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# d4m — What's different from MongoDB
Default credentials: admin / password on admin db, SCRAM-SHA-256, role root
Users scoped to creation DB → use ?authSource=admin in URI if user is in admin
Default user re-salted on every restart → reconnect fresh
maxWireVersion: 21 (MongoDB 8.0+)
hello/isMaster: must echo clientConnectionId back, else GUI tools break on reconnect
Logs: ./logs/d4m-debug.log (hardcoded)
pymongo 4.17+: C-level encoder strips $-prefixed keys in arrays → use mongosh/raw BSON for aggregates
# Not implemented — avoid these:
Transactions, change streams, replica sets, sharding, sessions
TTL/text/geo indexes, $where, mapReduce, server-side JS
$bucket, $bucketAuto, $graphLookup, $geoNear, $merge