What are the reasons for the high efficiency of AS400 in data processing?

This article shows you several reasons for the high efficiency of AS400 in processing data. The content is concise and easy to understand, and it will definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.

There are several reasons why AS400 is more efficient than SQL in open platform databases. I thought about it for a moment to see if it was correct.

1, there is no parsing processing of sql statements, direct operation of file pointers, no statistical updates, and no wrong index selected by the system.

2, directly locate the file pointer position when accessing, and then READ,READP, read before and after the record, without the need to prepare the result set in advance like sql (the result set is the most consuming factor).

3Precedence PF is a fixed-length record, which can be located directly through RRN, which has an advantage when reading PF records through LF, while oracle index records rowid,mysql is even worse, index records primary key, back to the table to read records to re-search, more time-consuming.

4, multi-page query, the traditional writing method can flexibly control which records to start reading, which records to skip, and when to finish reading, sql is very difficult to control.

5, the system will load the read table pages for memory use, and can also be controlled manually, while non-400 applications can only implement memory caching on their own.

6 java AS400 application accesses files locally and does not need network communication or inter-process communication. At present, it is common for AS400 to access open platform database, and each visit is network communication, which consumes a lot. In fact, if you refer to the idea of 400 processing, to achieve a domestic file database, is not bad.

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