Clarify address-size and how to configure max-size-bytes for paging?

[Mohanavalli-A]

Hi Team,

We have the max-size-bytes configured as -1 in the address-setting and global-max-size as 1/5th of the broker xmx.
Recently we had a situation of DLQ with more messages, which caused paging of all addresses affecting broker performance. To avoid such situation, we want to configure max-size-bytes for DLQ with a lower value so that DLQ messages do not cause paging of other addresses. Can you clarify below

How is address size calculated?
When messages are sent to broker, are the messages present only in memory or they are also written to disk (before paging begins)?
Are only paged messages written to disk?
How is address size different from Queue persistent size?
Why is address size very less compared to Queue persistent size? How to calculate the max-size-bytes for a queue based on expected persistent size for the queue?
How to ensure memory is not unnecessary held by messages in DLQ/any custom error queue?

Thanks.

[brusdev]

@Mohanavalli-A those are questions for the Apache ActiveMQ Artemis users mailing list.