RE: Database link performance

[Gogala, Mladen]

Title: Message

Level 8? I was using level 10 for all events. -----Original Message----- From: Cary Millsap [mailto:[EMAIL PROTECTED]] Sent: Tuesday, June 04, 2002 1:33 PM To: Multiple recipients of list ORACLE-L Subject: RE: Database link performance Use a 10046 level-8 trace, and the resulting trace file will show what is significantly impacting your time. I would expect it’s either the time tallied to “SQL*Net message from dblink” or a difference in execution plans.     Cary Millsap Hotsos Enterprises, Ltd. [EMAIL PROTECTED] http://www.hotsos.com   -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Michael Rosenblum Sent: Tuesday, June 04, 2002 11:18 AM To: Multiple recipients of list ORACLE-L Subject: Database link performance   Hi,   Could anybody help me with the database link problem?   I have two databases db_A and db_B, and link from db_A to db_B.   In the database db_B there is table B with 1.6 million records.   I created simple test to query data from the table B via database link (I am connected to db_A) ------------------------------------- declare    v_record B%rowtype;      cursor cB    is    select *    from [EMAIL PROTECTED]    where rownum < 20000; begin    for c in cB    loop      v_record :=c;    end loop; end; -------------------------------   I tried to check performance of data querying through the link, so I had two tests: - via the link – 19.8 sec - locally        –   1.5 sec   Difference is too large, as far as I can expect! I have been REALLY surprised.   At this time there was mostly no other activity on the network (databases are on the same subnet, at the same hierarchical level).   Could anybody explain is it normal results?   Thanks,   Michael Rosenblum, Dulcian Inc.