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Displaying posts with tag: data (reset)
Reduce MySQL Memory Utilization With ProxySQL Multiplexing

MySQL Adventures: Reduce MySQL Memory Utilization With ProxySQL Multiplexing

In our previous post, we explained about how max_prepared_statement_count can bring production down . This blog is the continuity of that post. If you can read that blog from the below link.

How max_prepared_stmt_count bring down the production MySQL system

We had set the max_prepared_stmt_count to 20000. But after that, we were facing the below error continuously.

Can't create more than max_prepared_stmt_count statements (current value: 20000)

We tried to increase it to 25000, 30000 and finally 50000. But unfortunately, we can’t fix it …

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On AI and Data Technology Innovation in the Rail Industry. Interview with Gerhard Kress

“I think the biggest challenge is that in the rail business we have a very large set of old and country specific regulations that date back many decades. These regulations are meant to protect passengers, but some of them are not anymore fitting to the modern capabilities of technology and instead drive cost and slow innovation down dramatically.” –Gerhard Kress

Artificial intelligence acts as an enabler for many innovations in the rail industry.
In this interview, I have spoken with Gerhard Kress, who is heading Data Services globally for the Rail business, and is responsible for the Railigent ® solution at Siemens. We discussed innovation and the use of AI and Data-driven technologies in the transport sector, and specifically how the Siemens´ Railigent solution is implemented.

Railigent is cloud based, designed to help rail operators and rail asset …

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De-Normalization of Your Database with JSON

One of the humbling things about working at Oracle with the various MySQL personnel is that you are often blown away by something one of them says or does.  And that is on a regular basis.  In this case it is Dr. Charles Bell who gave a great series of presentations last June at the Southeast Linuxfest.
In particular he presented in a full formed state some ideas that had been rattling around in my  skull (but no way near as coherent) on how to take advantage of the MySQL JSON data type.  Below are his points from his slide deck.  I was reviewing my notes from his presentation when I realized that this information really needs to be more widely disseminated.   And I would like your feedback on these ideas?
1.. We can use a JSON field to eliminate one of the issues of traditional database solutions: many-to-many-joins

  • This allows more freedom to store unstructured data (data with pieces …
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Black-Box Auditing: Verifying End-to-End Replication Integrity between MySQL and Redshift

Since Yelp introduced its real-time streaming data infrastructure, “Data Pipeline”, it has grown in scope and matured vastly. It now supports some of Yelp’s most critical business requirements in its mission to connect people with great local businesses. Today, it has expanded into a diverse ecosystem of connectors sourcing data from Kafka and MySQL, and sinking data into Cassandra, Elasticsearch, Kafka, MySQL, Redshift, and S3. To ensure that the whole ecosystem is functioning correctly, Yelp’s Data Pipeline infrastructure is continually growing its repertoire of reliability techniques such as write-ahead logging, two-phase commit, fuzz testing, monkey testing, and black-box auditing to...

Array Ranges in MySQL JSON

Pretend you have a JSON array of data that looks roughly like the following.

mysql> insert into x(y) values('["a","b","c","d"]');
Query OK, 1 row affected (0.10 sec)


You could get all the values from that array using $[*]


mysql> select y->"$[*]" from x;
+----------------------+
| y->"$[*]" |
+----------------------+
| ["a", "b", "c", "d"] |
+----------------------+
1 row in set (0.00 sec)

Or the individual members of the array with an index that starts with zero.


mysql> select y->"$[0]" from x;
+-----------+
| y->"$[0]" |
+-----------+
| "a" |
+-----------+
1 row in set (0.00 sec)


But what about the times you want the last item in the array and really do not want to loop through all the items? How about using …

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Incremental MYSQL loads to BigQuery using Matillion

As part of building an enterprise DW for one of our customers we had to sync a bunch of tables from a MYSQL slave to BigQuery at 30 min intervals. Considering the range of other non-relational data sources which will be part of the this load, we chose Matillion as ETL tool. Matillion is easy to setup (just provision the VM and start authoring jobs) and long list of integrations so it made sense.

This post explains building a Matillion job that does the following:

  1. Full Load
  2. Incremental load for tables with larger row count and an ID that can be looked up for new rows since last load.

MYSQL Drivers

If you came from a Google search looking for Matillion — I am assuming you are done with provisioning the instance, setting up default project etc are done, so I am skipping those. While Matillion ships with PostgreSQL drivers, for some reason it doesn’t have MYSQL …

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Two New MySQL Books!

There are two new MySQL books both from Apress Press. One is an in depth master course on the subject and the other is a quick introduction.


ProMySQL NDB Cluster is subtitled Master the MySQL Cluster Lifecycle and at nearly 700 pages it is vital resource to anyone that runs or is thinking about running NDB Cluster. The authors, Jesper Wisborg Krogh and Mikiya Okuno, have distilled their vast knowledge of this difficult subject in a detail packed but easily readable book.  MySQL Cluster is much more complex in many areas than a regular MySQL server and here you will find all those details. If you run MySQL NDB Cluster then you need this book. The partitioning information in chapter 2 is worth the price of the book alone.  I am only a third of the way …

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Handy JSON to MySQL Loading Script

JSON in Flat File to MySQL DatabaseSo how do you load that JSON data file into MySQL. Recently I had this question presented to me and I thought I would share a handy script I use to do such work. For this example I will use the US Zip (postal) codes from JSONAR. Download and unzip the file. The data file is named zips.json and it can not be bread directly into MySQL using the SOURCE command. It needs to have the information wrapped in a more palatable fashion.

head zips.json 
{ "city" : "AGAWAM", "loc" : [ -72.622739, 42.070206 ], "pop" : 15338, "state" : "MA", "_id" : "01001" }
{ "city" : "CUSHMAN", "loc" : [ -72.51564999999999, 42.377017 ], "pop" : 36963, "state" : "MA", "_id" : "01002" }
{ "city" : "BARRE", "loc" : [ -72.10835400000001, 42.409698 ], "pop" : 4546, "state" : "MA", "_id" : "01005" }
{ "city" : "BELCHERTOWN", "loc" : [ -72.41095300000001, …
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How to interview an amazon database expert

via GIPHY Amazon releases a new database offering every other day. It sure isn’t easy to keep up. Join 35,000 others and follow Sean Hull on twitter @hullsean. Let’s say you’re hiring a devops & you want to suss out their database knowledge? Or you’re hiring a professional services firm or freelance consultant. Whatever the … Continue reading How to interview an amazon database expert →

Using find() with the MySQL Document Store

The VideoThe find() function for the MySQL Document Store is a very powerful tool and I have just finished a handy introductory video. By the way -- please let me have feed back on the pace, the background music, the CGI special effects (kidding!), and the amount of the content. The ScriptFor those who want to follow along with the videos, the core examples are below. The first step is to connect to a MySQL server to talk to the world_x schema (Instructions on loading that schema at the first link above).

\connect root@localhost/world_x

db is an object to points to the world_x schema. To find the records in the countryinfo collection, use db.countryinfo.find(). But that returns 237 JSON documents, too many! So lets cut it down to …

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