For 3 days I have the following query running:

alter table pois modify column id bigint(12) not null;

with the purpose to change the type from int(11) to bigint(12) and remove AUTO_INCREMENT on a table with 600.000.000 rows (40gb).

According the processlist the progress is now at: 31,4 with the status "copy to tmp table".

Is there any way to give more resources/speed up this process temporarily? Or is there a way to execute this query without backing up the table?

  • 1
    Sometimes it’s faster to just create a new table and insert stuff there, especially if it already needs to copy data to a temporary table. But there’s no real rule that I know of Commented Jul 18, 2022 at 9:46
  • ALTERing the PRIMARY KEY necessarily requires a copy. Removing AUTO_INCREMENT seems unnecessary; what was your rationale?
    – Rick James
    Commented Jul 18, 2022 at 17:03
  • @RickJames i wanted to remove auto_increament because i decided to use own unique values for id based on a formula, this requires altering the table with bigint. But its true i could keep auto_increament. So should i stop the query, try to remove the column (id, primary key) and readd with bigint ? Would that be faster ? Commented Jul 18, 2022 at 20:37
  • Depends on the version of MySQL.
    – Rick James
    Commented Jul 18, 2022 at 21:24
  • @RickJames 10.1.48-MariaDB-0ubuntu0.18.04.1 ; libmysql - mysqlnd 7.4.29. The query got stopped anyway as my provider moved my vps to another host to increase performance. Commented Jul 18, 2022 at 21:27

1 Answer 1

pt-online-schema-change --alter "MODIFY COLUMN id BIGINT(12) NOT NULL" D=your_database,t=your_table

Percona Toolkit provides a tool called "pt-online-schema-change" that can be used to make non-blocking schema changes


MySQL's ALTER TABLE statement allows you to specify the ALGORITHM option

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