Skip to content

Latest commit

 

History

History
28 lines (18 loc) · 1 KB

db_indexes.md

File metadata and controls

28 lines (18 loc) · 1 KB

Recommended database indexes

STH uses one database per service (name pattern: sth_<service>) with two collections:

  • Raw data collection (name pattern: sth_/<subserviceName>)
  • Aggregated data collection (name pattern: sth_/<subserviceName>.aggr)

Indexes in the raw data collection

It is recommended to create the following index in this collection:

{entityId: 1, entityType: 1, attrName: 1, recvTime: -1}

The performance difference can be dramatic for large sets of data. For instance, for a collection with around ~3000000 query execution time can drop from 3 seconds to 1 millisecond.

Indexes in the aggregated data collection

It is recommended to create the following index in this collection:

{ "_id.entityId": 1, "_id.entityType": 1, "_id.attrName": 1, "_id.resolution": 1, "_id.origin": 1 }

The performance difference can be dramatic for large sets of data. For instance, for a collection with around ~6000000 query execution time can drop from 28 seconds to 20 millisecond.