cloud storage advantages and disadvantages

In many cases, int char bit set Enum can be replaced. The advantages and disadvantages of these types are described below. Take the gender field used to create a user table in the database as an example. What are the advantages and disadvantages of the following types? 1. INT: Gender tinyint unsigned not null The advan

(about 100 miles ). Asynchronous remote image (asynchronous replication technology) is provided by the local storage system to request the I/O operation of the image host to complete the confirmation information, ensure that the basic operations for outputting/inputting data to the local storage system are completed before updating the remote storage view, that

as the violation of the URL and resource positioning of the original intention. For example, I give you a URL address, if you use Ajax technology, perhaps you see below the URL address and I see under this URL address is different. This is a departure from the original purpose of resource orientation. 6, some handheld devices (such as mobile phones, PDAs, etc.) are not good enough to support Ajax, such as our mobile browser to open the use of AJAX technology site, it is currently not supported

Today I understand a function, I found that the database column name is actually Chinese, work more than six years to see. Only remember when school, our teacher said there will be compatibility and other issues, the specific has not been clearly written.I am a good thing Baidu, finishing up the answers given by the netizens, hope to help everyone.When we use the table and column names in Chinese, we first confirm whether the database we are using supports Chinese table names and column names. F

adjacent elements in the physical storage location is also adjacent, and the linked list is not necessarily;3, the storage space, the linked list because with the pointer field, storage density is not as large as the array;4, by ordinal search, the array can be randomly accessed, the time complexity of O (1), and the list does not support random access, the aver

on standardized and widely supported technology, do not need to download plug-ins or small programs. Disadvantages: 1, Ajax killed the back button, that is, the browser backward mechanism of the damage. 2, there are certain security issues. 3, the search engine support is weaker. 4, the failure of the program's abnormal mechanism. 5, can not use the URL direct access. The above is a small set to introduce the AJAX working principles and

number of users in use.NTFS file system benefits: NTFS partitioning has high security and stability and is not easy to produce file fragmentation in use. It can record the operation of the user, through a very strict restrictions on user rights, so that each user can only follow the system-assigned permissions to operate, and fully protect the system and data security. In addition, for most users, the most intuitive advantage of NTFS is that the size of a single file breaks the 4GB limit of FAT

provides a faster speed. Molap As the most commonly used OLAP analysis method, in molap, data is stored in multi-dimensional cubes, and the multi-dimensional data is organized as the core. That is to say, molap uses multi-dimensional arrays to store data. Multi-dimensional data will form a "cube" structure in storage, in molap, "rotation", "cut", and "slice" of "cube" are the main technologies used to generate multidimensional data reports.

using the GUID master key:1, storage space is large (in bytes), so it will take up more disk size.2, difficult to remember. Join operation performance is lower than Int.3. There is no built-in function to get the newly generated GUID primary key.4. The GUID master key will be added to the other indexes on the table, thus reducing performance.Summarize:The advantages and

-server data merging is very convenient.Disadvantages of using the GUID master key:1, storage space is large (in bytes), so it will take up more disk size.2, difficult to remember. Join operation performance is lower than Int.3. There is no built-in function to get the newly generated GUID primary key.4. The GUID master key will be added to the other indexes on the table, thus reducing performance.Summarize:The ad