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on the size of the data.resolves a memory fragmentation problem , but creates a waste of memory ( such as 100bytes of data to be stored in a block of )tuning : adjusting the block size of a group based on data sizedata deletion aspects of MemcachedU Memcached does not really delete data , does not monitor expired data , but checks for expiration at get , This technique is called lazy ( lazy )U LRU overwrites the least recently used dataMemcached 's DistributedYou are fully implemented by the

, and supports discontinuous subnets.3, with the same autonomous system is not fixed (refers to the same management domain, is a management concept, not fixed) the number of EIGRP and IGRP (both have the same measure, that is, the standard is the same measure of link quality is the same), can seamlessly exchange routing information.function1, through the protocol related modules support Ip,ipx,appletalk (that is, only one network protocol is required to support different networks)2, no-class rou

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must be balanced in these hosts.4. Dispersion: In a distributed environment, the terminal may not see all the buffers, but can only see a portion of them. The end result is that the same content is mapped to different buffers by different endpoints when the terminal wants the content to be mapped to buffering through a hashing process, because the buffer range seen by different terminals may be different, resulting in inconsistent results for the has

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original or new buffer without being mapped to other buffers in the old buffer set. 3, Dispersibility (spread): In a distributed environment, the terminal may not see all the buffers, but only to see a part of it. When a terminal wants to map content to a buffer through a hashing process, because the buffer ranges seen by different terminals may be different, resulting in inconsistent results of the hash, the end result is that the same content is mapped to different buffers by different termin

inheritance or object-oriented aggregation. In general, any abstract data type, if the other abstract data type as its own member, then it will produce data abstraction coupling (DAC); In other words, if a class uses an instance of another class as its own member variable, then data abstraction coupling is generated. The higher the coupling degree, the more complex the data structure of the system is. Shen thought note: In other words, if you use too many other classes in a class, you will defi

MySQL uses federated indexes only the left side of the section, such as index (A,B,C), can be used when the condition is a or a,b or a,b,c, but the index is not used when the condition is b,c. It's like a book based on last name, the phone book, sorted by name, is more efficient than no conditions when looking for a last name, but if the name is still famous on the basis of the condition, the phone book will not work. Higher-discrete indexes should be placed in front of the federated index beca

injected code is responsible for initializing the bot and joining the botnet. locating kernel32 searching Apis–often used by Shellcode Start Main thread the Super Weapon–p2p-based botnet Overview In recent years, Peer-to-peer technology has been used frequently, worms and has more and more become. The p2p-based botnet is very hard to trace and to shut down, because the botnet has robust, network connectivity, uses ENCR Yption, and controls traffic disp