The db on the network is: 1. Database, which is a warehouse that organizes, stores and manages data according to the data structure; 2. An element symbol; 3. Data interface; 4. Decibel; 5. Assembly language The pseudo-operation command is used to define the number of bytes occupied by the operand.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
The letters DB represent the following meanings:
1. Database
is a warehouse that organizes, stores and manages data according to the data structure. It was born a long time ago Fifty years ago, with the development of information technology and market, especially after the 1990s, data management is no longer just about storing and managing data, but has transformed into various data management methods required by users.
2. An element symbol.
3. Data interface.
4. Decibel
represents a unit, that is, the ratio of two electrical or sound powers or the ratio of two voltage or current values or similar sound volumes; decibel is also a measure of the relative loudness of sound. The unit.
5. Pseudo operation command in assembly language
It is used to define the number of bytes occupied by the operand. Here B is the abbreviation of byte, that is, bytes, so this pseudo operation Each operand defined occupies 1 byte (8 bits).
Extended information:
DB database now has four major categories:
(1) Key-value pair storage: represents the software Redis, Its advantage is that it can quickly query data, but its disadvantage is that it needs to store the relationship between data.
(2) Column storage: represents the software Hbase. Its advantage is that it can quickly query data and has strong scalability of data storage. The disadvantage is that the functionality of the database is limited.
(3) Document database storage: represents the software MongoDB. Its advantage is that it does not have particularly strict requirements on data structure. The disadvantages are poor query performance and the lack of a unified query language.
(4) Graph database storage: represents the software InfoGrid, which has the advantage of being able to easily use graph structure-related algorithms for calculations. The disadvantage is that in order to obtain results, the entire graph must be calculated, and graph databases are difficult to use when encountering unsuitable data models.
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