Does Mysqldump affect performance?
Using default mysqldump it quickly spirals the server load out of control and locks up everything… affecting my users. Trying to stop the process can lead to crashed tables and lots of downtime during recovery of those tables.
How can I speed up Mysqldump backup?
9 Answers
- Get a copy of High Performance MySQL.
- Extended inserts in dumps.
- Dump with –tab format so you can use mysqlimport, which is faster than mysql < dumpfile.
- Import with multiple threads, one for each table.
- Use a different database engine if possible.
How long does a MySQL dump take?
Although a mysqldump may take 30 minutes to complete, your restore of that data might take 8 hours or more. That’s due in part to rebuilding all those indexes.
Does Mysqldump compress data?
yes, it reduces a lot data transfer! But what I wanted to understand was: if the mysqldump caches the data on my pc or on the remote server.. From what I understood it does transfer all the data on my pc first.
What is Mysqldump — single transaction?
Mysqldump with Transactions The –single-transaction flag will start a transaction before running. Rather than lock the entire database, this will let mysqldump read the database in the current state at the time of the transaction, making for a consistent data dump.
How do I make MySQL restore faster?
Here is how it works:
- Generate a query to create table schema, procedures and functions of the source DB.
- Generate a query to find all indexes of all tables except foreign key constraints of the source DB.
- Generate a query to drop all the indexes found in step 2.
- Generate a query to insert all data of the source DB.
How do I export a large MySQL database?
Step-by-step MySQL backup procedure
- Set compression for the connection.
- Choose a database for export and open Database Backup Wizard.
- Set options to create an all-of-a-piece database snapshot.
- Make a backup of your MySQL database.
- Choose a database to import and open Database Restore Wizard.
- Import the database.
Why should you add the add/drop table to the Mysqldump utility?
Why should you add the “add-drop-table” to the mysqldump utility? A. It will remove all MySQL tables before creating the restored tables.
How do I dump all databases?
To dump entire databases, do not name any tables following db_name , or use the –databases or –all-databases option. To see a list of the options your version of mysqldump supports, issue the command mysqldump –help .
How do I ignore a table in SQL dump?
mysqldump -uusrname -ppwd -h hostname –ignore-table=db.view1 –ignore-table=db.view2 db > db.sql NOTE: to ignore multiple views for dump use –ignore-table option multiple times. Show activity on this post.
What are the mysqldump options?
Other mysqldump options can also export different styles of INSERT commands, log file and position coordinates from binary logs, database creation options, partial data (–where option), and so forth. mysql -h… -u… -p…
How to parallel dump multiple databases in MySQL?
Once you compile the list of databases, you can proceed to loop through the list and mysqldump them, even in parallel if so desired. If there are too many databases to launch at one time, parallel dump them 10 at a time: mysql -h… -u… -p…
What are the drawbacks of MySQL mysqldumps?
The drawback is that mysqldumps created this way can only be reloaded into the same majot release version of mysql that the mysqldump was generated. In other words, a mysqldump from a MySQL 5.0 database cannot be loaded in 5.1 or 5.5. The reason? The mysql schema is total different among major releases.
