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Can a select block other queries?

edited Sep 8, 2015 1:20PM in Database Administration (MOSC) 5 commentsAnswered ✓

hi experts.

I have this Blocking list but, I don't know why a select can block other sessions.

=====================================================

Block / Is blocked SID        INST_ID OBJECT TIME(secs) ROWID CLIENT_IDENTIFIER

------------------------- ---------  ------- ------------------------------ ---------- ------------

LTSADMIN 39        1 UNKNOWN 688

LTSADMIN 34        1 UNKNOWN 0

LTSADMIN 30        1 UNKNOWN                                 4

PL/SQL procedure successfully completed.

SID USERNAME COMMAND LOCKWAIT STATUS   OSUSER

---------- ------------------------------ ---------- ---------------- -------- ---------------------

SQL_TEXT

----------------------------------------------------------------------------------------------------

34 LTSADMIN 0 070000006CB32980 ACTIVE   oracle

BEGIN dbms_snapshot.refresh('LINECARD_S','F'); END;

SQL> /

Enter value for usrsid: 39

SID USERNAME COMMAND LOCKWAIT STATUS   OSUSER

---------- ------------------------------ ---------- ---------------- -------- ---------------------

SQL_TEXT

----------------------------------------------------------------------------------------------------

39 LTSADMIN 3 ACTIVE   oracle

SELECT /*+ remote_mapped(AAIS.WORLD) */ CURRENT$."LC_TELNUM",CURRENT$."LC_TWNCD",CURRENT$."LC_SWITCH

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