in which order will select * return the data?

Hi guys,.

(1) if we just do a select * from emp, it returns the data in the order data in the scope blocks. that is to return all the measurement data blocks 1, then from measure 2 and so on?
(2) if we do a select * from emp and say half of the data blocks are already in the database buffer cache, how Oracle knows that the PEM data blocks are already in the database buffer cache? He kept a correspondence table?

Thank you

OracleGuy777 wrote:
Hi guys,.

(1) if we just do a select * from emp, it returns the data in the order data in the scope blocks. that is to return all the measurement data blocks 1, then from measure 2 and so on?

I don't think that what this will be like in the same order. Hans's response is more appropriate, I think that it is the nucleus which decides the best way to access the oracle table.

(2) if we do a select * from emp and say half of the data blocks are already in the database buffer cache, how Oracle knows that the PEM data blocks are already in the database buffer cache? He kept a correspondence table?

Yes, indeed it is. The blocks are having a DBA (data block address) including the case number and the block #. This number is hashed and the key pair / generated value is used in a table comrising buckets, where each segment is the property of the value of a hash. When you say let me have access this table buffers, your server process analysis this table to see if there are already buffers for this available table. If so, it will access pads here otherwise access is reported to be done from the hard drive. To make space in the buffer cache, REPL (replace aka the LRU list) is used where the buffers are placed in the Middle using the algorithm of insertion of the median value.

Hope that this somehow :).

HTH
Aman...

Tags: Database

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