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

Compute operations


Default query execution time even without a timeout

2 minutes

Maximum query execution time even with a timeout

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

64k bytes

An index entry includes terms and values fields and must not exceed 64k bytes.

Pagination size

1 to 100,000

Minimum and maximum number of paginated values returned by the paginate() method.

UDF recursion limit

User-defined function (UDF) recursion is limited to a depth of 2048 calls.

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.

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