[Xapian-discuss] How to rebuild database from scratch without preventing searches

[William Crawford]

I have a process which wants to recreate a database nightly (it takes ~10 
minutes, and is much faster than trying to figure out what to remove and add 
from the existing contents). However, opening the database with the flag 
DB_CREATE_OR_OVERWRITE destroys the existing database and prevents searches 
from taking place until the rebuild process is finished.

We'd like to rebuild the database while still allowing searches to proceed, 
naturally ... what's the, uh, "recommended" way to do this? Build into a 
temporary copy and move a symlink? Is there any way to clear the contents and 
start over without removing the existing version so readers can continue to 
work (other than scanning through all the existing documents and removing them 
...)?