Why can't I change the data in the table that is locked in SHARE mode?

Hi gurus,

Oracle Database 11g Enterprise Edition Release 11.2.0.1.0
--
I'm confused by the Oracle locking mechanism, here I'm talking about locking TM. We know that there are several lock TM modes:
SS
SX
S
SSX
X
I have several questions about these modes, for example, the third argument of ', I know S average share, and in my view, table is locked in shared mode, because the people do not want everyone encountering DDL, if this is true, why can't I just run DML against it either? In other words, why does SX and S compatible mode. And S-mode mean?
SESS#1 SQL> lock table t_lock_4 in share mode;

Table(s) locked

SESS#2 SQL> update t_lock_4 set val='aa' where id=1; --this sql hangs
Thanks in advance.

>
I know S average share, and in my view, table is locked in shared mode, because the people do not want everyone encountering DDL, if this is true, why can't I just run DML against it either? In other words, why does SX and S compatible mode. And S-mode mean?
>
The quote from doc tells you which mode S means.
>
in my view, table is locked in shared mode, because the people do not want everybody to face DDL, if this is true
>
Well - which is not true as says the quote from doc. As the doc says the of ' means "action, table lock" - share the table. If several sessions to share the table any of the sessions can be updated.

SX and S are not compatible because the of ' is a table lock and "SX" is a line lock. If a session snaps a row then this session MAY update the line even if other sessions have locks on the other lines. Several sessions may lock the different lines and update.

But as the doc said ' means sharing the table and you can only update it is you're the only session the ' lock.

Tags: Database

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