MongoDB very slow deletes

Question

I\'ve got a small replica set of three mongod servers (16GB RAM each, at least 4 CPU cores and real HDDs) and one dedicated arbiter. The replicated data has about 100,000,0

Answer 1

Another suggestion that may not fit you, but it was optimal solution for me:

1. drop indeces from collection
2. iterate over all entries of collection and store id's of records to delete into memory array
3. each time array is big enough (for me it was 10K records), i removed these records by ids
4. rebuild indeces

It is the fastest way, but it requires stopping the system, which was suitable for me.