sql - Oracle Index not being used when joining to another table -



sql - Oracle Index not being used when joining to another table -

i have next sql beingness run on oracle 10g database:

select /*+ all_rows */ to_number(cv.old_value) cv_id, to_number(job.old_value) job_id amendments, amnddets cv, amnddets job amendments.table_name = 'timesheet_layer' , amendments.dml_type = 'd' , cv.amnd_id = amendments.amnd_id , cv.column_name = 'cv_id' , job.amnd_id = amendments.amnd_id , job.column_name = 'job_id';

there next indexes have been created:

create index amendments_dmp_type_upper on amendments upper(dmp_type); create index amendments_table_name_upper on amendments upper(table_name); create index amendments_pk on amendments (amnd_id); create index amended_column_name_idx on amnddets (column_name); create index amnddets_amnd_id_idx on amnddets (amnd_id);

i have tried using ansi joins (the below sql) not utilize indexes either, placing upper() around table_name , dml_type has no affect.

the above query taking approximately 30 - 40 secs retrieve around 2500 rows.

i looked @ explain plan , can't see index on amendments table_name , dml_type beingness used.

below ansi explain plan for:

select /*+ all_rows */ to_number(cv.old_value) cv_id, to_number(job.old_value) job_id amendments bring together amnddets cv on cv.amnd_id = amendments.amnd_id , cv.column_name = 'cv_id' bring together amnddets job on job.amnd_id = amendments.amnd_id , job.column_name = 'job_id' upper(amendments.table_name) = 'timesheet_layer' , amendments.dml_type = 'd';

could 1 advise why table_name, dml_type , column_name indexes aren't beingness used in above query?

if have run say:

create index amendments_dmp_type_upper on amendments upper(dmp_type);

then have created index on amendments(dmp_type) without upper function!

the right syntax is:

create index amendments_dmp_type_upper on amendments (upper(dmp_type));

perhaps surprisingly, statement works word "upper" treated table alias - works too:

create index amendments_dmp_type_upper on amendments foo(dmp_type);

sql oracle10g indexing

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