nosql acid database

the time, I later on the Internet access to more information, found that my understanding is only partial. (Even the author's understanding is wrong, such as the author of 2.1.5 The consistency of the simple understanding of the role of check constraints) in fact, the primary foreign KEY constraints, check constraints are the scope of database integrity (why is the integrity of the acid in the no longer?)

operations with SQL, which can be scaled horizontally.Typical representative of SQL database: SQL Server,oracle,my SQLTypical representative of a NoSQL database: Mongodb,redis1. SQL data exists in a specific structure of the table, NoSQL flexible, storage can be JSON, hash table and other ways2. The table and field st

Label:There have been widespread characterization of one of the major distinctions between NoSQL and traditional DBMSs by saying That's the former don ' t care for ACID semantics or that transactions aren ' t needed. This is a oversimplification to say the least. As long as the NoSQL system supports incremental updates by concurrent set of users (as opposed to on

Do a year's freshman year project, for relational database structure or some understand, sometimes still feel that the two-dimensional table is not very comfortable. After reading an article, there is a preliminary understanding of NoSQL (Https://keen.io/blog/53958349217/analytics-for-hackers-how-to-think-about-event-data). This article is written very well, indeed written out in the actual situation of the

Key-Value Store databaseTemporary: as memcached. The temporary key-value database stores the data in memory, which in two cases results in the loss of data, the first is the power outage, but the data content exceeds the memory size. The benefits of this treatment are very fast.Permanent type: such as Tokyo Tyrant, flare and RomaThe two are both types: Redis. Redis first data in memory, and then meet certain conditions (the default is 15 minutes more

Transaction is the core of relational database, and relational database has flourished in the past few decades, and its support to the transaction is inseparable. But the so-called Chengye, Shenya, with the explosion of data volume, especially in recent years, the rapid development of large data, relational database transactions become the Internet application of

Tags: relational data table NoSQL database L database Combat div operation Field Why NoSQL is produced: The fact that relational databases are not good at doing so is the reason why NoSQL is Born: Large number of data write operationsThe book is written "la

First, you need to define the concept of the transaction: a set of atomic SQL queries that, if the database engine succeeds in applying all the statements of the group query to the database, executes the group statement, or none of the statements are executed. Transactions have acid four characteristics, namely: Atomicity: A transaction is an indivisible minimum

Label:relational database acidI. Transactions Definition: The so-called transaction, which is a sequence of operations that are either executed or not executed, is an inseparable unit of work. Preparation: To illustrate the acid principle of transactions, we use bank accounts and money management cases (ATMs) for analysis. Create a database Create Table

In-depth analysis of NoSQL database distributed algorithms (graphic details), nosql text Although the NoSQL movement has not brought about fundamental technological changes to distributed data processing, it still triggers overwhelming research and practices on various protocols and algorithms. In this article, I will

Tags: its modified redo strong no size contains span ackACIDRefers to the four characteristics of the transaction in the database management system (DBMS): atomicity (atomicity), consistency (consistency), isolation (isolation, also known as independence), persistence (durability). In a database system, a transaction refers to a complete logical process consisting of a series of

ACID, refers to the database management system (DBMS) in the process of writing/updating data, in order to ensure that the transaction (transaction) is correct and reliable, must have four characteristics: atomicity (atomicity, or called indivisibility), consistency (consistency), Isolation (isolation, also known as independence), persistence (durability). In a database