index to temporary table from regular table?

Question

I am creating a temp table with a query like this:

CREATE TEMPORARY TABLE temp_table
SELECT * FROM regular_table
WHERE 1

But regular_table

Answer 1

You could use CREATE TEMPORARY TABLE temp_table LIKE regular_table, but that will create all the indexes, so when you do INSERT INTO temp_table SELECT * FROM regular_table, the indexes will be rebuilt - which could be lengthy.

Or, you can create the table and add the index afterwards:

CREATE TEMPORARY TABLE temp_table
ALTER TABLE temp_table ADD FULLTEXT INDEX (foo,bar,baz)
INSERT INTO temp_table SELECT * FROM regular_table

but the index will be, again, updated on every insert.

Probably the most efficient way would be to create the temp table, insert all, build index afterwards:

CREATE TEMPORARY TABLE temp_table
ALTER TABLE temp_table ADD FULLTEXT INDEX (foo,bar,baz)
ALTER TABLE temp_table DISABLE KEYS
INSERT INTO temp_table SELECT * FROM regular_table
ALTER TABLE temp_table ENABLE KEYS

Again, you will have to wait for the index to build, except it will happen in one chunk, with the last ALTER statement.