Safely Replaying Large MySQL Dump Files Using PV to Limit Production Impact
This article demonstrates how to create a test database, export data with mysqldump, and then replay a large SQL dump into a busy MySQL instance while throttling the import speed with the pv tool to keep CPU usage low and avoid disrupting ongoing business operations.
Problem
The author needs to replay a large SQL dump immediately but worries that it will overwhelm the production database and affect business.
Experiment
First, a test database is created and some sample data is inserted. The data is then exported using mysqldump . The dump file is replayed directly into a busy MySQL instance, which causes the CPU usage to spike dramatically.
Next, the same dump is replayed using the pv utility to limit the data flow rate to the MySQL client. Monitoring shows that CPU usage remains calm and the data is processed slowly, demonstrating that throttling the import prevents heavy load on the production system.
Tip
The pv tool can display file stream progress and also limit the transfer speed. In this experiment, pv is used to restrict the speed of the SQL file sent to the MySQL client, achieving a controlled replay that does not impact other business workloads.
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