Percona Resources

Software
Downloads

All of Percona’s open source software products, in one place, to download as much or as little as you need.

Valkey Contribution

Product Documentation

Why Percona for MongoDB?

Why Percona for PostgreSQL?

Percona Blog

Percona Blog

Our popular knowledge center for all Percona products and all related topics.

Community

Percona Community Hub

A place to stay in touch with the open-source community

Events

Percona Events Hub

See all of Percona’s upcoming events and view materials like webinars and forums from past events

About

About Percona

Percona is an open source database software, support, and services company that helps make databases and applications run better.

Percona in the News

See Percona’s recent news coverage, press releases and industry recognition for our open source software and support.

Our Customers

Our Partners

Careers

Contact Us

marcos.albe

Connect to MySQL after hitting ERROR 1040: Too many connections

ERROR 1040…again A pretty common topic in Support tickets is the rather infamous error: ERROR 1040: Too many connections. The issue is pretty self-explanatory: your application/users are trying to create more connections than the server allows, or in other words, the current number of connections exceeds the value of the max_connections variable. This situation on […]

Correct Index Choices for Equality + LIKE Query Optimization

As part of our support services, we do a lot of query optimization. This is where most performance gains come from. Here’s an example of the work we do. Some days ago a customer arrived with the following table:

And a query that looked like this:

The table had an index t_msg that wasn’t […]