Limits

Maximum number of databases per project

100

You can contact support to request an increase to this limit.

Maximum number of customer-managed encryption keys (CMEK) databases per project

0

By default the quota is 0 because this feature is behind an allowlist. You can request to increase the quota by filling in the CMEK access request form .

Maximum API request size.

This limit applies when Datastore mode is used outside of Google App Engine. If Datastore mode is used from App Engine, the limit depends on the client library that is used.

10 MiB

Maximum size for a transaction

10 MiB

Maximum size for an entity

Maximum number of property transformations that can be performed on a single entity in a Commit operation or in a transaction.

For array transforms like "appendMissingElements" , each array element counts towards the limit.

500

Maximum size for an entity key

6 KiB

Maximum depth of nested entity values

20

Maximum number of keys allowed for a Lookup operation in the Datastore API

1,000

Maximum size of an indexed string property's UTF-8 encoding

1,500 bytes

Maximum size for an unindexed property

Maximum sum of the sizes of an entity's composite index entries

2 MiB

Maximum number of composite indexes for a database

• 200 when you have not enabled billing for your Google Cloud project.

  If you need more quota, you must enable billing for your Google Cloud project.

• 1000 when you enable billing for your Google Cloud project.

  You can contact support to request an increase to this limit.

Maximum sum of the following for an entity:

• the number of indexed property values
• the number of composite index entries

20,000

Maximum number of properties in a composite index

2 MiB

Maximum total number of both export and import requests for a project allowed per minute

20

Maximum number of concurrent exports and imports

50

Maximum number of entity filters for export and import requests

When the export or import request specifies an entity_filter , each combination of filtered kind and namespace counts as a separate filter towards this limit. For example:

A request with kinds=['foo', 'bar'] and namespace_ids=['', 'ns1']
results in 4 filters towards this limit: [('', 'foo'), ('', 'bar'), ('ns1', 'foo'), ('ns1', 'bar')]

100

Maximum number of time-to-live (TTL) policies allowed per database.

1000