Oracle – Calculating Time Elapsed

oracletime

I need to calculated time elapsed for each user to perform his part in a transaction.

The sequence is: 0 -1 – B2 or 0-B3
The table looks like the following:

+--------+--------+-------------------+------------------+-----------+
| id     | Trtype |Internal Status    | Timestamp        | User Name |
+--------+--------+-------------------+------------------+-----------+
|2072499 | BSE100 | 0                 | 03/06/2014 13:33 | User1     |
|2072499 | BSE100 | 1                 | 04/06/2014 08:53 | User2     |
|2072499 | BSE100 |B2                 | 03/06/2014 13:33 | User3     |
|2072605 | BSE100 | 0                 | 03/06/2014 13:33 | User1     |
|2072605 | BSE100 |B3                 | 03/06/2014 13:33 | User3     |
.....................

I am using the following sql query to generate the table above:

select h.id, h.trtype, T.DESCRIPTION, hist.internal_status,
 ts.description status_Desc, h.val_dte, h.account_dte, 
 hist.signature_timestamp, usr.login_name as user_name
  from k$transaction_header h, k$transtypes t, k$transaction_history hist, k$usr usr, K$TRANSACTION_STATUS ts
 where h.trtype = t.trtype
 and hist.trans_id = h.id
 and usr.id=hist.signature_usr
 and ts.id=hist.internal_status
 AND H.ACCOUNT_DTE = TO_DATE(&DATE_YYYYMMDD, 'yyyymmdd')
 order by h.id, hist.internal_status

Best Answer

Try this. Logically it's a self-join.

WITH transaction_user_parts AS
(
   select h.id, h.trtype, T.DESCRIPTION, hist.internal_status,
   ts.description status_Desc, h.val_dte, h.account_dte, 
   hist.signature_timestamp, usr.login_name as user_name
    from k$transaction_header h, k$transtypes t, k$transaction_history hist, k$usr usr, K$TRANSACTION_STATUS ts
   where h.trtype = t.trtype
   and hist.trans_id = h.id
   and usr.id=hist.signature_usr
   and ts.id=hist.internal_status
   AND H.ACCOUNT_DTE = TO_DATE(&DATE_YYYYMMDD, 'yyyymmdd')
)
SELECT  t1.id
      , t1.internal_status || ' -> ' || t2.internal_status internal_status_change
      , t2.user_name
      , (t2.signature_timestamp - t1.signature_timestamp) time_elapsed
FROM transaction_user_parts t1
JOIN transaction_user_parts t2
  ON (t1.id = t2.id
       AND t1.signature_timestamp <= t2.signature_timestamp
       AND (
             (t1.internal_status='0' AND t2.internal_status='1')
            OR
             (t1.internal_status='1' AND t2.internal_status='B2')
            OR
             (t1.internal_status='0' AND t2.internal_status='B3')
           )
      );

Related Solutions

V$SQL table elapsed time

From the 11.2 Database Reference documentation:

Elapsed time (in microseconds) used by this cursor for parsing, executing, and fetching

Here is a demonstration:

SQL> SELECT sql_text, elapsed_time FROM v$sql WHERE sql_text like '%lewap %';

SQL_TEXT
-----------------------------------------------------------------------------
ELAPSED_TIME
------------
SELECT sql_text, elapsed_time FROM v$sql WHERE sql_text like '%lewap %'
        5112


SQL> SELECT sql_text, elapsed_time FROM v$sql WHERE sql_text like '%lewap %';

SQL_TEXT
-----------------------------------------------------------------------------
ELAPSED_TIME
------------
SELECT sql_text, elapsed_time FROM v$sql WHERE sql_text like '%lewap %'
       26332


SQL> SELECT sql_text, elapsed_time FROM v$sql WHERE sql_text like '%lewap %';

SQL_TEXT
-----------------------------------------------------------------------------
ELAPSED_TIME
------------
SELECT sql_text, elapsed_time FROM v$sql WHERE sql_text like '%lewap %'
       65886


SQL> SELECT sql_text, elapsed_time FROM v$sql WHERE sql_text like '%lewap %';

SQL_TEXT
-----------------------------------------------------------------------------
ELAPSED_TIME
------------
SELECT sql_text, elapsed_time FROM v$sql WHERE sql_text like '%lewap %'
      103225

If you need the timing for one execution you could set timing on in an SQL*Plus session, turn on tracing with TIMED_STATISTICS, or add a comment to the SQL so that there is only one execution in v$sql.

Limiting Generated Sequence Values in Multi-table Insert

This can be done in a single statement, but you have to wrap the sequence call in a function.

By calling a function in the select (as opposed to the sequence directly), you overcome the problem of getting ORA-02287 errors. However, the function will be called once for each row in A, which is not what you want.

This can be overcome by defining the function as deterministic. This allows Oracle to optimize the function so it is only executed once for each distinct parameter value passed in. To make this work in this case, you'll need to pass in ceil(x/2):

create or replace function f(p integer) return number deterministic  as
  l_retval pls_integer;
begin
  select my_seq.nextval into l_retval from dual;
  return l_retval;
end;
/

insert all 
    when mod(x,2) = 0 then
        into b (val) values (seq)
        into c (val) values (seq)
    else 
        into c (val) values (seq)
select x, f(ceil(x/2)) seq from a;


select * from b;

VAL
---
  1 
  2 

select * from c;

VAL
---
  1 
  2 
  1 
  2

Best Answer

Related Solutions

V$SQL table elapsed time

Limiting Generated Sequence Values in Multi-table Insert

Related Question