How to implement optional query parameters












0















I have a relatively big (10^7 rows and growing) table and I want to query some rows from it.
Since table is this big - I want to use every perfomance boost that I can.



My query have optional parameter (let's call it agent_id) - it may be NULL or may have some numeric value.
The column agent_id in table is NOT NULL.



I have thought of two ways to create such a query, here are simplified examples:



Query 1:



select c.agent_id,
c.date_time
from calls c
where 1 = 1
and c.agent_id = nvl(agent_id$i, c.agent_id)


Query 2:



select c.agent_id,
c.date_time
from calls c
where 1 = 1
and (
user_id$i is null
or
user_id$i is not null and c.agent_id = user_id$i
)


Is there any perfomance advantage for either one?



I guessed that second one will be slightly faster, because it can evaluate only half of expression, excluding the need to evaluate other half - but it's only a guess, and I want to hear what experts have to say about this issue.









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    0















    I have a relatively big (10^7 rows and growing) table and I want to query some rows from it.
    Since table is this big - I want to use every perfomance boost that I can.



    My query have optional parameter (let's call it agent_id) - it may be NULL or may have some numeric value.
    The column agent_id in table is NOT NULL.



    I have thought of two ways to create such a query, here are simplified examples:



    Query 1:



    select c.agent_id,
    c.date_time
    from calls c
    where 1 = 1
    and c.agent_id = nvl(agent_id$i, c.agent_id)


    Query 2:



    select c.agent_id,
    c.date_time
    from calls c
    where 1 = 1
    and (
    user_id$i is null
    or
    user_id$i is not null and c.agent_id = user_id$i
    )


    Is there any perfomance advantage for either one?



    I guessed that second one will be slightly faster, because it can evaluate only half of expression, excluding the need to evaluate other half - but it's only a guess, and I want to hear what experts have to say about this issue.









    share







    New contributor




    fen1x is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.























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      0








      I have a relatively big (10^7 rows and growing) table and I want to query some rows from it.
      Since table is this big - I want to use every perfomance boost that I can.



      My query have optional parameter (let's call it agent_id) - it may be NULL or may have some numeric value.
      The column agent_id in table is NOT NULL.



      I have thought of two ways to create such a query, here are simplified examples:



      Query 1:



      select c.agent_id,
      c.date_time
      from calls c
      where 1 = 1
      and c.agent_id = nvl(agent_id$i, c.agent_id)


      Query 2:



      select c.agent_id,
      c.date_time
      from calls c
      where 1 = 1
      and (
      user_id$i is null
      or
      user_id$i is not null and c.agent_id = user_id$i
      )


      Is there any perfomance advantage for either one?



      I guessed that second one will be slightly faster, because it can evaluate only half of expression, excluding the need to evaluate other half - but it's only a guess, and I want to hear what experts have to say about this issue.









      share







      New contributor




      fen1x is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.












      I have a relatively big (10^7 rows and growing) table and I want to query some rows from it.
      Since table is this big - I want to use every perfomance boost that I can.



      My query have optional parameter (let's call it agent_id) - it may be NULL or may have some numeric value.
      The column agent_id in table is NOT NULL.



      I have thought of two ways to create such a query, here are simplified examples:



      Query 1:



      select c.agent_id,
      c.date_time
      from calls c
      where 1 = 1
      and c.agent_id = nvl(agent_id$i, c.agent_id)


      Query 2:



      select c.agent_id,
      c.date_time
      from calls c
      where 1 = 1
      and (
      user_id$i is null
      or
      user_id$i is not null and c.agent_id = user_id$i
      )


      Is there any perfomance advantage for either one?



      I guessed that second one will be slightly faster, because it can evaluate only half of expression, excluding the need to evaluate other half - but it's only a guess, and I want to hear what experts have to say about this issue.







      oracle oracle-11g-r2





      share







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      share







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      Check out our Code of Conduct.








      share



      share






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      asked 3 mins ago









      fen1xfen1x

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      1011




      New contributor




      fen1x is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      New contributor





      fen1x is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






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      Check out our Code of Conduct.






















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