icp warranty

256 # ICP is a lightweight target location protocol that was invented as part of the harvest project. An ICP customer sends a query message to one or more ICP servers and asks if they have cached a URI. Each server responds to an icp_hit (ICP hit), icp_miss (ICP lost), or

(surrogate). It is located at the edge of the network and is only "One hop" away from the user. At the same time, the proxy cache is a transparent image of the content provider source server (usually located in the data center of the CDN service provider. This architecture enables CDN service providers to provide end users with the best possible experience on behalf of their customers, that is, content providers. These users cannot tolerate any latency in request response time. According to sta

release mode, the release of content is completed by the ICP Application server, and the network is only a transparent data transmission channel, this kind of transparency shows that the quality assurance of the network stays at the level of the packet, but cannot differentiate the service quality according to the different content objects. In addition, because the IP network's "best effort" characteristics make its quality assurance relies on the us

publishing. By introducing active Content management and global load balancing, CDN is fundamentally different from the traditional content release mode. In the traditional content release mode, the release of content is completed by the ICP Application server, and the network is only a transparent data transmission channel, this kind of transparency shows that the quality assurance of the network stays at the level of the packet, but cannot differen

The difference between a bulk and a boxed From the technical point of view, the bulk and boxed CPU is not the essence of the difference, at least in terms of quality and performance does not exist problems, more impossible to have a fake CPU (no manufacturers can counterfeit such high-tech products), of course, do not rule out profiteers after grinding to low frequency as a high-frequency CPU. For CPU manufacturers, their products can be divided into two categories according to the mode of supp

the difference between CPU bulk and boxed From the technical point of view, the bulk and boxed CPU is not the essence of the difference, at least in terms of quality and performance does not exist problems, more impossible to have a fake CPU (no manufacturers can counterfeit such high-tech products), of course, do not rule out profiteers after grinding to low frequency as a high-frequency CPU. For CPU manufacturers, their products can be divided into two categories according to the mode of supp

order of the filter in the Where does not need to be consistent with the index, but it must be consistent if there are sorting or grouping. For example, if you have a federated index idx1 (A, B, c), the following SQL can be used for full indexing : SELECT ... WHERE B =? and C =? and a =?; --Note that the field order in where does not match the order of the indexed fields SELECT ... WHERE B =? and a =? and C =?; SELECT ... WHERE a =? and b in (?,?) and C =?; SELECT ... WHERE a =?and B =? ORDER b

layer and global load balancing, the CDN is fundamentally different from the traditional content publishing model. In the traditional content publishing mode, the content is published by the application server of the ICP, and the network is only represented as a transparent data transmission channel, which is manifested in the quality assurance of the network only stay at the level of the packet, but not according to the different content objects dif

fundamentally different from the traditional content publishing model. In the traditional content publishing mode, the content is published by the application server of the ICP, and the network is only represented as a transparent data transmission channel, which is manifested in the quality assurance of the network only stay at the level of the packet, but not according to the different content objects differentiated service quality. In addition, be

traditional content publishing mode. In the traditional content publishing mode, content publishing is completed by the ICP application server, while the network is only a transparent data transmission channel, this transparency is manifested in the quality assurance of the network, which only stays at the layer of data packets, but cannot distinguish the quality of service based on different content objects. In addition, due to the "Best Effort" fea

Original link: http://blog.csdn.net/zbszhangbosen/article/details/7463382 Another article spoke MRR and BKA. What is indexcondition pushdown (ICP)? Pushdown in the database indicates that some operations are "pushed down", that is, some operations are executed ahead of schedule, and some actions push down when the execution plan is generated (why push down, because the optimizer is called the execution plan tree in the generated plan, the operation st

MySQL 5.6 Reference Manual/Index Condition pushdown optimization 8.2.1.6 Index Condition pushdown optimization Index Condition pushdown (ICP) is a optimization for the case where MySQL retrieves rows from a table using a Index. Without ICP, the storage engine traverses the index to locate rows in the base table and returns them to the MySQL server Which evaluates thewherecondition for the rows. With

MySQL server layer does not unlock non-qualifying records. And it locks all gaps in the primary key index.Refer to an example in the teacher's articleUnder REPEATABLE Read isolation level,Index key:pubtime > 1 and Puptime Index Filter:userid = ' hdc '. This condition, which can be filtered on the Idx_t1_pu index, is not part of index Key.Table filter:comment is not NULL. This condition, which cannot be filtered on the Idx_t1_pu index, can be filtered only on the clustered index.His lock-up situ