Sync Limits

In order to guarantee good quality of service across for all your customers across all your apps, Sync applies rate limits to the actions (reads and writes) taken by your code in the running app. Note that state fanout—the delivery of realtime updates to your app when it is subscribed to a Sync object—is neither a read action nor a write action, and therefore we do not limit the rate of delivery to subscribers.

The following tables summarize the various rate limits that apply.

Connection Limits

Limited Quantity	Prescribed Limit	注釈
Number of Standing Connections	up to 7,000 per Twilio Account	This applies across all subaccounts. Contact sales for more information or to request an override.
Rate of Connection Establishment (new or re-established)	up to 50/s per Twilio Account	This applies across all subaccounts. Contact sales for more information or to request an override.
Rate of Upstream Requests	up to 20,000/s per Twilio Account up to 500/s per connection	This applies across all subaccounts. Contact sales for more information or to request an override.

Sync Activity Limits

Limited Quantity	Prescribed Limit	注釈
Rate of Object Writes	up to 20/s per object burst window: 10s	An object write is an explicit request in your code to change a value stored in Sync. The limit applies at the top level of each Document, Map, and List, e.g. updating any item in a Map still counts towards the containing Map's write rate. Fanout to subscribers is not rate-limited. If a write is accepted, all online subscribers will receive a state update and their number is inconsequential to the object's read or write usage. Objects larger than 1kb are rate-limited more aggressively. The most strict rate limit, applicable for payloads 10kb and larger, is 2 writes/s sustained.
Rate of Object Reads	up to 20/s per object burst window: 10s	Object reads are effectively GET requests for Sync data. These usually occur when initializing your Sync app. Fanout of state updates to an online subscriber does not count as a read. The limit applies at the top level of each Document, Map, and List. When requesting List or Map items en masse, each requested page counts as one read.
Rate of Stream Messages	up to 30/s per stream burst window: 10s	Fanout to subscribers is not rate-limited. If a message is accepted, delivery will be scheduled for all subscribers. Delivery is not guaranteed, and occurs independently of the message's acceptance from the sender. If a receiver fails to accept a message within a few seconds of acceptance, Sync will silently drop that message for that subscriber. Messages larger than 1kb will be rate-limited more aggressively. The most strict rate limit, applicable for payloads larger than 3kb, is 7 messages/s sustained.
Rate of Live Queries	up to 200/s per index per service instance up to 20/s per index per client identity burst window: 10s	Establishing a new Live Query fetches a dataset with filters applied and is rate controlled. Live Query global rate control applies per individual index within a single Sync service instance. Live Query client rate control applies per client identity established by Sync SDK.
Number of Sync Objects	無制限	You can create at most 20 objects per second, per Sync service. Important to mention, delete operations are counted into 20 objects per second limit. Deleting objects is free if this action is triggered by TTL, and not subject to any rate limit.

Sync Payload Limits

Limited Quantity	Prescribed Limit	注釈
Size of Document payload	16 KiB	Sync Documents may contain payloads up to 16 KiB of valid JSON serialized to a UTF-8 string.
Size of List Item payload	16 KiB	Sync Lists may contain Items with payloads up to 16 KiB of valid JSON serialized to a UTF-8 string.
Number of Items in the List	1,000,000	Sync Lists should not contain more than a million of items.
Size of Map Item payload	16 KiB	Sync Maps may contain Items with payloads up to 16 KiB of valid JSON serialized to a UTF-8 string.
Number of Items in the Map	1,000,000	Sync Maps should not contain more than a million of items.
Size of Stream Message	4 KiB	Sync Message Streams may deliver payloads up to 4 KiB of valid JSON serialized to a UTF-8 string.
Length of Unique Name	320 characters	Unique names assigned to Documents, Lists, Maps, Message Streams may contain up to 320 characters (UTF-8).
Length of Identity	256 characters	Client identity may contain up to 256 characters (UTF-8).

Sync Insights Client Limits

(Currently for Flex customers only)

Limited Quantity	Prescribed Limit	注釈
Number of active LiveQueries per SDK client	2000	The number of active Sync LiveQueries initiated and tracked by a single SDK client instance must not exceed 2000.
Number of operators in query expression	30	Query expression may contain any combination of the following operators: `and`, `or`, `in`, `eq`, `not_in`, `not_eq`, `contains`, however overall number of operators in query expression must be less than 30.
Array size in query expression	30	Any array within query expression must contain less than 30 elements.

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Connection Limits

Sync Activity Limits

Sync Payload Limits

Sync Insights Client Limits

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