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Reference: https://eco.dameng.com Guidelines for managing indexes Index: provides a faster path to access table data DM8 common types typedescribeClustered indexEach ordinary table has and has only one clustered indexunique indexThe index data is unique according to the index keyFunctional indexContains the precomputed value of the ...

js array traversal method summary   Array traversal method 1.for loop Use temporary variables to cache the length to avoid repeatedly obtaining the array length. The optimization effect will be more obvious when the array is large. 1 2 3 for(j = 0,len=arr.length; j < len; j++) {      }   2.foreach cycle Traverse each item ...

Main shared content (1) Keywords final and static (2) Data type (3)BigDecimal (4) Generics Keywords final and static (1)final 1. Data The declared data is a constant, which can be a compile time constant or a constant that cannot be changed after initialization at run time. For basic types, final keeps the value unchanged; For reference types, ...

1, Background introduction There are many split services in the distributed system. In the process of continuous iterative upgrading, the following common thorny situations will occur: For the version upgrade of a technical component, depending on the package upgrade leads to the expiration of some syntax or API, or the component fixes urgent ...

Explore YOLO v3 source code - Part 5 Loss GitHub source code of this article: https://github.com/SpikeKing Updated: Part 1 training: https://mp.weixin.qq.com/s/T9LshbXoervdJDBuP564dQ Part 2 model: https://mp.weixin.qq.com/s/N79S9Qf1OgKsQ0VU5QvuHg Part 3 network: https://mp.weixin.qq.com/s/hC4P7iRGv5JSvvPe-ri_8g Chapter 4 tru ...

At first, I refused to operate Zookeeper. I haven't done this thing, but I've always known about it, and I've never used it; Well, after reading the official website documents and trying for a period of time, I can only say "that's it ~". This article does not involve too much other people's blog knowledge, just look at it zk officia ...

1, Experimental purpose This experiment aims to let students have a preliminary understanding of pattern recognition and have a deep understanding of Bayesian classification algorithm according to their own design 2, Experimental principle 1. Bayesian classification algorithm         Bayesian classification algorithm is a ...

leetcode lecture on algorithm interview in Dachang 3. Dynamic programming Video tutorial (efficient learning): Click to learn catalog: 1. Introduction 2. Time and space complexity 3. Dynamic planning 4. Greed 5. Binary search 6. Depth first & breadth first 7. Double pointer 8. Sliding window 9. Bit operation 10. Recursion & ...

Problem analysis: Error installing whl from pip: ERROR: *** is not a supported wheel on this platform This is because pip will verify whether it is suitable for the current environment according to the name of whl. Two situations may lead to this error: 1. Environment adaptation, but the verification fails due to the self modified naming of ...

1. What is micro serviceA set of small services is used to develop a single application. Each service runs in an independent process. It is generally interconnected by lightweight communication mechanism, and they can be deployed in an automatic wayMicro service is a design idea, not a reflection of quantitySpecific functionA lot of codeComplex ...