Need help about distributed sql statement

Hello everybody
Enviroment:
Oracle 11g R1.
This Database was fine, 'till some days ago that a new system was deployed on other database. New system runs some SELECT querys to a my database using db_links. These statements are blocking some resources and 'cause that they are blocking many users of my database. I can see on Enterprise Manager this wait event : "enq: TM contention".
Now my question is, why are these querys are blocking resources and users if they are only of type SELECT??? I thought that querys that did this were DML and DDL statements.
Does this behavior is related with that those querys are executed by a distributed way (using dblinks)??
Thanks a lot

user652447 wrote:
Distributed Transactions require commit even if a Select. See the following FAQ post from Jonathan Lewis for some basic information.
http://www.jlcomp.demon.co.uk/faq/dblink_commit.html
HTHNot always true though, it depends. The article you are linking to is quite old and covers, as stated, Oracle version(s): 7.0 – 9.2. Whereas the OP is on 11.
http://download.oracle.com/docs/cd/B10500_01/server.920/a96521/ds_txns.htm
In the section "Read-Only Response"
Note that if a distributed transaction is set to read-only, then it does not use rollback segments. If many users connect to the database and their transactions are not set to READ ONLY, then they allocate *rollback space* even if they are only performing queries.
In the OP's version
http://download.oracle.com/docs/cd/E11882_01/server.112/e17120/ds_txns003.htm#ADMIN12226
Note that if a distributed transaction is set to read-only, then it does not use undo segments. If many users connect to the database and their transactions are not set to READ ONLY, then they allocate *undo space* even if they are only performing queries.
However that doesn't account for the types of lock the OP is experiencing.

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