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Oracle RACÐÔÄÜ Oracle sequence ÐÔÄܲâÊÔ

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drop sequence test_rac;
create sequence test_rac;
set timing on
declare
  dummy number;
begin
for i in 1..50000 loop
  select test_rac.nextval into dummy from dual;
end loop;
end;
/
cache 20, non-ordered
one instance - 2.46 seconds
two instance - 6.20 seconds
drop sequence test_rac;
create sequence test_rac order;
set timing on
declare
  dummy number;
begin
for i in 1..50000 loop
  select test_rac.nextval into dummy from dual;
end loop;
end;
/
cache 20, ordered
one instance - 5.29 seconds
two instance - 13.30 seconds
drop sequence test_rac;
CREATE SEQUENCE test_rac
 CACHE 1000;
set timing on
declare
  dummy number;
begin
for i in 1..50000 loop
  select test_rac.nextval into dummy from dual;
end loop;
end;
/
cache 1000, non-ordered
one instance - 1.16 seconds
two instance - 1.54 seconds
drop sequence test_rac;
CREATE SEQUENCE test_rac
 CACHE 1000 ORDER;
set timing on
declare
  dummy number;
begin
for i in 1..50000 loop
  select test_rac.nextval into dummy from dual;
end loop;
end;
/
cache 1000, ordered
one instance - 3.46 seconds
two instance - 8.47 seconds


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