nosql advantages and disadvantages

Recently, a friend asked me how to analyze the advantages and disadvantages of a website, and then extended to how to optimize the site and website promotion work? This problem is in many areas of the proposition, not one or two words one or two articles can be said. This article belongs to the Cubs general idea of a primer on how to analyze the site, how to optimize the site, how to promote the site of a f

because, because these columns have very few values, such as the gender column of the personnel table, in the results of the query, the data rows of the result set occupy a large proportion of the data rows in the table, that is, the data rows that need to be searched in the table are large. Increase the index,Does not significantly speed up the retrieval. (3) For those columns that are defined as text, the image and bit data types should not increase the index. This is because the amount of da

The advantages of normalization: Normalization of update operations is usually faster than inverse normalization. When the data is well normalized, there is little or no duplication, so you only need to modify less data. A normalized table is usually smaller and better placed in memory, so it is faster to perform the operation. There is little extra data that means fewer distinct or group by statements are needed to retrieve list

Today I understand a function, I found that the database column name is actually Chinese, work more than six years to see. Only remember when school, our teacher said there will be compatibility and other issues, the specific has not been clearly written.I am a good thing Baidu, finishing up the answers given by the netizens, hope to help everyone.When we use the table and column names in Chinese, we first confirm whether the database we are using supports Chinese table names and column names. F

Label: Summary of advantages and disadvantages of ORACLE five tables:1. Normal table (heap table): Suitable for most design scenarios, with advantages and disadvantages.Strengths:A, the syntax is simple and convenientb, suitable for most scenesDisadvantages:A, the update log cost is largeB,delete Cannot free space (HWM high water mark does not drop)C, table recor

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Tags: language keyword trigger copy table market share form beauty of memory data electronics1 Requirements What are some of the database management Systems (DBMS) on the market today, and what are their characteristics? What are the advantages and disadvantages between them? What are their use cases, respectively? 1.1 What kind of database management system (DBMS) is present on the market? The most common

provides a faster speed. Molap As the most commonly used OLAP analysis method, in molap, data is stored in multi-dimensional cubes, and the multi-dimensional data is organized as the core. That is to say, molap uses multi-dimensional arrays to store data. Multi-dimensional data will form a "cube" structure in storage, in molap, "rotation", "cut", and "slice" of "cube" are the main technologies used to generate multidimensional data reports. Advantages