database runtime_error ai_generated true

MongoServerError: Cannot update system index 'system.indexes'

ID: database/mongodb-cannot-update-system-index

Also available as: JSON · Markdown · 中文
92%Fix Rate
88%Confidence
1Evidence
2023-11-20First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
MongoDB 5.0 active — — —
MongoDB 6.0 active — — —
MongoDB 7.0 active — — —

Root Cause

An attempt was made to directly modify a system collection (like system.indexes) using a write operation, which is forbidden in MongoDB for security and consistency reasons.

generic

中文

尝试使用写操作直接修改系统集合（如 system.indexes），MongoDB 出于安全性和一致性原因禁止这样做。

Official Documentation

https://www.mongodb.com/docs/manual/reference/method/db.createCollection/#std-label-create-collection-system-collections

Workarounds

  1. 95% success Use the proper MongoDB command to manage indexes, such as createIndex() or dropIndex(), which handle system collection updates internally: db.myCollection.createIndex({ field: 1 }) 
    Use the proper MongoDB command to manage indexes, such as createIndex() or dropIndex(), which handle system collection updates internally:
db.myCollection.createIndex({ field: 1 })
  2. 85% success If you need to modify system collection behavior, use documented features like the 'system.profile' collection via db.setProfilingLevel() instead of direct writes. 
    If you need to modify system collection behavior, use documented features like the 'system.profile' collection via db.setProfilingLevel() instead of direct writes.

中文步骤

  1. Use the proper MongoDB command to manage indexes, such as createIndex() or dropIndex(), which handle system collection updates internally:
db.myCollection.createIndex({ field: 1 })
  2. If you need to modify system collection behavior, use documented features like the 'system.profile' collection via db.setProfilingLevel() instead of direct writes.

Dead Ends

Common approaches that don't work:

  1. Trying to drop and recreate the system.indexes collection 95% fail

    MongoDB prevents dropping system collections; this operation will fail with a similar error.

  2. Using db.runCommand({collMod: 'system.indexes', ...}) 90% fail

    collMod is not supported for system collections; MongoDB returns an error.