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what is index
Indexing refers to a tool that classifies, organizes, labels and arranges books, documents, documents, etc. according to certain rules to facilitate readers to quickly find the information they need. This topic provides you with various articles, downloads and courses related to indexing.
What is an index?An index is a separate, special database structure that physically sorts the values of one or more columns in a database table. It is a collection of one or more column values in a table and a corresponding pointer to the physical identification of these values in the table. List of logical pointers to data pages. The index is equivalent to the table of contents of a book. You can quickly find the required content based on the page numbers in the table of contents.
What is an index? How to create an index in MySQLIndex is a very magical thing. I remember that when I was learning data structure, I learned about B-tree. At that time, I heard it in a fog. No matter what the teacher said, it was difficult to understand, but his role was to understand. It is this data structure that can improve the efficiency of queries.
What is the index of access?In an access relational database, an index is a separate, physical storage structure in a relational database that sorts the values of one or more columns in a database table. It is a collection of one or several column values in a table. and a corresponding list of logical pointers pointing to the data pages in the table that physically identify these values.
What is redis indexRedis indexes are divided into range indexes and non-range indexes; for non-range unique indexes, we can simply save the index as a KV pair, and v saves the main key; for range retrieval or non-unique indexes, redis must be used zset to achieve. Redis does not directly support indexes and needs to be maintained by yourself.
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