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Describe Limits

dynamodb_describe_limits R Documentation

Returns the current provisioned-capacity quotas for your Amazon Web Services account in a Region, both for the Region as a whole and for any one DynamoDB table that you create there

Description

Returns the current provisioned-capacity quotas for your Amazon Web Services account in a Region, both for the Region as a whole and for any one DynamoDB table that you create there.

When you establish an Amazon Web Services account, the account has initial quotas on the maximum read capacity units and write capacity units that you can provision across all of your DynamoDB tables in a given Region. Also, there are per-table quotas that apply when you create a table there. For more information, see Service, Account, and Table Quotas page in the Amazon DynamoDB Developer Guide.

Although you can increase these quotas by filing a case at Amazon Web Services Support Center, obtaining the increase is not instantaneous. The describe_limits action lets you write code to compare the capacity you are currently using to those quotas imposed by your account so that you have enough time to apply for an increase before you hit a quota.

For example, you could use one of the Amazon Web Services SDKs to do the following:

  1. Call describe_limits for a particular Region to obtain your current account quotas on provisioned capacity there.

  2. Create a variable to hold the aggregate read capacity units provisioned for all your tables in that Region, and one to hold the aggregate write capacity units. Zero them both.

  3. Call list_tables to obtain a list of all your DynamoDB tables.

  4. For each table name listed by list_tables, do the following:

    • Call describe_table with the table name.

    • Use the data returned by describe_table to add the read capacity units and write capacity units provisioned for the table itself to your variables.

    • If the table has one or more global secondary indexes (GSIs), loop over these GSIs and add their provisioned capacity values to your variables as well.

  5. Report the account quotas for that Region returned by describe_limits, along with the total current provisioned capacity levels you have calculated.

This will let you see whether you are getting close to your account-level quotas.

The per-table quotas apply only when you are creating a new table. They restrict the sum of the provisioned capacity of the new table itself and all its global secondary indexes.

For existing tables and their GSIs, DynamoDB doesn't let you increase provisioned capacity extremely rapidly, but the only quota that applies is that the aggregate provisioned capacity over all your tables and GSIs cannot exceed either of the per-account quotas.

describe_limits should only be called periodically. You can expect throttling errors if you call it more than once in a minute.

The describe_limits Request element has no content.

Usage

dynamodb_describe_limits()

Value

A list with the following syntax: 

list(
  AccountMaxReadCapacityUnits = 123,
  AccountMaxWriteCapacityUnits = 123,
  TableMaxReadCapacityUnits = 123,
  TableMaxWriteCapacityUnits = 123
)

Request syntax

svc$describe_limits()

Examples

## Not run: 
# The following example returns the maximum read and write capacity units
# per table, and for the AWS account, in the current AWS region.
svc$describe_limits()

## End(Not run)