FQL v4 will be decommissioned on June 30, 2025. Ensure that you complete your migration from FQL v4 to FQL v10 by that date.

For more details, see the v4 EOL announcement and migration guide. Contact support@fauna.com with any questions.


Fauna is a shared, globally accessible database service. To optimize query performance and share resources in a fair manner, the following global limits are in place. See the Plan details documentation for the throughput limits of each of the Fauna plans.

Constraint Limit

Document size

8 MB/document

Query size

16 MB/query

Transaction size

16 MB/transaction


Default query execution time when no timeout is defined

2 minutes

Maximum query execution time even when a timeout is defined

10 minutes

Concurrent index builds

500 per account per region group

Index builds, for collections with more than 128 documents, are handled by a background task. The limit prevents an excessive number of indexes that must be built simultaneously.

Fauna returns an HTTP 429 error When this limit is exceeded and the transaction is aborted.

Index entries

64 KB

An index entry includes its terms and values fields, and must not exceed 64 KB bytes.

Protective service limit

Fauna returns HTTP status code 429 if a query causes read, write, or compute ops to generate excessive traffic that exceeds protective service limits. See Plan throughput limits.

As a document database, Fauna is not recommended as a storage solution for arbitrary binary blob data, such as images and PDFs.

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