Re: Let me be the first
Mark Jamison wrote:
> Hi Lukas,
>
> Are you saying that you have 1 composite index on col1, and col2 ?
>
> Or are you saying that you have 1 index on col1 and 1 index on col2?
I have two indexes.
One on col1 and the other on col2.
>
>
> For that matter, currently how large is each of your indices?
There are only two values for each index.
See my test SQL (table1 = dotaz, col1=status, col2=iddavky, all indexed
columns == foreing key):
begin work;
set isolation to committed read;
update dotaz set status=10 where iddavky=11000958;commit work;
begin work;
set isolation to committed read;
select * from dotaz where iddavky=11000969; -- waits until the firstthread commits
commit work;
CREATE TABLE dotaz
(
id decimal(10) PRIMARY KEY,
nazev varchar(50),
poradi decimal(10),
koddotazu varchar(20),
idsablona decimal(10),
iddavky decimal(10),
metatypchyby_id decimal(10),
status decimal(10),
errorcode decimal(3),
importch_id decimal(10)
);
INSERT INTO dotaz
(id,nazev,poradi,koddotazu,idsablona,iddavky,metatypchyby_id,status,errorcode,importch_id)
VALUES (32979,'DOTAZ_0',null,'0',2531,11000958,1,10,0,null);
INSERT INTO dotaz
(id,nazev,poradi,koddotazu,idsablona,iddavky,metatypchyby_id,status,errorcode,importch_id)
VALUES (32980,'DOTAZ_1',null,'1',2532,11000958,1,10,0,null);
INSERT INTO dotaz
(id,nazev,poradi,koddotazu,idsablona,iddavky,metatypchyby_id,status,errorcode,importch_id)
VALUES (33026,'DOTAZ_23',null,'23',2532,11000969,1,110,0,null);
INSERT INTO dotaz
(id,nazev,poradi,koddotazu,idsablona,iddavky,metatypchyby_id,status,errorcode,importch_id)
VALUES (33027,'DOTAZ_24',null,'24',2531,11000969,1,110,0,null);
CREATE INDEX 109_96 ON dotaz(status);
CREATE INDEX 109_95 ON dotaz(idsablona);
CREATE INDEX 109_94 ON dotaz(iddavky);
CREATE INDEX 109_93 ON dotaz(importch_id);
CREATE INDEX 109_92 ON dotaz(metatypchyby_id);