The article presents a detailed tutorial on MySQL JOINs. In it, you will learn about different types of JOINS that are supported in MySQL, their syntax, and how to use them. Introduction to MySQL JOINsDifferent types of JOINs in MySQL1. MySQL INNER JOIN clause2. MySQL OUTER JOINs2.1 MySQL LEFT JOIN clause2.2 MySQL RIGHT JOIN clause3. […]
The post MySQL JOINs Tutorial with Examples appeared first on Devart Blog.
If you have (too) long running select queries it is probably because of lack of relevant indexes, problematic schema that lead to poor queries or inadequate hardware.
That said, sometime even if you doing it right, the query execution time could be too long regarding of what the application or your users expect. It is often true for reporting, real time analytics or BI queries.
At Oracle we have developed Heatwave, that allow you to easily run high performance analytics against your MySQL database.
To be more precise, Heatwave is a massively-scalable integrated analytics engine for MySQL Database Service (MDS), the MySQL DBaaS in Oracle Cloud Infrastructure (OCI).
Some key points of Heatwave:
- Single MySQL database for OLTP & analytics applications
- All existing applications work without any changes
- Extreme performance:
+ 400x faster than MySQL, scales to thousands of cores
…
MySQL InnoDB Cluster is the High Availability solution for MySQL.
It delivers automatic fail-over and guarantees zero data loss
(RPO=0).
RPO: Recovery Point Objective describes the interval of time that might pass during a disruption before the quantity of data lost during that period exceeds the Business Continuity Plan’s maximum allowable tolerance.
Example: our business architecture needs to have RPO=2 minutes. This means that in case of failure, 2 minutes of data can be lost.
However, and we saw this recently in Europe, an entire data center can “disappear” instantaneously… So it’s also important to have a Disaster Recovery plan.
One solution, is to have an InnoDB Cluster (Group Replication) that spans across multiple regions. However, this is often not feasible because of high latency across regions.
Another solution is InnoDB Cluster in one region with Asynchronous …
[Read more]Chasing bugs can be a tedious task, and multi-threaded software doesn’t make it any easier. Threads will be scheduled at different times, instructions will not have deterministic results, and in order for one to reproduce a particular issue, it might require the exact same threads, doing the exact same work, at the exact same time. As you can imagine, this is not straightforward.
Let’s say your database is crashing or even having a transient stall. By the time you get to it, the crash has happened and you are stuck restoring service quickly and doing after-the-fact forensics. Wouldn’t it be nice to replay the work from right before or during the crash and see exactly what was happening?
Record and Replay is a technique where we record the execution of a program allowing it to be replayed over and over producing the same result. Engineers at …
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There are many ways to test and edit files. A lot of developers only use their favorite Integrated Developer Environment (IDE) but I find testing script files within the scope of a pipelined set of scripts much faster.
The ability to edit a script from within the MySQL Command-Line Interface (CLI) or MySQL Shell would be nice but unfortunately, doesn’t exist. You can always subshell to edit a file or list files in the present working directory, like:
mysql> \! vi task.sql
I prefer to test at the OS level while leveraging the up-arrow key for command history. Here’s my quick edit and test script technique from your present working directory:
task.sql test file, like:
SELECT user() AS "Current User"\G
vi or emac and
test the script interactively from the present working directory.
We are proud to announce the latest release of ProxySQL version 2.0.18 on the 8th of April 2021
ProxySQL is a high performance, high availability, protocol aware proxy for MySQL, with a GPL license! It can be downloaded from the ProxySQL Repository (instructions here) or for a Docker image check out the Official ProxySQL Docker Repository. ProxySQL is freely usable and accessible according to the GNU GPL v3.0 license.
Release Overview Highlights
ProxySQL v2.0.18 is a patch release comprising of minor
backward compatible changes and bug fixes.
Be sure to try out the ProxySQL 2.0.18 release and …
[Read more]In the second and final part of our mysqldump best practices we will talk about how to handle the migration and import for stored program objects and views from your MySQL database. To read more about the prerequisites for a successful dump and restore operation for large MySQL databases, check out the first part of […]
Codership is pleased to announce a new Generally Available (GA) release of the multi-master Galera Cluster for MySQL 5.6, 5.7 and 8.0, consisting of MySQL-wsrep 5.6.51 (release notes, download), 5.7.33 (release notes, download) and 8.0.23 (release notes, download) with Galera replication library 3.33 ( …
[Read more]Today we are going to guide you on how to show all users in the MySQL users Database. A common ...
The post MySQL SHOW USERS: List All Users in a MySQL Database appeared first on RoseHosting.