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How to use pt online schema change?
pt-online-schema-change works by creating an empty copy of the table to alter, modifying it as desired, and then copying rows from the original table into the new table. When the copy is complete, it moves away the original table and replaces it with the new one. By default, it also drops the original table.
How do you show triggers?
To view database level triggers, Login to the server using SQL Server management studio and navigate to the database. Expand the database and navigate to Programmability -> Database Triggers. To view triggers at the server level, Login to Server using SSMS and navigate to Server Objects and then Triggers folder.
What does percona?
Percona is an American company based in Durham, North Carolina and the developer of a number of open source software projects for MySQL, MariaDB, PostgreSQL, MongoDB and RocksDB users. The company’s revenue of around $25 million a year is derived from support, consultancy and managed services of database systems.
What is PT Archiver?
DESCRIPTION. pt-archiver is the tool I use to archive tables as described in http://tinyurl.com/mysql-archiving. The goal is a low-impact, forward-only job to nibble old data out of the table without impacting OLTP queries much. You can insert the data into another table, which need not be on the same server.
What is PT table checksum?
pt-table-checksum performs an online replication consistency check by executing checksum queries on the master, which produces different results on replicas that are inconsistent with the master. The optional DSN specifies the master host.
How do I check my DB triggers?
How do you know if a table has a trigger?
Just go to your table name and expand the Triggers node to view a list of triggers associated with that table. Right click to modify your trigger. This way you can list out all the triggers associated with the given table.
Is Percona faster than MySQL?
With Percona Server for MySQL, Your queries will run faster and more consistently. You will consolidate servers on powerful hardware. You will delay sharding, or avoid it entirely….Percona Server for MySQL Feature Comparison.
Features | Percona Server for MySQL 8.0.13 | MySQL 8.0.13 |
---|---|---|
TokuDB Storage Engine | Yes | No |
Is Percona XtraDB cluster free?
Percona XtraDB Cluster is a free, open source solution. Key Percona XtraDB Cluster features include synchronous replication, automatic node provisioning, and support for multi-master replication and parallel applying events (known as “parallel replication”).
How to disable replication of schema changes in SQL Server?
To disable replication of schema changes. On the Subscription Options page of the Publication Properties – dialog box, set the value of the Replicate schema changes property to False. Click OK.
How to propagate a change in a schema?
To propagate only specific schema changes, set the property to **True** before a schema change, and then set it to **False** after the change is made. Conversely, to propagate most schema changes, but not a given change, set the property to **False** before the schema change, and then set it to **True** after the change is made.
Where did online schema change concept come from?
The “online schema change” concept was first implemented by Shlomi Noach in his tool oak-online-alter-table, part of http://code.google.com/p/openarkkit/. Engineers at Facebook then built another version called OnlineSchemaChange.php as explained by their blog post: http://tinyurl.com/32zeb86.
Why does PT-online schema change Percona not work?
Any modifications to data in the original tables during the copy will be reflected in the new table, because the tool creates triggers on the original table to update the corresponding rows in the new table. The use of triggers means that the tool will not work if any triggers are already defined on the table.