Why SESSION 1 can see the line update?

--- SESSION 1
SQL> select * from test;
ID         NAME
-----     --------
1          A
2          B
3          C
SQL> update test set name = 'D' where id = 1;
1 rows updated
SQL> 
SQL> rem  uncommitted this transaction
SQL>
SQL> select * from test;
ID         NAME
-----     --------
1          D
2          B
3          C

---- SESSION 2
SQL>
SQL> select * from test;
ID         NAME
-----     --------
1          A
2          B
3          C
SQL>
SQL>
Question:
Why SESSION 1 can see the line update? If the transaction had not been validated. before you see the updated row, which the database to submit to win the line?
I know that SESSION 2 can not see the update line, since it occurs compatible read.

Lonion wrote:

--- SESSION 1
SQL> select * from test;
ID         NAME
-----     --------
1          A
2          B
3          C
SQL> update test set name = 'D' where id = 1;
1 rows updated
SQL>
SQL> rem  uncommitted this transaction
SQL>
SQL> select * from test;
ID         NAME
-----     --------
1          D
2          B
3          C

---- SESSION 2
SQL>
SQL> select * from test;
ID         NAME
-----     --------
1          A
2          B
3          C
SQL>
SQL>

Question:
Why SESSION 1 can see the line update? If the transaction had not been validated. before you see the updated row, which the database to submit to win the line?

SESSION 1 can see the data that changed since the SESSION 1 fact change.

I know that SESSION 2 can not see the update line, since it occurs compatible read.

Tags: Database

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