How to implement optional query parameters
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
asked 3 mins ago
fen1xfen1x
1011
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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
asked 3 mins ago
fen1xfen1x
1011
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.
add a comment |
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
asked 3 mins ago
fen1xfen1x
1011
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
oracle oracle-11g-r2
asked 3 mins ago
fen1xfen1x
1011
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.
asked 3 mins ago
fen1xfen1x
1011
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.
asked 3 mins ago
fen1xfen1x
1011
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.
asked 3 mins ago
fen1xfen1x
1011
asked 3 mins ago
fen1xfen1x
1011
1011
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.
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.
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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