The maximum number of Guaranteed messages that Solace routers can queue at one time for delivery will be cumulatively reduced by the following factors:
- the number of messages that provisioned endpoints receive—If a single published message is queued for delivery on n endpoints, that counts as n messages queued for delivery, even though only one copy of the message is stored in either the ADB or external disk storage array.
- whether data from the router is being replicated—When the Replication facility is used, a copy of a message in the Replication queue counts as another message queued for delivery. That is, if a message is queued for delivery on n endpoints, and it is to be replicated, that counts as n +1 messages queued for delivery.
- whether the router is processing transactions—When transactions are used, the router has to maintain extra information for each message in a transaction until the transaction is committed or rolled back.
- whether there are provisioned endpoints configured to respect published messages’ TTL expiry times—When an endpoint respects a message’s TTL, the TTL is recorded and maintained until the message is consumed or discarded.