问题
I've been looking around for best practices when setting up your database on the cloud but it still isn't clear to me which of the following solutions should we be going for?
- Amazon RDS Aurora
- Amazon RDS MySQL
- MySQL on EC2 instances
I see Amazon Aurora being marketed as the better alternative however after some research it doesn't seem like people are using it. Is there a problem with it?
回答1:
You should benchmark Aurora carefully before you consider it. Launch an instance and set up a test instance of your application and your database. Generate as high of load as you can. I did at my last company, and I found that despite Amazon's claims of high performance, Aurora failed spectacularly. Two orders of magnitude slower than RDS. Our app had a high rate of write traffic.
Our conclusion: if you have secondary indexes and have high write traffic, Aurora is not suitable. I bet it's good for read-only traffic though.
(Edit: the testing I'm describing was done in Q1 of 2017. As with most AWS services, I expect Aurora to improve over time. Amazon has an explicit strategy of "Release ideas at 70% and then iterate." From this, we should conclude that a new product from AWS is worth testing, but probably not production-ready for at least a few years after it's introduced).
At that company, I recommended RDS. They had no dedicated DBA staff, and the automation that RDS gives you for DB operations like upgrades and backups was very helpful. You sacrifice a little bit of flexibility on tuning options, but that shouldn't be a problem.
The worst inconvenience of RDS is that you can't have a MySQL user with SUPER privilege, but RDS provides stored procs for most common tasks you would need SUPER privilege for.
I compared a multi-AZ RDS instance versus a replica set of EC2 instances, managed by Orchestrator. Because Orchestrator requires three nodes so you can have quorum, RDS was the clear winner on cost here, as well as ease of setup and operations.
回答2:
I don't use Aurora personally, but I can HIGHLY recommend RDS over running your own on EC2. Having the failover happen automatically and also the backups is just worth every penny. Especially since RDS isn't that much more expensive.
Aurara looks really good on paper, but the more flexible choice of instances has kept me at PostGreSQL until now. We're looking at migrating to Aurora though, mainly because of the autoscaling storage provisioning and the higher performance.
回答3:
AWS RDS is the managed database solution which provides support for multiple database options Amazon Aurora, PostgreSQL, MySQL, MariaDB, Oracle, and Microsoft SQL Server. When you go with RDS it will provide inbuilt configuration options such as.
- Database Replication for High Availability
- Read Replicas for Scalability
- Backups & Restore
- Operating system and software patches & etc.
This simplifies the overhead of database administration. However the flexibility is limited to the RDS offerings.
Alternatively if you host your database in EC2 instance, you can install the required versions of the database engines, install needed extensions & etc. which provides more flexibility but also requires expertise & adds administration overhead.
When you consider Amazon Aurora in RDS, it differs from the rest of the engines because, its new and fully implemented by Amazon from ground up and offers higher performance, reliability out of the box (As marketed by Amazon) with reasonable pricing. However one limitation with Aurora is that its not included in AWS free-tier, where the smallest instance type it supports is "small".
Note: Some of the features offered by RDS and cost differs, based on the database option you select.
来源：https://stackoverflow.com/questions/46401830/amazon-rds-aurora-vs-rds-mysql-vs-mysql-on-ec2