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Dealing With “Too Many Connections” Error in MySQL 8

Percona

Over the years of being a DBA, I had to deal with all kinds of problems in the database. Still, the users keep falling into this trap, maybe because of a poorly configured database, a change in the application components, or just because of a sudden increase of connections in the application. A lot has been written about this error.

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When Do SQL Server Sorts Rewind?

SQL Performance

If you’re interested in table-valued function rewinds, please see my Q & A on Database Administrators Stack Exchange. The Sort operator’s rewind behaviour may seem strange, but it has been this way from (at least) SQL Server 2000 to SQL Server 2019 inclusive (as well as Azure SQL Database). Sort Rewinds.

Servers 106
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Save Money in AWS RDS: Don’t Trust the Defaults

Percona

After some time of receiving these messages, eventually, they hit performance issues to the point that the server becomes unresponsive for a few minutes. The innodb_io_capacity_max parameter was set to 2000, so the hardware should be able to deliver that many IOPS without major issues. After that, things went back to normal.

AWS 126
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tempdb Enhancements in SQL Server 2019

SQL Performance

I have been making the same recommendations about tempdb since I started working with SQL Server over 15 years ago, when I was working with customers running version 2000. From the customer side, this has been the limit of what can be done*, until SQL Server 2019. I have SQL Server 2019 CTP 3.2 Now that 2019 CTP 3.2

Servers 95
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Powering the Web: Two Decades of Open Source Publishing With WordPress and MySQL

Percona

WordPress also benefited from and popularized MySQL, introducing the LAMP stack – and open source – to an audience that might never have touched a database before or had any intro to open source. MySQL was founded in 1995 and went open source in 2000. MySQL was the database for phpWebLog, for example, way back in 2000.

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How to Install or Upgrade Percona Server for MySQL/MySQL 8 to a Specific Version on Debian/Ubuntu

Percona

Sometimes we might need to install/upgrade Percona Server for MySQL /MySQL 8 to a particular version in a test or production environment. Install Percona Server for MySQL 8 specific version packages via repository. Download specific Percona Server for MySQL 8 tarball packages and install them manually. bullseye amd64 1.7

Servers 88
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Impact of Querying Table Information From information_schema

Percona

On MySQL and Percona Server for MySQL , there is a schema called information_schema (I_S) which provides information about database tables, views, indexes, and more. The same tests have been executed in Percona Server for MySQL 5.7 Results for Percona Server for MySQL 5.7 Results for Percona Server for MySQL 5.7

Cache 109