mongodb migrate data

This article describes how to connect to mongodb using python, including data insertion, Data Update, data query, and data deletion. Database configuration class MongoDBConn. py The code is as follows: # Encoding = UTF-8'''Mongo Conn connection class'''Import pymongoClass

Optime: Read Oplog.rs collection. The last time the instance was changed.MongoDB uses lastheartbeat for automatic transfer.The Mongod instance sends a heartbeat packet to the other members every two seconds, and the member's state is judged by the health of the member returned in Rs.status (). If the primary node is unavailable, then all secondary nodes in the replication set will trigger an election operation. Select the new primary node. If there are multiple secondary nodes, the node that ha

Tags: man multiple create promotion information Oct type accelerated cleanupServices run on the line will generate a large number of running and access logs, the log will contain some errors, warnings, and user behavior information, usually the service will be in the form of text log information, so readable, convenient for daily positioning problems, but when a large number of logs, to dig out a large number of logs of valuable content, Further storage and analysis of the

the rankings, you can see that the MongoDB database stands out from many RDBMS (relational databases), has become the fifth place, and is still rising.　　If the database analogy to the adult class, then MongoDB can be said to be a prodigy, only 5-year-old he alone challenged a group of uncle-level characters, and according to the pace of development in recent years, he is about to surpass Pgsql to become th

knowledge site Db-engines last month.　　From the rankings, you can see that the MongoDB database stands out from many RDBMS (relational databases), has become the fifth place, and is still rising.　　If the database analogy to the adult class, then MongoDB can be said to be a prodigy, only 5-year-old he alone challenged a group of uncle-level characters, and according to the pace of development in recent year

First, related codeDatabase Configuration Class mongodbconn.py Copy Code code as follows: #encoding =utf-8 ''' Mongo Conn Connection Class ''' Import Pymongo Class Dbconn: conn = None Servers = "mongodb://localhost:27017" def connect (self): Self.conn = Pymongo. Connection (Self.servers) def close (self): Return Self.conn.disconnect () def getconn (self): Return Self.conn Mong

For a long time in the past, relational databases (relational database Management System) have been the most mainstream database solution, He uses things and relationships in the real world to explain the abstract data architecture in the database. However, in the explosive development of information technology today, big data has become the cloud computing, the Internet of things after the new technologica

[Spring Data MongoDB] learning notes -- modify template insertion and modification operations, mongodb integrates spring Insert operation: Directly give an example Import static org. springframework. data. mongodb. core. query. Criteria. where; import static org. springframe

[Spring Data MongoDB] learning notes-awesome MongoTemplate and mongodb integration with spring The operation template is an interface between the database and the Code. All operations on the database are in it. Note: Producer template is thread-safe. Using template implements interface operations. It is generally recommended to use operations for related operatio