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Read the original article at No tools to reconcile MySQL with two masters
Here’s the last nail in the coffin. We hope this convinces you not to write to multiple masters with MySQL replication. Reason 10 – No tools to reconcile inconsistent masters For all the endless reasons we’ve already outlined MySQL replication is prone to failure. We know it’s going to happen, you now know too. When [...]
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Related posts:Read the original article at Temp tables can break replication
If you’re not convinced yet that writing to dual masters is a bad idea, we have a couple more reasons. 9. Temp tables break replication after restart MySQL’s replication is sensitive to temporary tables. You shouldn’t use them. If your queries create them to work against, and a node crashes, the temp tables will be [...]
For more articles like these go to Sean Hull's Scalable Startups
Related posts:Read the original article at Crashed nodes corrupt your MySQL cluster
Writing to two masters is like walking around with a loaded shotgun. Eventually one of your instances will fail and when it does, replications position & synchronization information could easily become corrupt! Reason 8 – Crashed nodes cause big problems MySQL instances, unfortunately can crash. When that happens, they don’t always sync the replication position [...]
For more articles like these go to Sean Hull's Scalable Startups
Related posts:Read the original article at 10 reaons active-active is hard and how to solve it
Multi-master replication provides redundant copies of your most important business assets. What’s more it allows applications to scale out, which is perfect for cloud hosting solutions like Amazon Web Services. But when you decide you need to scale your write capacity, you may be considering active-active setup. This is dangerous, messy and prone to failure. [...]
For more articles like these go to Sean Hull's Scalable Startups
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Read the original article at The Art of Resistance
Sometimes, you have to be the bad guy. Be resistant to change. Here’s a story about how stubbornness pays off. As we’ve written about before A 4 letter word divides Dev & Ops.
I had one experience working as the primary MySQL DBA for an internet startup. Turns out they had Oracle for some applications too. And another DBA just to handle the Oracle stuff.
So it came time for Oracle guy to go on vacation. Suddenly these Oracle systems landed on my shoulders. We reviewed
[Read more...]Read the original article at Ten things to remember about MySQL backups
Hot backups are an excellent way to backup MySQL. They can run without blocking your application, and save tons on restore time. Percona’s xtrabackup tool is a great way to do this. We wrote a how-to on using xtrabackup for hotbackups.
Just because we love hot backups using xtrabackup doesn’t mean mysqldump isn’t useful. Want to load data into Amazon RDS? Want to isolate and load only one schema, or just
[Read more...]Read the original article at A History lesson for Cloud Detractors
We've all seen cloud computing discussed ad nauseam on blogs, on Twitter, Quora, Stack Exchange, your mom’s Facebook page... you get the idea. The tech bloggers and performance experts often pipe in with their graphs and statistics showing clearly that dollar-for-dollar, cloud hosted virtual servers can’t compete with physical servers in performance, so why is everyone pushing them? It's just foolhardy, they say.
On the other end, management and their bean counters would
[Read more...]Read the original article at Book Review – Effective MySQL
Effective MySQL: Optimizing SQL Statements by Ronald Bradford No Nonsense, Readable, Practical, and Compact I like that this book is small; 150 pages means you can carry it easily. It’s also very no nonsense. It does not dig too deeply into theory unless it directly relates to your day-to-day needs. And those needs probably cluster [...]
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Exciting news, Oracle just announced commercial MySQL extensions that they'll be offering paid extensions to the core MySQL free product.
To be sure, this has raised waves of concern among the community, but on the whole I suspect it will be a good thing for MySQL. This brings more commercial addons to the table, which only increases the options for customers. Many will continue to use the core database product only, and avoid license hassles while others will surely embark on a hybrid approach if it solves their everyday business problems.
Speaking of licensing, back in May, Amazon announced that it's RDS or Relational Database Service would now offer Oracle as an option.
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Database Administration and Management is as important under MySQL as it is under other enterprise database platforms such as Oracle or SQL Server. Be proactive with your database operations, and avoid outage or loss of your most crucial data.
Once a development or operations team gets over the hurdle of open-source, and start to feel comfortable with the way software works outside of the enterprise world, they will likely start to settle in and feel comfortable. Best not to get too cushy though for there are more surprises hiding around the corner. Here are a few of the biggest ones.
1. Replication Is Not Perfect
Yes, you've installed MySQL, setup a slave, and got it replicating properly. You check the slave and it's 0 seconds behind the master. What's more you monitor the error log file, and have a check in place to alert you if something happens there. Job completed, good job!
Not so fast. Unfortunately this is not the end of the story. Many MySQL replication slaves are not consistent with their masters, but they
[Read more...]1. Object Relational Mappers
ORMs are popular among developers but not among performance experts. Why is that? Primarily these two engineers experience a web application from entirely different perspectives. One is building functionality, delivering features, and results are measured on fitting business requirements. Performance and scalability are often low priorities at this stage. ORMs allow developers to be much more productive, abstracting away the SQL difficulties of interacting with the backend datastore, and allowing them to concentrate on building the features and functionality.
On the performance side the picture is a bit different. By leaving SQL query writing to an ORM, you are faced with complex queries that
[Read more...]Read the original article at 5 Tips for Better Database Change Management
Deploying new code that includes changes to your database schema doesn't have to be a process fraught with stress and burned fingers. Follow these five tips and enjoy a good nights sleep.
1. Deploy with Roll Forward & Rollback Scripts
When developers check-in code that requires schema changes, that release should also require two scripts to perform database changes. One script will apply those changes, alter tables to add columns, change data types, seed data, clean data, create new tables, views, stored procedures, functions, triggers and so forth. A release should also include a rollback script, which would return tables to their previous state.
This idea of
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1. This page or area of the website is very slow, why?
There are a lot of components that make up modern internet websites, and a lot of places to get stuck in the mud. Website performance starts with the browser, what caching it is doing, their bandwidth to your server, what the webserver is doing (caching or not and how), if the webserver has sufficient memory, and then what the application code is doing and lastly how it is interacting with the backend database.
With all this complexity, it's no wonder so many sites struggle. Typically these types of analysis start with some load testing, to stress test your setup, so you can watch for leaks. Then
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Amazon EC2 and cloud computing offer great promise for startups to ramp up their online presence quickly. Navigate those challenges with an strong partner. We bring 20 years experience to the table with each new client.
If you're headhunting a cloud computing expert, specifically someone who knows Amazon Web Services (AWS) and EC2, you'll want to have a battery of questions to ask them to assess their knowledge. As with any technical interview focus on concepts and big picture. As the 37Signals folks like to say "hire for attitude, train for skill". Absolutely!
1. Explain Elastic Block Storage? What type of performance can you expect? How do you back it up? How do you improve performance?
EBS is a virtualized SAN or storage area network. That means it is RAID storage to start with so it's redundant and fault tolerant. If disks die in that RAID you don't lose data. Great! It is also virtualized, so you can provision and allocate storage, and attach it to your server with various API
[Read more...]MySQL databases are great work horses of the internet. They back tons of modern websites, from blogs and checkout carts, to huge sites like Facebook. But these technologies don't run themselves. When you're faced with a system that is slowing down, you'll need the right tools to diagnose and troubleshoot the problem. MySQL has a huge community following and that means scores of great tools for your toolbox. Here are 7 ways to troubleshoot MySQL.
Innotop is a great tool for MySQL which despite the name monitors MySQL generally as well as InnoDB usage. It's fairly easy to install, just download the perl script. Be sure to include a [client] section to your local users .my.cnf file (you have one don't you?). Inside that section, place one line with "user=xyz" and one line with "password=abc".
If you're concerned that
[Read more...]MySQL in the Cloud
MySQL Consulting and Services
Deploying in the Amazon cloud is touted as a great way to achieve high scalability while paying only for the computing power you use. How do you get the best scalability from the technology?
1. Use Auto-scaling
Auto-scaling is a unique feature of cloud computing and Amazon's EC2 offering. Setup a load balancer and a couple of webservers for your application as you normally would. Design your webserver based on a template AMI that you'll reuse over and over. Then setup auto-scaling and set thresholds based on the traffic you forecast. When a threshold is passed, AWS will spinup a new instance of your webserver, and roll it into the load balancer pool
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There are a lot of scalability challenges we see with clients over and over. The list could easily include 20, 50 or even 100 items, but we shortened it down to the biggest five issues we see.
1. Tune those queries
By far the biggest bang for your buck is query optimization. Queries can be functionally correct and meet business requirements without being stress tested for high traffic and high load. This is why we often see clients with growing pains, and scalability challenges as their site becomes more popular. This also makes sense. It wouldn't necessarily be a good use of time to tune a query for some page off in a remote corner of your site, that didn't receive
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