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Simple function returning Parallel slave info

Posted on September 15, 2020 by Sayan Malakshinov Posted in oracle, parallel, query optimizing, SQL, statistics, troubleshooting Leave a comment

You can add also any information from v$rtsm_sql_plan_monitor if needed

create or replace function px_session_info return varchar2 parallel_enable as
   vSID int;
   res varchar2(30);
begin
   vSID:=userenv('sid');
   select 
           to_char(s.server_group,'fm000')
    ||'-'||to_char(s.server_set,'fm0000')
    ||'-'||to_char(s.server#,'fm0000')
    ||'('||s.sid||','||s.degree||'/'||s.req_degree||')'
    into res
   from v$px_session s 
   where s.sid=vSID;
   return res;
exception when no_data_found then
   return 'no_parallel';
end;
/

Simple example:

select--+ parallel
  px_session_info, count(*)
from sys.obj$
group by px_session_info
/
PX_SESSION_INFO           COUNT(*)
------------------------  --------
001-0002-0001(630,2/2)     38298
001-0002-0002(743,2/2)     34706
oracle parallel presentations troubleshooting

My presentations from RuOUG meetups

Posted on November 20, 2019 by Sayan Malakshinov Posted in oracle Leave a comment

I forgot to share my files from presentations, so I’m going to keep them here:

8-sql-2596013-Использование-некоторых-новых-возможностей-SQLCBO-в-12сDownload
Intra-block-row-chaining(RuOUG)Download
Intra-block-row-chaining(RuOUG).pptxDownload
Когда-выбирается-план-с-большим-COSTDownload
Sayan Malakshinov. CBO – Query Transformations(RuOUG)Download

oracle presentations
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