How to detect changes to stop Oracle

Hello

I have a question on how Oracle detects data committed themselves and stop this datafle...

Scenario - 1
-----------------
session 1
------------
Suppose that a Transaction_1 started at 08:30 that contains a select as "SELECT * FROM TABLE" (assuming this query will run for 15 minutes - time to end execution will be 08:45).
session 2
-------------
Then another session, I changed some of the values of the same table (Transaction_1), and I watched the change at 8.35 AM and also comiitted those
changes at 08:40.

As we know each statement is view coherent reading, and each instruction is associated with the number of SNA. Select start of session 1, it will read the data block / who
a number less than SNA number associated with the statement select Yvert.

As the session 2, I modified some data block, so updated the block displays the highest number of SNA SNA number associated with SNA to select session 1
In this case updated block with plu Yvert that select associate SNA session 1, will be read / reconsructed the tablespace undo to give a coherent picture of data to
the selection running on the session 1.

My question is "how coherent reading that happens in the case the other way around? (let me explain in scenario 2)

Scenario 2
--------------

session 1
-------------
at 8:30 I have modified the contents of the table and do not put an end to the transaction (committed or cancelled neigther)


session2
-----------
08:35, I play a select on the table changed on the session 1.

In this session, only committed changes will be picked who did the select query to boot.

My question is, in this case, how oracle detects changes contains who did before SNA of select statement.

Thank you

user9085814 wrote:
Hello

I have a question on how Oracle detects data committed themselves and stop this datafle...

Scenario - 1
-----------------
session 1
------------
Suppose that a Transaction_1 started at 08:30 that contains a select as "SELECT * FROM TABLE" (assuming this query will run for 15 minutes - time to end execution will be 08:45).
session 2
-------------
Then another session, I changed some of the values of the same table (Transaction_1), and I watched the change at 8.35 AM and also comiitted those
changes at 08:40.

As we know each statement is view coherent reading, and each instruction is associated with the number of SNA. Select start of session 1, it will read the data block / who
a number less than SNA number associated with the statement select Yvert.

As the session 2, I modified some data block, so updated the block displays the highest number of SNA SNA number associated with SNA to select session 1
In this case updated block with plu Yvert that select associate SNA session 1, will be read / reconsructed the tablespace undo to give a coherent picture of data to
the selection running on the session 1.

My question is "how coherent reading that happens in the case the other way around? (let me explain in scenario 2)

Scenario 2
--------------

session 1
-------------
at 8:30 I have modified the contents of the table and do not put an end to the transaction (committed or cancelled neigther)

session2
-----------
08:35, I play a select on the table changed on the session 1.

In this session, only committed changes will be picked who did the select query to boot.

My question is, in this case, how oracle detects changes contains who did before SNA of select statement.

The block is checked in correlation with the table of transaction if there of what the status of the transaction. Mind that when you post, the information is the first recorded in the transactions table that the block can be there in the buffer cache or maybe not (checkpointed). If there is no Commit not recorded in the table for the block, it is called uncommitted.

Aman...

Tags: Database

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