Overview

MySQL Group Replication was released as GA with MySQL 5.7.17. It is essentially a plugin that, when enabled, allows users to set replication with this new way.

There has been some confusion about the stability and usability of this release. Until recently, MySQL Group Replication (MGR) was only available in the Labs, which traditionally denotes a preview or an use-at-your-own-risk feature. Several months ago we saw the release of Group Replication as a Docker image, which allowed users to deploy a peer-to-peer cluster (every node is a master.) However, about one month after such release, word came from Oracle discouraging this setup, and inviting users to use Group Replicator in …

This blog provides a query language type overview.

The idea for this blog originated from some customers asking me questions. When working in a particular field, you often a dedicated vocabulary that makes sense to your peers. It often includes phrases and abbreviations because it’s efficient. It’s no different in the database world. Much of this language might make sense to DBA’s, but it might sound like “voodoo” to people not used to it. The overview below covers the basic types of query languages inside SQL. I hope it clarifies what they mean, how they’re used and how you should interpret them.

DDL (Data Definition Language)

A database schema is a visualization of information. It contains the data structure separated by tables structures, views and anything that contains structure …

Recently I was testing data migration from MSSQL to MySQL using MySQL Workbench. My aim was to include data with all datatype available in MSSQL for migration. In this following blog post will see data migration prerequisites, migration steps and few common errors.

• About MySQL Workbench
• Prerequisite
• DATA SOURCE ODBC Configuration
• Required privileges on MS-SQL DB
• DB Servers Data Types …

“Isn’t it ironic that in 2016 a non-skilled user can find a web page from Google’s untold petabytes of data in millisecond time, but a highly trained SQL expert can’t do the same thing in a relational database one billionth the size?.–Jim Starkey.

I have interviewed Jim Starkey. A database legend, Jim’s career as an entrepreneur, architect, and innovator spans more than three decades of database history.

RVZ

Q1. In your opinion, what are the most significant advances in databases in the last few years?

Jim Starkey: I’d have to say the “atom programming model” where a database is layered on a substrate of peer-to-peer replicating distributed objects rather than disk files. The atom programming model enables scalability, redundancy, high availability, and distribution not available in traditional, disk-based database …

The MySQL Utilities Team is pleased to announce a new GA release of MySQL Utilities. This release includes a number of improvements for usability, stability, and a few enhancements for better compatibility with MySQL 5.7. A complete list of all improvements can be found in our release notes.

Many Improvements!
This release represents a stable release of the product and is a significant improvement from the 1.5 release. Along with defect patches, we also include the following enhancements.

• Support for MySQL 5.7 
• New! Binlog Utilities:
  • mysqlbinlogpurge - purge old binary logs
  • mysqlbinlogrotate - rotate the binary log
  • mysqlbinlogmove - relocate binary log files
• New! Replication Utilities: 
  …

The MySQL Document Store functionality allows developers to use a relation database with or without SQL (structured Query Language), also known as NoSQL. The example in this blog is hopefully a simple look at this new feature of MySQL. The example data used is from JSONStudio.com and is a JSON formatted data set for US zip (postal) codes (656K compressed). So download your copy of this data set and lets get to work.

Create a collectionCollections are tables and below we create a collection name 'zip' in the test database in the Python dialect.

mysqlsh -u root -p --py test
Creating an X Session to root@localhost:33060/test
Enter password:
Default schema `test` accessible through db.

Welcome to MySQL Shell 1.0.4 Development Preview

Copyright (c) 2016, Oracle and/or its affiliates. …

The “DBMS” part of MySQL is fine – storage engines (especially with new kids on the block), replication, etc, but it really sucks at executing SQL.

I won’t even get into complex SQL that has complex data dependencies, will start with very basic tasks.

SELECT * FROM table WHERE indexed = "A" LIMIT 1

If multiple indexes can satisfy the query, MySQL will hit each of them at least twice – looking up first “A” and last “A” records. It will do that while planning the SQL execution. Once it comes up with a plan, it will go and hit the index it picked again, this time once. So, if you have two candidate indexes, you will have 5 index accesses at 4 positions.

How would a direct cursor access work? Single index hit. Want to simulate that in SQL? You can add a ‘FORCE INDEX’ hint, then only one …

I made some improvements to the 'proxy' inside of MySQL 5.7 that I've created for WarpSQL (Shard-Query 3).  I've made the MySQL proxy/shim pluggable and I moved the SQLClient to sql/sql_client.cc.  I've merged these changes into 'master' in my fork.

Now you can create "SQL shim" plugins (SHOW PASSWORD is implemented in plugin/sql_shim) and install them in the server like regular plugins:

-- command doesn't work
mysql> show password;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'password' at line 1

-- install the example sql_shim plugin:
mysql> install plugin sql_shim soname 'sql_shim.so';                                                                 Query OK, 0 rows affected (0.00 sec)

-- now the command works
mysql> show password;
+--+
|  |
+--+
|  |
+--+
1 row in set (0.00 sec)

…

I made some improvements to the 'proxy' inside of MySQL 5.7 that I've created for WarpSQL (Shard-Query 3).  I've made the MySQL proxy/shim pluggable and I moved the SQLClient to sql/sql_client.cc.  I've merged these changes into 'master' in my fork.

Now you can create "SQL shim" plugins (SHOW PASSWORD is implemented in plugin/sql_shim) and install them in the server like regular plugins:

-- command doesn't work
mysql> show password;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'password' at line 1

-- install the example sql_shim plugin:
mysql> install plugin sql_shim soname 'sql_shim.so';                                                                 Query OK, 0 rows affected (0.00 sec)

-- now the command works
mysql> show password;
+--+
|  |
+--+
|  |
+--+
1 row in set (0.00 sec)

…

Is it cheating? Is using MySQL without Structured Query Language (SQL) or putting all your data into one column proper? Impossible a year ago and probably thought as a poor/crazy practice until recently, this is a new type of MySQL usage. NoSQL has had a big impact in the SQL world with several relational products from vendors like MySQL, Microsoft, Postgresql and others offering NoSQL interfaces and JSON data types to their databases.

Several old timers have come to me asking if putting lots of data in a JSON column is cheating? After all data normalization is part of relational databases and the way to efficiency and speed is well organized data. This higgledy–piggledy fashion of putting an entire document in a column without breaking it down to its component sections does violate the first rule of data normalization. And that has …