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Multi indicates the start of a transaction, and multiple commands in the transaction block are sequentially put into a queue, and finally executed by exec. time Complexity: O (1) Return Value: total returns OKdiscard to cancel the transaction and discard all commands of the transaction block. if you are using watch monitoring, all monitoring will be canceled. time Complexity: O (1) Return Value: Total Retur
and specify the validity period of the KEY value.?? Setex twnmae 10 red;??4: setrange sets the substring of the value of the specified KEY.???? Setrange name 6 tangwen.org ?? Replace the value with tangwen.org. 5: mset sets the value of multiple keys at a time. 0 k is returned for success, and 0 is returned for failure; ? Mset key1 value1 key2 value26: getset? Set the new value of the key and return the old value of the key. 7: getrange gets the substring.? Getrange name 0, 6? Returns the subsc
elements into the collection SetaSmembers Seta//View all elements in a collectionSrem Seta AAA//delete elementSpop Seta//randomly take out an element, deleteSdiff Seta SETB//differential set, Seta as standardSinter Seta SETB//Seek intersectionSunion Seta SETB//Request and setSdiffstore setc Seta SETB//differential set, and stored in setc, view Smembmers setcSinterstore setd seta SETB//ask for intersection and store setd, view Smembmers setdSunionstore Sete Seta SETB//set, and stored to SeteSism
NoSQL Injection Analysis and relief, nosql injection relief Key points of this article: 1. learn about new security vulnerabilities targeting NoSQL 2. five types of NoSQL attack methods, such as repeat, joint query, JavaScript injection, back-to-back query (Piggybacked queries), and cross-Origin Violation 3. OWASP orga
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 "NoSQL
NoSQL data model (4) Summary of nosql aggregation, NoSQLBackground in the first three articles, we have introduced three databases that belong to the aggregation model in NoSQL: Key-value type, document type, and column family type. The following analyzes the common points and differences of the three aggregate data models to better understand their respective ch
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 than 1 times, 5 minutes more than 10, 11 minu
[ArticleAuthor: Sun Li link: http://www.cnblogs.com/sunli/ updated by: 2011-2-21] The previous two articles, "Why use nosql" and "relational database or nosql Database", roughly introduced why nosql should be used and when nosql should be used. I often feel confused when I see the introduction 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 "large amounts of data write operations", I understand that should be "a large number of data
The previous "Why Use NoSQL" and "relational database or NoSQL database" two articles generally explain why NoSQL is used, and when to use NoSQL. Often have friends encounter confusion, see the introduction of NoSQL, feel very good, but do not know how to formally use their
Do you really understand the nosql world ?, Nosql world Recently, I want to sort out my nosql knowledge and some nosql databases. One is to deepen your understanding of nosql, and the other is to organize your knowledge to make it more organized. So I started to
NoSQL architecture practice (I)-supplemented by NoSQL (1) using NoSQL as an image It does not change the original architecture that uses MySQL as the storage, uses NoSQL as the auxiliary image storage, and uses the advantages of NoSQL to help improve performance. Figure 1-
The reason for writing this article is that mysql5.6.2 suddenly launched the memcached function. The emergence of nosql to InnoDB with memcached shows that nosql has indeed had a huge impact on relational databases. I personally think this is a huge improvement, allows developers to use nosql and relational databases more conveniently.
Before you start IBM NoSQL Wire Listener for DB2 (hereinafter referred to as "Wired Listener") provides the following features: Enables developers to use the skills they acquire in the process of storing the JSON document in DB2. It also supports applications written using the MongoDB driver and applications written using the MongoDB command shell commands. Use the features provided by the DB2 JSON API
The reason for writing this article is that MySQL5.6.2 suddenly launched the memcached function. The emergence of NoSQL to InnoDB with Memcached shows that NoSQL has indeed had a huge impact on relational databases. I personally think this is a huge improvement, allows developers to use NoSQL and relational databases more conveniently.
Differences between NoSQL and SQL: NoSQL and SQL. About the difference between NoSQL and SQL, NoSQL and SQL simply put: SQL is a structured query language for relational databases, while nosql generally refers to relational databases, and SQL statements cannot be used, no di
Label:The NoSQL column has been applied for almost a year, and has not filled an article, see today, or write an article put it in. Now the number of people who apply NoSQL is also very many, we may no longer be unfamiliar, the Chinese information has been flying all over the sky. But there are few answers to the questions about NoSQL. It may be that everyone is
MongoDB-NoSQL, nosql Comparison between mongoDB and SQL: The biggest difference from a common database is structured and unstructured. NoSQL: Generally, it refers to non-relational databases. Compared with relational databases, in fact, its previous evolution is a data organization combined from a two-dimensional table and its relationships. A two-dimensional tab
transaction changes A, then the B must be changed so that the transaction will still satisfy a+b=10, otherwise the transaction fails.3, I (isolation) IsolationThe so-called independence refers to the concurrent transactions do not affect each other, if one transaction to access the data is being modified by another transaction, as long as another transaction is not committed, the data it accesses is not affected by uncommitted transactions.For example, there is a transaction from a to 100 yuan
The top 10 SQL and NoSQL databases in the latest statistics, and nosql databases in the latest statistics This ranking is based on the ranking of DB Engines, which analyzes the popularity of 200 different databases on the market. The Top 10 databases are listed here. Undisputed Top 3 Oracle, MySQL, and Microsoft SQL Server have always dominated the top three in the ranking by their absolute advantages, shar
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