Uploading data through jdbc thin client appl to database is taking time.

Question

Hi
When application team try to upload data (excel file) through JDBC app to the database is taking too much time. When I checked through TOAD below query in background is taking too much time.
SELECT NULL AS table_cat, t.owner AS table_schem,
t.table_name AS table_name, t.column_name AS column_name,
DECODE (t.data_type,
'CHAR', 1,
'VARCHAR2', 12,
'NUMBER', 3,
'LONG', -1,
'DATE', 91,
'RAW', -3,
'LONG RAW', -4,
'BLOB', 2004,
'CLOB', 2005,
'BFILE', -13,
'FLOAT', 6,
'TIMESTAMP(6)', 93,
'TIMESTAMP(6) WITH TIME ZONE', -101,
'TIMESTAMP(6) WITH LOCAL TIME ZONE', -102,
'INTERVAL YEAR(2) TO MONTH', -103,
'INTERVAL DAY(2) TO SECOND(6)', -104,
'BINARY_FLOAT', 100,
'BINARY_DOUBLE', 101,
1111
) AS data_type,
t.data_type AS type_name,
DECODE (t.data_precision,
NULL, t.data_length,
t.data_precision
) AS column_size,
0 AS buffer_length, t.data_scale AS decimal_digits,
10 AS num_prec_radix, DECODE (t.nullable, 'N', 0, 1) AS nullable,
NULL AS remarks, t.data_default AS column_def, 0 AS sql_data_type,
0 AS sql_datetime_sub, t.data_length AS char_octet_length,
t.column_id AS ordinal_position,
DECODE (t.nullable, 'N', 'NO', 'YES') AS is_nullable
FROM all_tab_columns t
WHERE t.owner LIKE :1 ESCAPE '/'
AND t.table_name LIKE :2 ESCAPE '/'
AND t.column_name LIKE :3 ESCAPE '/'
ORDER BY table_schem, table_name, ordinal_position
All other activity on app and database is fine.
Kindly need a suggestion soon regarding this.
Thanks
SHIYAS

Answer 1

which is easier to read & understand?
SELECT NULL                                        AS table_cat,
       t.owner                                     AS table_schem,
       t.table_name                                AS table_name,
       t.column_name                               AS column_name,
       Decode (t.data_type, 'CHAR', 1,
                            'VARCHAR2', 12,
                            'NUMBER', 3,
                            'LONG', -1,
                            'DATE', 91,
                            'RAW', -3,
                            'LONG RAW', -4,
                            'BLOB', 2004,
                            'CLOB', 2005,
                            'BFILE', -13,
                            'FLOAT', 6,
                            'TIMESTAMP(6)', 93,
                            'TIMESTAMP(6) WITH TIME ZONE', -101,
                            'TIMESTAMP(6) WITH LOCAL TIME ZONE', -102,
                            'INTERVAL YEAR(2) TO MONTH', -103,
                            'INTERVAL DAY(2) TO SECOND(6)', -104,
                            'BINARY_FLOAT', 100,
                            'BINARY_DOUBLE', 101,
                            1111)                  AS data_type,
       t.data_type                                 AS type_name,
       Decode (t.data_precision, NULL, t.data_length,
                                 t.data_precision) AS column_size,
       0                                           AS buffer_length,
       t.data_scale                                AS decimal_digits,
       10                                          AS num_prec_radix,
       Decode (t.nullable, 'N', 0,
                           1)                      AS nullable,
       NULL                                        AS remarks,
       t.data_default                              AS column_def,
       0                                           AS sql_data_type,
       0                                           AS sql_datetime_sub,
       t.data_length                               AS char_octet_length,
       t.column_id                                 AS ordinal_position,
       Decode (t.nullable, 'N', 'NO',
                           'YES')                  AS is_nullable
FROM   all_tab_columns t
WHERE  t.owner LIKE :1 ESCAPE '/'
       AND t.table_name LIKE :2 ESCAPE '/'
       AND t.column_name LIKE :3 ESCAPE '/'
ORDER  BY table_schem,
          table_name,
          ordinal_position