Hey hey! I’ve published another issue of OpenLamp.tech, the newsletter for PHP/MySQL developers over the weekend. Come and enjoy the great content!!!

As always, I’ve curated some great reads this week for us all. I’d love it if you could help spread the word by sharing these posts with others who will value the newsletter as well.

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The Newsletter for PHP and MySQL Developers

We have a range of posts in this week’s issue covering:

• A huge list of 52 SQL optimization strategies.
• Installing WordPress on Oracle Linux.
• A look at PHP’s isset() language construct.
• Fixing the “too many redirects” error in WordPress.

Don’t wait on me to repost here each Monday. That’s 3 whole days you are waiting to read OpenLamp.tech and you don’t want to do that right? …

In 2009, I showed an example of how to use the MySQL LOAD DATA INFILE command. Last year, I updated the details to reset the secure_file-priv privilege to use the LOAD DATA INFILE command, but you can avoid that approach with a simple Python 3 program like the one in this example. You also can use MySQL Shell’s new parallel table import feature, introduced in 8.0.17, as noted in a comment on this blog post.

The example requires creating an avenger table, avenger.csv file, a readWriteData.py Python script, run the readWriteData.py Python script, and a query that validates the insertion of the avenger.csv file’s data into the avenger table. The complete code in five steps using the sakila demonstration database:

• Creating the …

Percona XtraDB Cluster 8.0.25 has introduced a new option to perform online schema modifications: NBO (Non Blocking Operation).

When using PXC the cluster relies on wsrep_OSU_method parameter to define the Online Schema Upgrade (OSU) method the node uses to replicate DDL statements.  

Until now we normally have 3 options:

• Use Total Isolation Order (TOI, the default)
• Use Rolling Schema Upgrade (RSU)
• Use Percona’s online schema change tool (TOI + PTOSC)

Each method has some positive and negative aspects. TOI will lock the whole cluster from being able to accept data modifications for the entire time it takes to perform the DDL operation. RSU …

Percona XtraDB Cluster 8.0.25 has introduced a new option to perform online schema modifications: NBO (Non Blocking Operation).

When using PXC the cluster relies on wsrep_OSU_method parameter to define the Online Schema Upgrade (OSU) method the node uses to replicate DDL statements.  

Until now we normally have 3 options:

• Use Total Isolation Order (TOI, the default)
• Use Rolling Schema Upgrade (RSU)
• Use Percona’s online schema change tool (TOI + PTOSC)

Each method has some positive and negative aspects. TOI will lock the whole cluster from being able to accept data modifications for the entire time it takes to perform the DDL operation. RSU …

Percona XtraDB Cluster 8.0.25 (PXC) has introduced a new option to perform online schema modifications: NBO (Non-Blocking Operation).

When using PXC, the cluster relies on the wsrep_OSU_method parameter to define the Online Schema Upgrade (OSU) method the node uses to replicate DDL statements. 

Until now, we normally have three options:

• Use Total Isolation Order (TOI, the default)
• Use Rolling Schema Upgrade (RSU)
• Use Percona’s online schema change tool (TOI + PTOSC)

Each method has some positive and negative aspects. TOI will lock the whole …

We have a quickstart guide for how to install Percona Distribution for MySQL Operator on minikube. Installing the minimal version works well as it is described in the guide. After that, we will have one HAproxy and one Percona XtraDB Cluster (PXC) node to work with.

Minikube provides Kubernetes locally. One can try using the provided local k8s to try the more advanced scenarios such as the one described here.

Following that guide, everything works well, until we get to the part of deploying a cluster with

deploy/cr.yaml

Even after that, things seemingly work.

$ kubectl get pods
NAME READY STATUS RESTARTS AGE …

Working through our chapter on MySQL views, I wrote the query two ways to introduce the idea of SQL tuning. That’s one of the final topics before introducing JSON types.

I gave the students this query based on the Sakila sample database after explaining how to use the EXPLAIN syntax. The query only uses only inner joins, which are generally faster and more efficient than subqueries as a rule of thumb than correlated subqueries.

SELECT   ctry.country AS country_name
,        SUM(p.amount) AS tot_payments
FROM     city c INNER JOIN address a
ON       c.city_id = a.city_id INNER JOIN customer cus
ON       a.address_id = cus.address_id INNER JOIN payment p
ON       cus.customer_id = p.customer_id INNER JOIN country ctry
ON       c.country_id = ctry.country_id
GROUP BY ctry.country;

It generated the following tabular explain plan output:

 …

In this tutorial, we are going to show you how to install MySQL on your Ubuntu 20.04 and how to ...

Read More

The post How to Install and Use MySQL on Ubuntu 20.04 appeared first on RoseHosting.

Over the weekend I’ve published another issue of OpenLamp.tech, the newsletter for PHP/MySQL developers. There is plenty of great curated content for you so dive right in and enjoy!

If you’re a PHP/MySQL developer, this free weekly newsletter is for you.

I’ve curated some great reads for you this week from around the web. Stories you can enjoy in this issue are:

• Distance querying with MySQL geospatial functions in Laravel
• Cursors and for loops in MySQL stored procedures
• Great YouTube channel/video recommendations for learning PHP

Don’t wait on me each week to repost here. Sign up and have each issue delivered directly to your inbox so you don’t miss any.

The monthly deep-dive featured issue releases on the last Friday …

Recently we upgrade our database cluster to version 8.x .

Read this PDF to get some  experience    MySQL_8.x_upgrade