[CSHARP-3086] Hidden Indexes Created: 04/May/20  Updated: 28/Oct/23  Resolved: 18/Sep/20

Status: Closed
Project: C# Driver
Component/s: None
Affects Version/s: None
Fix Version/s: 2.12.0

Type: Improvement Priority: Major - P3
Reporter: Backlog - Core Eng Program Management Team Assignee: Dmitry Lukyanov (Inactive)
Resolution: Fixed Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Depends
is depended on by DRIVERS-816 Hidden Indexes Closed

 Description   

Description of Drivers Ticket:

Downstream Change Summary

TBD when the project completes.

Description of Linked Ticket

Epic Summary

Summary

This project implements functionality to allow indexes to be hidden from the query planner.

Motivation

As MongoDB users evolve schemas and tune performance, they are often in a position where dropping an index could improve query performance and reduce collection overhead. However, dropping an index comes with the risk that an application or script may depend on an index for acceptable performance and recreating can take substantial time.

Allowing users to hide an index provides the opportunity to evaluate impact on user workloads. Restoring the index can then be done quickly, without having to undergo the time and expense of a full index build.

Additionally, adding an index can cause a negative change in performance, if the query planner starts using the new index over a preferable existing index. Creating an index that is hidden on build completion allows users to make it visible at a suitable time for evaluation.

Hiding an index only allows for plan selection evaluation and does not reduce the cost of maintenance. Index removal will still be required to reclaim disk space and improve write performance.

Cast of Characters

  • Product Owner: Katya Kamenieva
  • Project Lead: James Wahlin
  • Program Manager: Craig Homa

Documentation

Scope Document
Technical Design Document

 

Specs commit: https://github.com/mongodb/specifications/commit/fafb0076e3c2ee8c35497bd1260c1cfc672c4919
See DRIVERS-816 for updated details.



 Comments   
Comment by Githook User [ 18/Sep/20 ]

Author:

{'name': 'DmitryLukyanov', 'email': 'dmitry.lukyanov@mongodb.com', 'username': 'DmitryLukyanov'}

Message: CSHARP-3086: Hidden Indexes.
Branch: master
https://github.com/mongodb/mongo-csharp-driver/commit/f7a8692e216fdb4491dd9bba9045b6d9968b0562

Generated at Wed Feb 07 21:44:19 UTC 2024 using Jira 9.7.1#970001-sha1:2222b88b221c4928ef0de3161136cc90c8356a66.