Charles Lamb's Blog

[The following is a repost of the 12/14/05 Sleepycat blog entry.]

In Unsorted Retrieval in JE I mentioned that JE 2.1 would use a new Sorted LSN Tree Walker technology to improve performance for Database.truncate() and Database.remove(). I also suggested that JE might also eventually use this for improving Database.preload()
performance. The changes that make preload use this technique were just
checked in so it will in fact be released in JE 2.1. The performance
improvement for a cold-cache preload (i.e. cold OS file system cache)
is on the order of about 50% for a database that was created in random
order (YMMV). Database.preload() will also allow optionally loading LN's (the data portion of the B+Tree). Finally, Database.preload()
will return stats about the number and type of nodes that were loaded
as well as whether the operation completed successfully or was
terminated due to filling the cache or exceeding the user-designated
time limit.