How choose notebook?

One of my friends faced this question in an interview: -.

If my SGA DB is 5 GB, and when I select the table of 10 GB. How to select statement works. ?


Can someone please explain to understand how it works. Thanks in advance.


Of course, the documentation is the right plase to start, and when you read the guide concept you need to know all the details.

Let me summarize in very simple, this can happen. (in recent versions, there are many ways, Oracle can do its totally different job, but remain at the simple basics):

I guess you want to retrieve all rows containing all the columns in your table.

If your server address (the one that serves your statements)

  • get some basic information about the table

    • determine how many blocks is worth to read in one piece (let's say it's in the field of 128 blocks)
    • get the right number of buffer cache in SGA
    • in order to load these blocks of the disk to the buffer cache
    • checks if the block has a reasonable SNA for your transaction (say all the blocks are compatible from your point of view of statements)
      • extract blocks of lines
      • Put them in a packet network
      • Send them to the client
      • Repeat until all blocks are read
    • the block buffer cache output
    • Repeat until no more blocks are needed
  • tell the client all the rows are read

as you can see, only a small part of the blocks of memory buffer cache is necessary by iteration, and as they can be reused, no big SGA is necessary at all.

HTH

Martin

Tags: Database

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