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1. Top results related to which source more reliable primary or secondary memory requires

   • Primary or secondary?

     Top Answer

     Answered Apr 10, 2021 · 3 votes

     In RDBMS, primary index can be dense or sparse. That is depend on you requirement.

     Primary index: in a sequentially ordered file, the index whose search key specifies the sequential order of the file

     Secondary index: an index whose search key specifies an order different from the sequential order of the file.

     Dense index: Index record appears for every search-key value in the file.

     Sparse Index: contains index records for only some search-key values.

     For Sparse index, a good tradeoff would be keeping an index entry for every block in file. When we are reading an entry from the storage, we take the entire block and go through it. We can skip the mappings that are included in that block.

     For Primary index, we can have a dense or sparse index.

     But for secondary index, it is essential to have dense index as the data entries are not in a sequential order for the secondary index. Main point of keeping a sparse index is that we should be able to find out the other search keys with the help of it. That can only be achieved if the files are in order. That's why we need an index mapping for every search key in secondary index which is dense index.

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   • Which one is more efficiency, static memory allocation or dynamic memory allocation

     Top Answer

     Answered May 06, 2015 · 3 votes

     Static allocation, by which I assume you mean using the keyword static, takes place at link time. At runtime it is essentially zero cost, apart from a possible effect on program load time.

     You can't get any more efficient than that.

     EDIT

     Stack allocation takes place by incrementing and decrementing a register. It is less efficient than static but considerably more efficient than using runtime memory allocation libraries.

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     2/5

   • Which takes more memory, string value or long value?

     Top Answer

     Answered Apr 16, 2012 · 4 votes

     Having a service layer that output values that are formatted is a very bad idea. What happens if the requirements change and rather than a GB suffix, the client application UI needs to output in bytes? e.g. 56,371,445,760 ? This will required the client application to parse then re-format the data sent by the server.

     Also, determining the memory required to store an individual variable is easy. What is not so easy is to work out the overall impact to your application. Different types will be handled differently in your code, and as a result a smaller variable might incur a greater cost.

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     3/5

   • Redux State is stored in Primary Memory (or) Secondary Memory?

     Top Answer

     Answered Jun 01, 2021 · 1 votes

     A Redux state is just a variable. It is stored in RAM unless your computer runs out of resources and needs to swap to HDD. But that is true for every variable and not specific to Redux or even JavaScript, but an Operating System behaviour.

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     4/5

   • Where does a New Process reside? In Primary Memory or Secondary Memory?

     Top Answer

     Answered Jun 15, 2016 · 2 votes

     When a process is in the "new" state right after its creation through fork system call or something similar, it initially resides on the main memory. Depending on the amount of available memory, the OS may decide to swap it out to secondary storage or keep it in main memory. Refer to the process state transition diagram (taken from The Design of Unix Operating System) below - To quote it directly from The Design of Unix Operating System -

     The process enters the state model in the "created" state when the parent process executes the fork system call and eventually moves into a state where it is ready to run (3 or 5). The process scheduler will eventually pick the process to execute, and the process enters the state "kernel running" where it completes its part of the fork system call.

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2. www.geeksforgeeks.org › difference-between-primaryDifference between Primary and Secondary Memory

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   Mar 8, 2024 · Secondary memory is permanent. Primary memory is faster than secondary memory because it is directly accessible to the CPU. Secondary memory is non-volatile, which means it retains data even when the power is off. Primary memory is directly accessible by Processor/CPU. Secondary memory is not directly accessible by the CPU.

3. alchemlearning.com › similarities-and-differencesSimilarities and Differences Between Primary and Secondary Memory

   alchemlearning.com › similarities-and-differences

   1. Volatility: Primary Memory: Volatile, loses data when power is off. Secondary Memory: Non-volatile, retains data even when power is off. 2. Speed: Primary Memory: Faster access times, suitable for high-speed data processing. Secondary Memory: Slower access times, primarily used for long-term storage. 3.

4. www.khanacademy.org › a › computer-secondary-memorySecondary (external) memory | AP CSP (article) | Khan Academy

   www.khanacademy.org › a › computer-secondary-memory

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   • Overview
   • Storage types
   • Storage speed

   When computers need to store data for long-term retrieval, they use secondary memory, also known as auxiliary storage or external memory.

   See full list on khanacademy.org

   Personal computers come with a hard drive, a permanently attached secondary storage. Many computers have input ports for USB drives or SD cards, forms of portable secondary storage. That allows us to store lots on our computers, but also to easily transfer from one computer to another.

   Secondary storage devices can be implemented using a variety of electronic technologies, like flash memory, optical discs, and magnetic disks.

   See full list on khanacademy.org

   To the computer, all secondary storage acts the same way. The CPU can write data into storage and it can read data from storage.

   To the user, what matters is the speed of those read/write operations. Flash memory is faster than its predecessors, so most new computers come with that.

   🔍 What secondary storage does your computer use? You can typically find that information if you poke around your system settings. I discovered that my Mac uses flash memory:

   🙋🏽🙋🏻‍♀️🙋🏿‍♂️Do you have any questions about this topic? We'd love to answer— just ask in the questions area below!

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5. www.guru99.com › primary-vs-secondary-memoryDifference Between Primary and Secondary Memory - Guru99

   www.guru99.com › primary-vs-secondary-memory

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   May 1, 2024 · How to Choose Between Primary Memory and Secondary Memory. In managing data processing, I depend on computer memory to serve as the storage area for data and for retaining the needed instructions. Two types of memories are: 1) Primary memory and 2) Secondary memory; Primary memory is the main memory of the computer system.

6. thisvsthat.io › primary-memory-vs-secondary-memoryPrimary Memory vs. Secondary Memory - What's the Difference ...

   thisvsthat.io › primary-memory-vs-secondary-memory

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   This larger capacity comes at the cost of slower access speeds compared to primary memory. Secondary memory is also slower in terms of data access and retrieval. Unlike primary memory, which allows for direct access by the CPU, secondary memory requires data to be transferred to primary memory before it can be processed.

7. www.ampheo.com › blog › types-of-memory-primaryTypes of Memory: Primary Memory and Secondary Memory

   www.ampheo.com › blog › types-of-memory-primary

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   Sep 4, 2023 · Memory in a computer is the essential component responsible for storing programs and data. It can be classified into two main types: primary and secondary. Primary memory, made up of semiconductors, consists of two subtypes: Read-Only Memory (ROM) and Random Access Memory (RAM). ROM is a non-volatile memory that contains permanent instructions ...

8. People also ask

   What is the difference between primary and secondary memory?

   • Secondary memory defines to additional storage devices that are utilized to store data permanently. Primary memory is temporary. Secondary memory is permanent. Primary memory is faster than secondary memory because it is directly accessible to the CPU. Secondary memory is non-volatile, which means it retains data even when the power is off.

   Difference between Primary and Secondary Memory - GeeksforGeeks

   www.geeksforgeeks.org/difference-between-primary-and-secondary-memory/

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   Why do we need secondary memory?

   • One of the primary reasons we need secondary memory is its ability to offer long-term storage for data, files, and programs. Unlike primary memory, which is volatile and loses its contents when power is turned off, secondary memory is non-volatile, ensuring that data is retained even without a power source.

   Types of Memory: Primary Memory and Secondary Memory

   www.ampheo.com/blog/types-of-memory-primary-memory-and-secondary-memory.html

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   What are examples of secondary memory?

   • The examples of secondary memory are the hard disk, floppy disk, CD, DVD, etc. The key difference between primary and secondary memory is that primary memory can be directly accessed by the CPU whereas, the CPU can not directly access the secondary memory. The primary memory of the computer is also known as the main memory of the computer.

   Difference Between Primary and Secondary Memory

   techdifferences.com/difference-between-primary-and-secondary-memory.html

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   Why is primary memory faster than secondary memory?

   • Accessing data from primary memory is faster because it is the computer’s internal memory. The primary memory is the most volatile, meaning data in the primary memory does not exist if it is not saved when a power failure occurs. The primary memory is a semiconductor memory. It is costlier compared with secondary memory.

   Difference Between Primary and Secondary Memory - Guru99

   www.guru99.com/primary-vs-secondary-memory.html

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9. techdifferences.com › difference-between-primaryDifference Between Primary and Secondary Memory

   techdifferences.com › difference-between-primary

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   The primary memory is semiconductor memory and is more expensive than secondary memory. The primary memory capacity is limited in computer and is always smaller than secondary memory. Primary memory can be divided into two types of memory that are RAM (Random Access Memory) and ROM (Read Only Memory). RAM is both read and write memory. The data ...