Modifying columns of very large mysql tables with little or no downtime

The right way to solve the problem is to add a new table with a 1:1 relationship to the base table (non-obligatory on the new table).

Alter large table without downtime - DBA Stack Exchange

GIVE IT A TRY !!! · I really appreciate your answer, I can try to execute the alter command that you provided in maintenance window on stage ...

Alter large table without downtime - mysql - Stack Overflow

The use of triggers means that the tool will not work if any triggers are already defined on the table. · Does not provide any good way of ...

How to alter large MySQL tables on production? - DEV Community

How to alter large MySQL tables on production? · Evaluate the term. Large is subjective: sometimes, a wide table with 1m rows will be the biggest ...

ALTERing a Huge MySQL Table

(aka pt-osc) can do an ALTER with very little downtime. It does, however, require adding a TRIGGER to the table. ... is a new and promising competitor to pt- ...

Alter table add column very slow on large tables. Any strategies to ...

Adding a column to a large MySQL table can be a slow process, particularly if the table contains millions of rows. To reduce the impact on ...

How we Altered a MySQL Table with 50 Million Rows without ...

One option was percona-online-schema-change which is pretty popular to do this kind of stuff. It basically makes a ghost table (with new schema), points a bunch ...

Altering a column in a large table: A case study

This should work because adding the new column is a schema change only so it will be almost instant and take no extra space. · Once I start ...

Migrating a Huge MySQL Database With Minimal Downtime

In order to speed up the dump, I decided to create a clone of the DB schema that would only hold updates and deletes of the dynamic tables.

Making a change to a large database table | by FutureLearn - Medium

In this blog post, Jamie Cobbett, one of our Technical Leads, talks about a technique to make changes to very large database tables whilst minimising downtime.

Running MySQL OPTIMIZE without downtime | by Mitesh Gupta

How to achieve this without Downtime? · Create a new table similar to the existing table · Copy the table data into the new table · Run an ANALYZE ...

Zero downtime MySQL schema migrations for 400M row table - One2N

DB schema migrations on large tables (400+ million rows or 150+ GB in size for a single table) caused replication lag and impacted latencies. Adding indexes on ...

[Video] Altering Datatypes With (Almost) No Downtime

So what this means is that you just need to prepare the ALTER TABLE command for a time window where you can deal with the higher writes due to data & log file ...

MySQL 8.0: InnoDB now supports Instant ADD COLUMN

MySQL now supports a new algorithm called INSTANT for ALTER TABLE. Along with this, the most exciting part is that now ADD COLUMN (at last) can ...

MySQL 8.4 Reference Manual :: 15.7.3.4 OPTIMIZE TABLE Statement

It does not work for fixed-width columns of in-memory tables, nor does it work for Disk Data tables. The performance of OPTIMIZE on NDB Cluster tables can be ...

MySQL 8.0 INSTANT ADD and DROP Column(s)

Now, if a new column is to be added or an old column is to be dropped from a table, the contents of existing rows should be changed to reflect ...

pt-online-schema-change — Percona Toolkit Documentation

pt-online-schema-change emulates the way that MySQL alters tables internally, but it works on a copy of the table you wish to alter.

MySQL 8.4 Reference Manual :: 18.3 The MEMORY Storage Engine

The server needs sufficient memory to maintain all MEMORY tables that are in use at the same time. Memory is not reclaimed if you delete individual rows from a ...

MySQL Query Optimization: Faster Performance & Data Retrieval

Only select the columns you need instead of using "SELECT *." This reduces the amount of data transferred and improves database performance. Use ...

ALTER TABLE - MariaDB Knowledge Base

ALTER TABLE enables you to change the structure of an existing table. For example, you can add or delete columns, create or destroy indexes, change the type of ...