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

Fauna accounts created after August 21, 2024 must use FQL v10. These accounts will not be able to run FQL v4 queries or access the v4 Dashboard.

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

List all child databases

Reading or writing database documents requires an admin key.

Problem

You need a list of all child databases within the current database.

Solution

Use the Databases function combined with the Paginate function:

adminClient.query(
  q.Paginate(q.Databases())
)
.then((ret) => console.log(ret))
.catch((err) => console.error(
  'Error: [%s] %s: %s',
  err.name,
  err.message,
  err.errors()[0].description,
))

{
  data: [ Database("prydain"), Database("child_db"), Database("annuvin") ]
}

result = adminClient.query(
  q.paginate(q.databases())
)
print(result)

{'data': [Ref(id=prydain, collection=Ref(id=databases)), Ref(id=child_db, collection=Ref(id=databases)), Ref(id=annuvin, collection=Ref(id=databases))]}

result, err := adminClient.Query(
	f.Paginate(f.Databases()))

if err != nil {
	fmt.Fprintln(os.Stderr, err)
} else {
	fmt.Println(result)
}

map[data:[{prydain 0xc0000924b0 0xc0000924b0 <nil>} {child_db 0xc0000925a0 0xc0000925a0 <nil>} {annuvin 0xc000092690 0xc000092690 <nil>}]]

try
{
    Value result = await client.Query(
        Paginate(Databases())
    );
    Console.WriteLine(result);
}
catch (Exception e)
{
    Console.WriteLine($"ERROR: {e.Message}");
}

ObjectV(data: Arr(RefV(id = "prydain", collection = RefV(id = "databases")), RefV(id = "child_db", collection = RefV(id = "databases")), RefV(id = "annuvin", collection = RefV(id = "databases"))))

System.out.println(
        adminClient.query(
            Paginate(Databases())
        ).get());

{data: [ref(id = "prydain", collection = ref(id = "databases")), ref(id = "child_db", collection = ref(id = "databases")), ref(id = "annuvin", collection = ref(id = "databases"))]}

Paginate(Databases())

{
  data: [ Database("prydain"), Database("child_db"), Database("annuvin") ]
}

Query metrics:

bytesIn: 31
bytesOut: 225
computeOps: 1
readOps: 8
writeOps: 0
readBytes: 334
writeBytes: 0
queryTime: 24ms
retries: 0

Discussion

The Paginate function defaults to returning up to 64 databases per page. If your database contains more than 64 databases, you can use the size parameter to retrieve up to 100,000 databases at once.

Is this article helpful?

Tell Fauna how the article can be improved:
Visit Fauna's forums or email docs@fauna.com

Thank you for your feedback!