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IDS Forum

help with query plan

Posted By: Floyd Wellershaus
Date: Friday, 13 May 2005, at 7:48 a.m.

Below is the sqexplain output for a query, and below that is the schema for the table in question.
I don't understand why this is doing a sequential scan on the scprofil table. It is not doing this on the development box, that has the exact same schema.
I ran the required update statistics on scprofil, and it still does the sequential scan and uses the auto index path.

I am thinking that if I put an index on scp.state, then it won't, but I still would like to understand why this is happening, plus I want to be sure about the index, before I lock up the production table by creating the index.

Any ideas would be appreciated.

Thanks

QUERY:
------
SELECT sen_scprofil_token, sen_schl_code, sen_schl_branch,
sen_schl_name, scp.state, count(*) num_recs FROM T11752 sub,
scprofil scp WHERE output_flag = 'Y' AND rejectflag = 'N' AND
sen_schl_code = scp.schl_code AND sen_schl_branch = scp.schl_branch
AND sub.token = src_token GROUP BY sen_scprofil_token, sen_schl_code,
sen_schl_branch, sen_schl_name,scp.state ORDER BY num_recs DESC,
scp.state ASC

Estimated Cost: 551194
Estimated # of Rows Returned: 1
Maximum Threads: 5
Temporary Files Required For: Order By Group By
1) root.scp: SEQUENTIAL SCAN
2) root.sub: AUTOINDEX PATH
Filters:
Table Scan Filters: ((root.sub.token = root.sub.src_token AND root.sub.output_flag = 'Y' ) AND root
.sub.rejectflag = 'N' )
(1) Index Keys: sen_schl_code sen_schl_branch
Lower Index Filter: (root.sub.sen_schl_code = root.scp.schl_code AND root.sub.sen_schl_branch = roo
t.scp.schl_branch )
NESTED LOOP JOIN

sql for table scprofile is:
{ TABLE "sentrycf".scprofil row size = 897 number of columns = 53 index size = 83
}
create table "sentrycf".scprofil
(
token integer not null ,
name char(50) not null ,
short_name char(15),
schl_code char(6) not null ,
schl_branch char(2) not null ,
type char(1) not null ,
college_type char(1),
tin_school_flag char(1)
default 'N' not null ,
alt_ssn_range varchar(50)
default null,
sch_city varchar(20),
state char(2),
member_status char(1) not null ,
closed_flag char(1)
default 'N' not null ,
member_start_dt date,
data_since_dt date,
stdt_population integer,
num_enrollees integer not null ,
software_used char(15) not null ,
tt_participant char(1) not null ,
tt_mbprofil_token integer,
schl_block_rpt char(1) not null ,
oedo_block_rpt char(1) not null ,
block_email char(1) not null ,
dbi_programmed char(1) not null ,
dbi_percent_allow integer,
priority_flag char(1) not null ,
perkins_flat_rate char(1) not null ,
contract_type varchar(15),
es_paid_through_dt date,
es_ntf_tape_spec varchar(150),
commercial_verify char(1) not null ,
enrollstat_release char(1),
address_release char(1),
sss_participant char(1)
default 'N' not null ,
sss_enable_to_only char(1)
default 'N' not null ,
sss_ec_agd char(1)
default 'N' not null ,
sss_ec_notes_token integer,
to_participant char(1)
default 'N' not null ,
to_active_dt date,
ev_trans_fee money(16,2)
default 0.00 not null ,
ev_block_public char(1)
default 'N' not null ,
dv_participant char(1),
dv_scprofil_token integer,
dv_gen_grad_file char(1)
default 'N' not null ,
dv_data_since_dt date,
dv_trans_fee money(16,2)
default 0.00 not null ,
dv_active_dt date,
dv_refers_requests char(1) not null ,
dv_block_autoemail char(1)
default 'N' not null ,
cv_contact_phrase varchar(200),
standing_instr varchar(255),
operator_id char(9) not null ,
timestamp datetime year to second not null
) in schl_dat extent size 1536 next size 256 lock mode page;
revoke all on "sentrycf".scprofil from "public";

create unique index "sentrycf".scprofil_x01 on "sentrycf".scprofil
(token) using btree in table ;
create unique index "sentrycf".scprofil_x02 on "sentrycf".scprofil
(schl_code,schl_branch) using btree in table ;
create index "sentrycf".scprofil_x03 on "sentrycf".scprofil (name)
using btree in table ;
create index "sentrycf".scprofil_x04 on "sentrycf".scprofil (member_status)
using btree in table ;

Messages In This Thread

  • help with query plan
    Floyd Wellershaus -- Friday, 13 May 2005, at 7:48 a.m.

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