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<b>Purge delay. </b>The delay you specify in these fields determines how long the server keeps replication state information in the database before it is purged. A longer time means that the risk of needing to perform a replication re-initialization is lower, but you will need more disk space to store the extra data and more memory to cache the extra data. A shorter time means the risk of needing to perform a replication re-initializtion is higher, but you will need less disk space and memory. Check the Never checkbox if you want to save this information indefinitely.