How can I ensure the integrity and availability of data even if three physical disks are damaged?

One. Constraints on Error Data Set SQL Mode to Strict Mode to prompt. From the perspective of application level, there are three levels of data validation, namely the database layer, the application interface layer and the business logic.

In the case of this one, you need to use software to fix it, if it can't be fixed. There's really no way around it.

If the group raid is broken, nothing can be done.

Hardware, also known as "hardware equipment", is the physical device of the entire computer system, which is composed of all parts and entities of electrical, mechanical, and other devices.

The hardware of a computer is generally divided into five parts:1An input device is a device that feeds a computer with pre-given calculation steps and raw data.

It is equivalent to a human sensory organ or pen, which receives foreign information through a punch card, punch tape, and magnetic tape, and sends it to a computer for storage. 2.Memory is a device that records and saves raw data, calculation steps, and intermediate calculation results.

It is equivalent to the memory part of the human brain or paper, where information from the input device is stored. Among them, the internal memory mainly stores the information that can be accessed at any time, and the access time is short;External memory, on the other hand, holds information that is less commonly used and has a longer access time. 3.

Combinators are devices that perform various basic operations. It is equivalent to an abacus, which automatically calculates, sorts, judges, and analyzes the information of the stored person, and then sends the results of the operation into the memory. 4.

An output device is a device that reports the results of calculations. It is the equivalent of a person's reaction organ or pen. Commonly used output devices include printers, phosphor screen display devices, etc.

5.The controller is a device that controls and directs the information processing of the entire computer. It is the core device of the computer, which is equivalent to the human brain and hand.

People calculating a problem generally require paper, pens, and computing tools such as abacus, as well as the people who use these computing tools, and the five components of computer hardware are similar.

Computer hardware: A general term for various physical devices in a computer system.

A physical hard drive is a hardware entity, i.e., a hard drive that is installed inside a computer caseA logical hard disk is a physical partition that is artificially partitioned to facilitate access and management of the files inside. Moving from a folder to another in the same partition is done quickly, because it changes the individual data in the file allocation table of this partition, and it takes a long time to move to a folder in another partition, which is caused by the actual data being moved. Therefore, from the phenomenon point of view, logical hard disks are like completing several independent hard disks; Virtual hard disk is a function used for large memory users, delineate an area from the memory, make the format of the hard disk to store data, can store data like a hard disk, the speed is extremely fast, in some occasions with this technology can reduce the number of reads and writes of the hard disk, effectively extend the life of the hard disk. **。

In layman's terms, it can be thought of as such.

Hardware, it's all things that can be seen and touched. The most common are the main unit and monitor. Of course, there are a few large chunks in the host.

Of course, based on different theories, different hardware can constitute different platforms. Our computers are now all Feng. Leuyman structure.

The software is virtual, ** or something. Since it's virtual, of course, something needs to be attached to it to show its effect, and that's hardware. Software can be divided into system software, such as the operating system (OS), and application software, such as various games, QQ, etc.

Generally speaking, I think that what is physical is that the thing actually exists and can be touched. I don't know if that's what you mean.

Generally, they are hardware resources, and the resources that can be seen are called physical resources.

Your two memories must be good, because a bad memory computer can't start, but they are incompatible with each other, change to one of the same model,

Your 2 memories are good, but they're incompatible, and I've encountered this before, and the 2 memories are compatible at the beginning, and after a long time, they're incompatible, and I think so.

Haven't encountered it

Unplug it and replug it to see.

Right-click on my computer and take a look at Properties.

Not compatible, and your motherboard does not support dual-channel ???