For efficient access to data in a table, DynamoDB creates and maintains indexes for the primary key attributes. You can also create one or more secondary indexes on a table.
Can query the secondary index just as you would query a table. Secondary indexes are also specified with a partition key and a sort key.
Amazon Elastic File System (Amazon EFS) is a simple, scalable file storage for use with Amazon EC2 instances in the AWS Cloud. With Amazon EFS, storage capacity is elastic, growing and shrinking automatically as you add and remove files.
Quick updates on policies and features that was not discussed in other pages.
AWS will use commercially reasonable efforts to make Amazon EC2 and Amazon EBS each available with a Monthly Uptime Percentage (defined below) of at least 99.95%.
Amazon EC2 can be used with various pricing options such as on-demand, reserved, spot and dedicated server.
Pay fixed rate per hour without any commitment.
Suitable for applications that are:
Short term and cannot be interrupted.
Developed and tested on EC2 for first time.
With Amazon EBS, you can use any of the standard RAID configurations that you can use with a traditional bare metal server, as long as that particular RAID configuration is supported by the operating system for your instance. This is because all RAID is accomplished at the software level.
EBS provides following volume types:
General Purpose SSD (gp2)
General purposes. Balances price and performance.
Ratio of 3 IOPS per GB upto 10,000 IOPS.
Burst upto 3000 IOPS for volumes under 1GB.
can store up to 16 TB
Provisioned IOPS SSD (io1)
Amazon Elastic Block Store (EBS) provides persistent block storage volumes for use with Amazon EC2 instances.
Each EBS volume is automatically replicated within its Availability Zone to protect you from component failure.
With EBS, you can scale your usage up or down within minutes.
EBS is designed for application workloads that benefit from fine tuning for performance, cost and capacity.
Storage for the root device of an EC2 instance can be either Instance Store (ephemeral storage) or EBS backed volumes.
Ephemeral disk is a temporary storage that is added to your instance and is not persistant.
EBS volume is a durable, block-level storage device that you can attach to a single EC2 instance.
Root device type of an AMI is displayed on the AMI selection page.
DynamoDB Auto Scaling automatically scales up or down provisioned read and write capacity of a DynamoDB table or a global secondary index, as application requests increase or decrease.
There are no additional cost to using Auto Scaling, beyond what you already pay for DynamoDB and CloudWatch alarms.
Auto Scaling Benefits:
Eliminates the guesswork involved in provisioning adequate capacity when creating new tables
Will add errors and exceptions that I come across here.
The number of concurrent table requests (cumulative number of tables in the CREATING, DELETING or UPDATING state) exceeds the maximum allowed of 10.
Also, for tables with secondary indexes, only one of those tables can be in the CREATING state at any point in time. Do not attempt to create more than one such table simultaneously.
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CloudMaterials is my blog to share notes and learning materials on Cloud and Data Analytics. My current focus is on Microsoft Azure and Amazon Web Services (AWS).
I like to write and I try to document what I learn to share with others. I believe that knowledge is useless unless you share it; the more you share, the more you learn.
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