Database

Database is the store where related data is stored at, so that the computer programs can easily select or edit programs.

Database is handled by software, which must be able to create, retrieve, update and delete the data in the Database.

A Serial File is a file of items that are stored together as a series, one after another, to ease the writing of a program to find an item in the file.

A Sequential File is a Serial File which stores the items in order.
A Sequential File can also accessed using an index, which is a separate file, where the software looks up the position of the item in the index and goes straight to the part of the file where the required data is, then does a serial search there. These files are called Indexed Sequential Files.

Flat File Database is Database consisting only one table. It's made from fields ( a characteristic of something stored in a database) and  records ( all the data about one item in a database).

A Field Key is the key field that we have to look back at on every record.

Secondary Storage

Some examples of Magnetic Hard Disks are Samsung/Seagate 1TB 2.5 inch 5400RPM SATA II Hard Disk Drive      

There are three different type of Secondary Storage, Magnetic Hard Disks, which are the most common type of secondary storage, Optical Disks, for example CDs and DVDs, and Flash Memory, which is the electronically alterable Read Only Memory, which costs £49.99, Generic Hard Disk Drive 250GB SATA II which costs £25.99.

Binary Logic

 Binary Logic

 

Computer system use the BINARY arithmetic system which basically is a number system that uses only 0 and 1 to represent all numbers.

 

The digital computer uses an arrangement of tiny electronic switches (transistors) called LOGIC GATES connected together, which are used to manipulate the signals within the processor.

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Today we learned about what a CPU is and how it works.
A CPU works by receiving the information from the RAM ( INPUT ) and it goes to the ROM to find out how to do it, this method is executed in Lighting Speed though so it doesn't affect the user.
When the CPU gets the right knowledge for how to execute the command that we commanded he executes it.

We also learned that the CPU fetches the next instruction, decodes it and executes it before repeating the process. This process is called Fetch-Execute Cycle.