On Sat, 1 Feb 2014 11:21:45 -0500
Stephen Chrzanowski pontia...@gmail.com wrote:
Would be interesting to see when and where that single index comes
into play when multiple indexes are defined.
create table T (t int primary key, a int , b int);
create index Ta on T(a);
create index Tb on T(b);
You mean, of course, doing a re-write as:
select *
from T
where rowid in (select rowid
from T
where a 1
UNION
select rowid
from T
where b 1)
which uses four indices. one on a, one
On Feb 2, 2014, at 5:55 PM, Keith Medcalf kmedc...@dessus.com wrote:
Nevertheless, each traversal operation is only using one index at a time.
One word: bitmap. As in bitmap index:
http://www.oracle.com/technetwork/articles/sharma-indexes-093638.html
http://en.wikipedia.org/wiki/Bitmap_index
Hello Simon,
Below is the query, and the schema I’m trying to debug.
FYI: I’m signed up for the daily digest, so please CC
kla...@hach.commailto:kla...@hach.com on replies for a faster response.
CREATE TABLE userParameter (
hepi_parameter_id INT NOT NULL
On 02/02/2014 11:16 PM, James K. Lowden wrote:
On Sat, 1 Feb 2014 11:21:45 -0500
Stephen Chrzanowski pontia...@gmail.com wrote:
Would be interesting to see when and where that single index comes
into play when multiple indexes are defined.
create table T (t int primary key, a int , b int);
