MySQL 5.7 comes with a new set of features and multi-source replication is one of them. In few words this means that one slave can replicate from different masters simultaneously.

During the last couple of months I’ve been playing a lot with this trying to analyze its potential in a real case that I’ve been facing while working with a customer.

This was motivated because my customer is already using multi-sourced slaves with Tungsten Replicator and I wanted to do a side-by-side comparison between Tungsten Replicator and Multi-source Replication in MySQL 5.7

Consider the following scenario:

DB1 is our main master attending mostly writes from several applications, it also needs to serve read …

This Log Buffer Edition covers Oracle, SQL Server and MySQL blogs of the running week.

Oracle:

• While checking the sources of the Cassandra/NetBeans integration into GitHub yesterday, something went very badly wrong and ALL the source files in my Maven project that disappeared!
• AWR Reports, Performance Hub, historisches SQL Monitoring in 12c
• Oracle Database Mobile Server 12c: Advanced data synchronization engine
• ORA-39001, ORA-39000 and …

Practical tips and a live demo of how to get your data warehouse loading projects off the ground quickly and efficiently when replicating from MySQL and Oracle into Amazon Redshift, HP Vertica and Hadoop.

Webinar-on-demand. Recorded 07/23/15.

Continuing from our April 2015 release of the VMware Continuent 4.0 products is a new 4.0.1 release that provides important fixes to both the replication and MySQL clustering.For full details, read the full release notes, available at the links below, but the highlights are as follows: VMware Continuent for Replication and Data Warehousing

Expanded support for EBS Snapshots to enable MySQL table

Yet again, this log buffer edition brings some rich blog posts from Oracle, SQL Server and MySQL.

Oracle:

• Installing Oracle XE, ORDS and Apex on CentOS
• Major Growth is Expected in the DBaaS Space. Are Your Skills Ready?
• How to Hide Actions in OBPM 12c Workspace
• You can configure auto refresh for ADF BC cached LOV and this works out of the box, no special coding is needed.
• Search and …

This Log buffer edition covers Oracle, SQL Server and MySQL blog posts about new features, tips, tricks and best practices.

Oracle:

• Traditionally, assigning specific processes to a certain set of CPUs has been done by using processor sets (and resource pools). This is quite useful, but it requires the hard partitioning of processors in the system. That means, we can’t restrict process A to run on CPUs 1,2,3 and process B to run on CPUs 3,4,5, because these partitions overlap.
• Parallel_Degree_Limit, Parallel_Max_Degree, Maximum DOP? Confused?
• JDeveloper 12c – …

Introduction

The names of databases and tables within MySQL are known as identifiers. In the simplest case these identifiers are just strings of certain ASCII characters (the basic Latin letters, the digits 0-9, the dollar sign and the underscore). However, if an identifier is placed in quotes, it can contain any character of the full Unicode Basic Multilingual Plane (except U+0000). We say that a character is a special character if it is permitted in a quoted identifier but not in an unquoted identifier.

MySQL Enterprise Backup (MEB) 3.12.1 introduces support for proper handling of table and database names with special characters. In MEB versions prior to 3.12.1 database and table names were represented as ASCII strings and the same string was used on the command line, internally within MEB and in filenames.  This caused MEB to fail some …

Introduction

This is the sixth and final post in the series on the Pillars of PowerShell, at least part one of the final post. The previous posts in the series are:

1. Interacting
2. Commanding
3. Debugging
4. Profiling
5. Windows OS

PowerShell + SQL Server is just cool! You will see folks talk about the ability to perform a task against multiple servers at a time, automate implementing a configuration or database change, or just obtaining a bit of consistency when doing certain processes. I tend to use it just because I can, and it is fun to see what I can do. There are a …

Sometimes I give parts of a solution to increase the play time to solve a problem. I didn’t anticipate a problem when showing how to perform a sort operation with a CASE statement. It’s a sweet solution when you need to sort something differently than a traditional ascending or descending sort.

I gave my students this ORDER BY clause as an example:

  CASE
    WHEN filter = 'Debit' THEN 1
    WHEN filter = 'Credit' THEN 2
    WHEN filter = 'Total' THEN 3
  END;

It raises the following error in MySQL for students:

      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 'ORDER BY
  CASE
    WHEN filter = 'Debit' THEN 1
    WHEN filter = 'Credit' THEN' at line 6

It raises the …

This Log Buffer Edition cuts through the crowd and picks some of the outstanding blog posts from Oracle, SQL Server and MySQL.

Oracle:

• Continuous Delivery (CD) is a software engineering approach in which teams keep producing valuable software in short cycles and ensure that the software can be reliably released at any time.
• Query existing HBase tables with SQL using Apache Phoenix.
• Even though WebLogic with Active GridlLink are Oracle’s suggested approach to deploy Java applications that use Oracle Real Applications Clusters (RAC), …