Since MongoDB 5.0, the drop command and the db.collection.drop() method will return an error if you attempt to drop a collection in the admin database or the config database from a mongos. Connect to the config
Starting in MongoDB 4.0.2, dropping a collection deletes its associated zone/tag ranges. If you try to drop a collection in the admin database or the config database from amongossince MongoDB 5.0, the drop command and thedb.collection.drop()function will produce an error. Instead, connect...
Now that we have chunked up our reference documents, let’s embed and ingest them into MongoDB Atlas to build a knowledge base (vector store) for our RAG application. Since we want to evaluate two embedding models for the retriever, we will create separate vector stores (collections) using ...
Query Profiler Query Targeting Real-Time Performance Panel Replication Lag Replication Oplog Window rs.printReplicationInfo() rs.printSecondaryReplicationInfo() rs.status() Scan And Order System Memory Experience the benefits of using MongoDB, the premier NoSQL database, on the cloud. ...
1. Tailing the MongoDB Oplog At the heart of MongoDB’s native replication system is theoplog (operation log), a capped collection that logs every write operation—insert, update, and delete—performed on your MongoDB cluster. By tailing the oplog, you can stream CDC events from the source...
In contrast, the backup and restore operations create or use MongoDB-specific binary data, which preserves not only the consistency and integrity of your data but also its specific MongoDB attributes. Thus, for migration, it's usually preferable to use backup and restore as long as the...
// other fields. // Run this in the MongoDB shell [db.<collection1>, db.<collection2>].forEach(function(collection) { collection.find({}).forEach(function(x) { delete x._id; collection.save(x); }); });
Read more DigitalOcean vs. AWS Lightsail: Which Cloud Platform is Right for You? Read more New Partnerships after query execution on Mongodb shell, i want to see the query execution time on mongodb shell. Please help me… This work is licensed under a Creative Commons Attribution-NonCommercial...
How a replica set in MongoDB works,ApsaraDB for MongoDB:A replica set in ApsaraDB for MongoDB is a group of mongod processes and contains a primary node and multiple secondary nodes. MongoDB drivers write data to the primary node only. Then, data is sync
public <T> int delete(Class<T> entityClass, String condition, Object[] params) 返回删除的记录个数 注意: 这些方法都需要事务,Service层标上@Transactional MongoDB目前还不支持事务 ■ 根据主键值查询一条记录 public <T> T find(Class<T> entityClass, Serializable entityid) ...