database schema for messaging system

OverviewOne of the previous blogs has written about server logins, server roles, database users, database roles, and some knowledge of the theory, so you can look at this blog: logins, server roles, user names, and database roles. This blog focus on the operation.Database Schema in the specific operation, the first to

database where the old user resides, but the pressure on the new user's partitioned database is small. Mapping Relationship partitions: A partition mapping relationship is created for each possible result of the partitioned index field, which is very large and needs to be written to the database. For example, when an application needs to know the content of a us

partitions:A partition mapping relationship is created for each possible result of the partitioned index field, which is very large and needs to be written to the database. For example, when an application needs to know the content of a user_id 10 user's blog in that partition, it must query the database for the answer, and of course we can use caching to improve performance.This method preserves the parti

The three-level structure of the database system refers to that the database system consists of three levels: mode, external mode, and internal mode. (1) The mode is also called the logical mode or conceptual mode. It is the logical structure and feature description of all data in the

When I register the sqlserver2000 script generated in the sql2005 database in the query Analyzer of the remote database and run the website, an error is found: The 'System. web. security. sqlroleprovider 'requires a database schema compatible with

used to model or create a logical structure using which data can be stored in a database. Technically speaking, a database schema is the underlying structure described by and supported by the database management system that is used to store records.Generally, a

In the process of learning SQL, you will encounter a concept that confused your schema. In fact, a schema is a collection of database objects that contain objects such as tables, views, stored procedures, indexes, and so on. In order to distinguish different sets, it is necessary to give different names to each set, by default a user corresponds to a set, the use

In the process of learning SQL, you will encounter a concept that confused your schema. In fact, a schema is a collection of database objects that contain objects such as tables, views, stored procedures, indexes, and so on. In order to distinguish different sets, it is necessary to give different names to each set, by default a user corresponds to a set, the use

) and low latency (5ms at 99%). Pulsar 2.1 Enriches the properties of "Stream Native" beyond the message system, such as Schema support, hierarchical storage, state functions, etc...===========Today Apache Pulsar officially released the 2.1.0 version! The release from version 2.0 is less than two months apart. In this short two-month period, the community has contributed very rapidly. The 2.1 release c

connected users heartbeat needs to maintain, assuming a heartbeat 300s once, heartbeat package needs 1w TPS per second. Unicast and multicast data forwarding, broadcast data forwarding, itself also to respond to internal RPC calls, 300w long connection, GC pressure, internal interface response delay can be guaranteed stability. These are concentrated in one instance, and usability is a challenge. Therefore, the online single instance will not hold a high long connection, the actual situation sh

Mobile real-time communication system practice2016-04-19 Liaojin iOS development exploration With information highly developed today, IM has basically become the standard for a social application. This paper will discuss the technology selection and key points of mobile instant communication system from the perspective of a mobile developer.1 demand for Instant messagin