A student wanted a better example of writing a MySQL Persistent Stored Module (PSM) that maintains transactional scope across a couple tables. Here’s the one I wrote about ten years ago to build the MySQL Video Store model. It looks I neglected to put it out there before, so here it is for reference.

-- Conditionally drop procedure if it exists.
DROP PROCEDURE IF EXISTS contact_insert;

-- Reset the delimiter so that a semicolon can be used as a statement and block terminator.
DELIMITER $$

SELECT 'CREATE PROCEDURE contact_insert' AS "Statement";
CREATE PROCEDURE contact_insert
( pv_member_type         CHAR(12)
, pv_account_number      CHAR(19)
, pv_credit_card_number  CHAR(19)
, pv_credit_card_type    CHAR(12)
, pv_first_name          CHAR(20)
, pv_middle_name         CHAR(20)
, pv_last_name           CHAR(20)
, pv_contact_type        CHAR(12)
, pv_address_type        CHAR(12)
, pv_city                CHAR(30)
, pv_state_province      CHAR(30)
, …

MySQL Shell For VS Code integrates the MySQL Shell directly into VS Code development workflows and was released last week. This extension to the popular VS Code platform enables interactive editing and execution of SQL for MySQL Databases and optionally the MySQL Database Service for several simultaneous sessions.  It is a preview release and not ready for production but it does have several features that may make the MySQL GUI of choice.

Installation

The installation itself is easy but you will need to download the code from here and not the usual places for MySQL products.  You will, of course, have to have VS Code installed first, and be warned that some of the more tantalizing links for things like documentation are not connected.

MySQL Shell for VS Code installation screen and yes, you will need VS Code installed first.

Usage

The interface is familiar to that of MySQL Workbench but …

I recently needed to add multiple columns to an existing table to store summary data calculations and wondered if I could do it in one MySQL ALTER TABLE statement. Turns out you can. And, it’s super simple. Convenient too. Continue reading and learn what I learned…

Image by Gerd Altmann from Pixabay 

The Newsletter for PHP and MySQL Developers

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Read reactions and praises by leading industry analysts towards the March 2022 new feature announcement for Oracle MySQL HeatWave, a fully managed service that enables customers to run OLTP and OLAP workloads directly from their MySQL Database. New capabilities announced are: in-database machine learning, real-time elasticity to scale up or down, and compression, enabling 2X more data per node and a lower price entry point.

The utf8mb4 character set is the new default as of MySQL 8.0, and this change neither affects existing data nor forces any upgrades.

Migration to utf8mb4 has many advantages including:

• It can store more symbols, including emojis
• It has new collations for Asian languages
• It is faster than utf8mb3

Still, you may wonder how migration affects your existing data. This blog covers multiple aspects of it.

Storage Requirements

As the name suggests, the maximum number of bytes that one character can take with character set utf8mb4 is four bytes. This is larger than the requirements for utf8mb3 which takes three bytes and many other MySQL character sets.

Fortunately, utf8mb3 is a subset of …

New features and capabilities being introduced with MySQL HeatWave ML.

I’ve once again published a massive issue of the OpenLampTech newsletter, the newsletter for PHP/MySQL developers. If you’re looking to learn more about PHP and MySQL, you’ve come to the right place…

Image by Clker-Free-Vector-Images from Pixabay

The Newsletter for PHP and MySQL Developers

Receive a copy of my ebook, “10 MySQL Tips For Everyone”, absolutely free when you subscribe to the …

Anyone familiar with Oracle performance tuning knows about ASH , aka active session history. ASH saves a history of every session that is active every collection, which by default is once per second. Once per second is fast enough to give a clear view of database load.

The ASH data comes from v$session which is a structure that contains information on every connection and shows which connections are active, what SQL they are running (SQL_ID) and if they are runnable on CPU or waiting on a wait_event for some resource like an I/O to complete or a lock or latch. It’s a pretty simple select query on v$session to select who is active,  their wait_event and SQL_ID.

On Oracle that gives us a query like:

select sid||':'||serial# session_id,
       username,
       s.sql_id||':'||sql_child_number sqlid,
       decode(state, 'WAITING', wait_class||':'||event, 'CPU') event
from v$session s
where   (( s.wait_time != 0  /* on CPU  */ …

On 22nd March 2022 08:43 UTC, we became aware of the issue affecting Okta, a third-party identity provider that Percona uses for https://id.percona.com. Initially, there was no statement from Okta, so our Security Operations team reviewed the information available from LAPSUS$ and other public sources.

Based on the public information available about the issue, we evaluated the potential exposure to Percona and determined that the impact was minimal. Percona uses Okta integrations so https://id.percona.com can be used to authenticate against Percona’s deployments of:

• forums.percona.com (Discourse)
• percona.service-now.com (ServiceNow) 
• portal.percona.com (Dashboard portal interface where users & clients can add their PMM integration). 

Integrations of …

How does one use  NESTING_EVENT_ID?

Below I’ve selected from  events_waits_history_long for a single thread, but none of the  NESTING_EVENT_ID values show up in EVENT_ID or END_EVENT_ID.

To simplify things , I’m just showing the data for one THREAD_ID listed in order of TIMER_START.

mysql>  select 
            THREAD_ID,
            EVENT_ID,
            END_EVENT_ID,
            NESTING_EVENT_ID,
            NESTING_EVENT_TYPE,
            EVENT_NAME,
            SOURCE,
            TIMER_WAIT,
            SPINS,
            OBJECT_SCHEMA,
            OBJECT_NAME,
            INDEX_NAME,
            OBJECT_TYPE,
            OBJECT_TYPE,
            OBJECT_INSTANCE_BEGIN,
            OPERATION,
            NUMBER_OF_BYTES,
            FLAGS 
 from 
           performance_schema.events_waits_history_long 
 where 
            THREAD_ID in ( select max(thread_id) from performance_schema.events_waits_history_long where …