General requirements and limits

Browser requirements

Supported browser	Minimum version	Browser update link
Chrome	69	Update Google Chrome
Edge	79	Update to the new Microsoft Edge
Firefox	62	Update Firefox to the latest release
Safari	12.1	Update to the latest version of Safari

Supported browser

Minimum version

Browser update link

Chrome

Update Google Chrome

Edge

Update to the new Microsoft Edge

Firefox

Update Firefox to the latest release

Safari

12.1

Update to the latest version of Safari

Global limits

To optimize query performance and share resources in a fair manner, the following global limits are in place.

Users are responsible for working within the limits. Fauna is intended for operational workloads and attempts to run any queries as quickly as possible.

See the Plan details documentation for the throughput limits of individual Fauna plans.

Constraint Limit

Constraint	Limit
Document size	8 MB per document. Document size is the size of document once encoded. Fauna encodes documents in a binary format that’s smaller than raw JSON. FSL schema are stored as documents and are subject to this limit.
Query size	16 MB per query Query size is the size of the HTTP request payload.
Transaction size	16 MB per transaction Transaction size is the total size of the transaction’s write. Read-only queries are not subject to this limit. Uses the size of binary-encoded document.
Compute operations	12,000 per transaction
Default query execution time even without a timeout	2 minutes
Maximum query execution time even with a timeout	10 minutes
Maximum number of collections per database	1,024
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. If a transaction exceeds this limit, Fauna aborts the transaction and returns a 429 HTTP status code.
Index entries	64 KB An index entry includes `terms` and `values` fields and must not exceed 64 KB.
Pagination size range	1 to 16000 (inclusive) Minimum and maximum number of paginated values returned by the `set.pageSize()` or `set.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.
Array size	16,000 elements per Array.
String size	16,777,216 characters
`Array.sequence()` range limit	When calling `Array.sequence()`, the difference between the start and end values can’t exceed 16,000.

Document size

8 MB per document.

Document size is the size of document once encoded. Fauna encodes documents in a binary format that’s smaller than raw JSON.

FSL schema are stored as documents and are subject to this limit.

Query size

16 MB per query

Query size is the size of the HTTP request payload.

Transaction size

16 MB per transaction

Transaction size is the total size of the transaction’s write. Read-only queries are not subject to this limit. Uses the size of binary-encoded document.

Compute operations

12,000 per transaction

Default query execution time even without a timeout

2 minutes

Maximum query execution time even with a timeout

10 minutes

Maximum number of collections per database

1,024

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.

If a transaction exceeds this limit, Fauna aborts the transaction and returns a 429 HTTP status code.

Index entries

64 KB

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

Pagination size range

1 to 16000 (inclusive)

Minimum and maximum number of paginated values returned by the set.pageSize() or set.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.

Array size

16,000 elements per Array.

String size

16,777,216 characters

Array.sequence() range limit

When calling Array.sequence(), the difference between the start and end values can’t exceed 16,000.

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