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Hogan, Brian P.

2006-Jan-11 19:28 UTC

[Rails] Oracle and Rails seems really slow.... In development

I''m just looking into how to connect to Oracle using Rails. 
I''ve got
everything connecting and working as it should.

I have a Users table in Oracle:

  create_table "users", :force => true do |t|
    t.column "username", :string
    t.column "created_on", :datetime
    t.column "email", :string
    t.column "note", :text
  end

And everything works fine, but in development, it has to run this query
for each view

select column_name, data_type, data_default, nullable,
 decode(data_type, ''NUMBER'', data_precision,
 ''VARCHAR2'', data_length,
 null) as length,
 decode(data_type, ''NUMBER'', data_scale, null) as scale
 from user_catalog cat, user_synonyms syn, all_tab_columns col
 where cat.table_name = ''USERS''
 and syn.synonym_name (+)= cat.table_name
 and col.table_name = nvl(syn.table_name, cat.table_name)
 and col.owner = nvl(syn.table_owner, user)

I am assuming that this is because development mode can''t cache the
models... in production mode it seems to take about 8 seconds the first
time but then it''s really fast.

To test, I''ve placed this into SQLPlus and it takes about 6 seconds to
execute there as well.

Is this something that others are experiencing? I''m seeing 6-7 seconds
delay between requests because of this query running on all of my view
pages. Is there something that can be done or is the price of doing
business with Oracle? :)


Brian Hogan
Web Development
Learning & Technology Services
Schofield 3-B
University of Wisconsin-Eau Claire
715 836 3585
hoganbp@uwec.edu

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Wilson Bilkovich

2006-Jan-13 19:49 UTC

head link

[Rails] Oracle and Rails seems really slow.... In development

On 1/11/06, Hogan, Brian P. <HOGANBP@uwec.edu>
wrote:>
>
> I''m just looking into how to connect to Oracle using Rails. 
I''ve got
> everything connecting and working as it should.
>
> I have a Users table in Oracle:
>
>   create_table "users", :force => true do |t|
>     t.column "username", :string
>     t.column "created_on", :datetime
>     t.column "email", :string
>     t.column "note", :text
>   end
>
> And everything works fine, but in development, it has to run this query for
> each view
>
> select column_name, data_type, data_default, nullable,
>  decode(data_type, ''NUMBER'', data_precision,
>  ''VARCHAR2'', data_length,
>  null) as length,
>  decode(data_type, ''NUMBER'', data_scale, null) as scale
>  from user_catalog cat, user_synonyms syn, all_tab_columns col
>  where cat.table_name = ''USERS''
>  and syn.synonym_name (+)= cat.table_name
>  and col.table_name = nvl(syn.table_name, cat.table_name)
>  and col.owner = nvl(syn.table_owner, user)
>
> I am assuming that this is because development mode can''t cache
the models?
> in production mode it seems to take about 8 seconds the first time but then
> it''s really fast.
>
> To test, I''ve placed this into SQLPlus and it takes about 6
seconds to
> execute there as well.
>
> Is this something that others are experiencing? I''m seeing 6-7
seconds delay
> between requests because of this query running on all of my view pages. Is
> there something that can be done or is the price of doing business with
> Oracle? :)
>
The default query is very, very slow, partly because it has to account
for all the different possible ways you might have configured your
tables.
In my case, I just make a user synonym on the user Rails is logging in
as, in development.
Then, in my development environment.rb, include something like this,
which overrides the query.

module ActiveRecord
  module ConnectionAdapters
    class OCIAdapter < AbstractAdapter
      def columns(table_name, name = nil)
          table_cols = <<-SQL_CODE
            select column_name, data_type, data_default, nullable,
              decode(data_type, ''NUMBER'', data_precision,
''VARCHAR2'',
              data_length, null) as length,
              decode(data_type, ''NUMBER'', data_scale, null) as
scale
             from user_synonyms syn
             join all_tab_columns col on syn.table_name = col.table_name
             where syn.table_name = #{table_name.to_s.upcase}
             and col.owner = nvl(syn.table_owner, user) }
          SQL_CODE

          select_all(table_cols, name).map do |row|
           
row[''data_default''].sub!(/^''(.*)''\s*$/,
''\1'') if row[''data_default'']
            OCIColumn.new(
              oci_downcase(row[''column_name'']),
              row[''data_default''],
              row[''data_type''],
              row[''length''],
              row[''scale''],
              row[''nullable''] == ''Y'')
          end
      end
    end
  end
end

Hogan, Brian P.

2006-Jan-13 20:15 UTC

head link

[Rails] Oracle and Rails seems really slow.... In development

Neat!
>From my findings, though.... This is what I noticed:
The original code:

	          table_cols = %Q{
	            select column_name, data_type, data_default,
nullable,
	                   decode(data_type, ''NUMBER'',
data_precision,
	                                     ''VARCHAR2'', data_length,
	                                      null) as length,
	                   decode(data_type, ''NUMBER'', data_scale,
null)
as scale
	              from #{scope}_catalog cat, #{scope}_synonyms syn,
all_tab_columns col
	             where cat.table_name = #{table}
	               and syn.synonym_name (+)= cat.table_name
	               and col.table_name = nvl(syn.table_name,
cat.table_name)
	               and col.owner = nvl(syn.table_owner, #{(scope ="all" ?
"cat.owner" : "user")}) }



My version



	          table_cols = %Q{
	            select column_name, data_type, data_default,
nullable,
	                   decode(data_type, ''NUMBER'',
data_precision,
	                                     ''VARCHAR2'', data_length,
	                                      null) as length,
	                   decode(data_type, ''NUMBER'', data_scale,
null)
as scale
	              from #{scope}_catalog cat, #{scope}_synonyms syn,
all_tab_columns col
	             where col.table_name = #{table}
	               and syn.synonym_name (+)= cat.table_name
	               and col.table_name = nvl(syn.table_name,
cat.table_name)
	               and col.owner = nvl(syn.table_owner, #{(scope ="all" ?
"cat.owner" : "user")}) }



Runs no problem.

I just changed 

where cat.table_name = #{table}

To 
where col.table_name = #{table}


Since the ALL_TAB_COLUMNS has the table name, this works great.... And
this fix makes it just fly!


-----Original Message-----
From: rails-bounces@lists.rubyonrails.org
[mailto:rails-bounces@lists.rubyonrails.org] On Behalf Of Wilson
Bilkovich
Sent: Friday, January 13, 2006 1:49 PM
To: rails@lists.rubyonrails.org
Subject: Re: [Rails] Oracle and Rails seems really slow.... In
development


On 1/11/06, Hogan, Brian P. <HOGANBP@uwec.edu>
wrote:>
>
> I''m just looking into how to connect to Oracle using Rails. 
I''ve got
> everything connecting and working as it should.
>
> I have a Users table in Oracle:
>
>   create_table "users", :force => true do |t|
>     t.column "username", :string
>     t.column "created_on", :datetime
>     t.column "email", :string
>     t.column "note", :text
>   end
>
> And everything works fine, but in development, it has to run this 
> query for each view
>
> select column_name, data_type, data_default, nullable,  
> decode(data_type, ''NUMBER'', data_precision, 
''VARCHAR2'', data_length,
>  null) as length,
>  decode(data_type, ''NUMBER'', data_scale, null) as scale
>  from user_catalog cat, user_synonyms syn, all_tab_columns col
>  where cat.table_name = ''USERS''
>  and syn.synonym_name (+)= cat.table_name
>  and col.table_name = nvl(syn.table_name, cat.table_name)
>  and col.owner = nvl(syn.table_owner, user)
>
> I am assuming that this is because development mode can''t cache
the
> models... in production mode it seems to take about 8 seconds the
first > time but then it''s really fast.
>
> To test, I''ve placed this into SQLPlus and it takes about 6
seconds to
> execute there as well.
>
> Is this something that others are experiencing? I''m seeing 6-7
seconds
> delay between requests because of this query running on all of my view
> pages. Is there something that can be done or is the price of doing 
> business with Oracle? :)
>
The default query is very, very slow, partly because it has to account
for all the different possible ways you might have configured your
tables. In my case, I just make a user synonym on the user Rails is
logging in as, in development. Then, in my development environment.rb,
include something like this, which overrides the query.

module ActiveRecord
  module ConnectionAdapters
    class OCIAdapter < AbstractAdapter
      def columns(table_name, name = nil)
          table_cols = <<-SQL_CODE
            select column_name, data_type, data_default, nullable,
              decode(data_type, ''NUMBER'', data_precision,
''VARCHAR2'',
              data_length, null) as length,
              decode(data_type, ''NUMBER'', data_scale, null) as
scale
             from user_synonyms syn
             join all_tab_columns col on syn.table_name = col.table_name
             where syn.table_name = #{table_name.to_s.upcase}
             and col.owner = nvl(syn.table_owner, user) }
          SQL_CODE

          select_all(table_cols, name).map do |row|
           
row[''data_default''].sub!(/^''(.*)''\s*$/,
''\1'') if
row[''data_default'']
            OCIColumn.new(
              oci_downcase(row[''column_name'']),
              row[''data_default''],
              row[''data_type''],
              row[''length''],
              row[''scale''],
              row[''nullable''] == ''Y'')
          end
      end
    end
  end
end

Leon Leslie

2006-Jan-13 21:28 UTC

head link

[Rails] Oracle and Rails seems really slow.... In development

Is this a patch?

On 1/13/06, Hogan, Brian P. <HOGANBP@uwec.edu>
wrote:>
>
> Neat!
>
> >From my findings, though.... This is what I noticed:
>
> The original code:
>
>                   table_cols = %Q{
>                     select column_name, data_type, data_default,
> nullable,
>                            decode(data_type, ''NUMBER'',
data_precision,
>                                              ''VARCHAR2'',
data_length,
>                                               null) as length,
>                            decode(data_type, ''NUMBER'',
data_scale, null)
> as scale
>                       from #{scope}_catalog cat, #{scope}_synonyms syn,
> all_tab_columns col
>                      where cat.table_name = #{table}
>                        and syn.synonym_name (+)= cat.table_name
>                        and col.table_name = nvl(syn.table_name,
> cat.table_name)
>                        and col.owner = nvl(syn.table_owner, #{(scope =>
"all" ? "cat.owner" : "user")}) }
>
>
>
> My version
>
>
>
>                   table_cols = %Q{
>                     select column_name, data_type, data_default,
> nullable,
>                            decode(data_type, ''NUMBER'',
data_precision,
>                                              ''VARCHAR2'',
data_length,
>                                               null) as length,
>                            decode(data_type, ''NUMBER'',
data_scale, null)
> as scale
>                       from #{scope}_catalog cat, #{scope}_synonyms syn,
> all_tab_columns col
>                      where col.table_name = #{table}
>                        and syn.synonym_name (+)= cat.table_name
>                        and col.table_name = nvl(syn.table_name,
> cat.table_name)
>                        and col.owner = nvl(syn.table_owner, #{(scope =>
"all" ? "cat.owner" : "user")}) }
>
>
>
> Runs no problem.
>
> I just changed
>
> where cat.table_name = #{table}
>
> To
> where col.table_name = #{table}
>
>
> Since the ALL_TAB_COLUMNS has the table name, this works great.... And
> this fix makes it just fly!
>
>
> -----Original Message-----
> From: rails-bounces@lists.rubyonrails.org
> [mailto:rails-bounces@lists.rubyonrails.org] On Behalf Of Wilson
> Bilkovich
> Sent: Friday, January 13, 2006 1:49 PM
> To: rails@lists.rubyonrails.org
> Subject: Re: [Rails] Oracle and Rails seems really slow.... In
> development
>
>
> On 1/11/06, Hogan, Brian P. <HOGANBP@uwec.edu> wrote:
> >
> >
> > I''m just looking into how to connect to Oracle using Rails. 
I''ve got
> > everything connecting and working as it should.
> >
> > I have a Users table in Oracle:
> >
> >   create_table "users", :force => true do |t|
> >     t.column "username", :string
> >     t.column "created_on", :datetime
> >     t.column "email", :string
> >     t.column "note", :text
> >   end
> >
> > And everything works fine, but in development, it has to run this
> > query for each view
> >
> > select column_name, data_type, data_default, nullable,
> > decode(data_type, ''NUMBER'', data_precision, 
''VARCHAR2'', data_length,
> >  null) as length,
> >  decode(data_type, ''NUMBER'', data_scale, null) as
scale
> >  from user_catalog cat, user_synonyms syn, all_tab_columns col
> >  where cat.table_name = ''USERS''
> >  and syn.synonym_name (+)= cat.table_name
> >  and col.table_name = nvl(syn.table_name, cat.table_name)
> >  and col.owner = nvl(syn.table_owner, user)
> >
> > I am assuming that this is because development mode can''t
cache the
> > models... in production mode it seems to take about 8 seconds the
> first
> > time but then it''s really fast.
> >
> > To test, I''ve placed this into SQLPlus and it takes about 6
seconds to
>
> > execute there as well.
> >
> > Is this something that others are experiencing? I''m seeing
6-7 seconds
>
> > delay between requests because of this query running on all of my view
>
> > pages. Is there something that can be done or is the price of doing
> > business with Oracle? :)
> >
>
> The default query is very, very slow, partly because it has to account
> for all the different possible ways you might have configured your
> tables. In my case, I just make a user synonym on the user Rails is
> logging in as, in development. Then, in my development environment.rb,
> include something like this, which overrides the query.
>
> module ActiveRecord
>   module ConnectionAdapters
>     class OCIAdapter < AbstractAdapter
>       def columns(table_name, name = nil)
>           table_cols = <<-SQL_CODE
>             select column_name, data_type, data_default, nullable,
>               decode(data_type, ''NUMBER'', data_precision,
''VARCHAR2'',
>               data_length, null) as length,
>               decode(data_type, ''NUMBER'', data_scale,
null) as scale
>              from user_synonyms syn
>              join all_tab_columns col on syn.table_name = col.table_name
>              where syn.table_name = #{table_name.to_s.upcase}
>              and col.owner = nvl(syn.table_owner, user) }
>           SQL_CODE
>
>           select_all(table_cols, name).map do |row|
>            
row[''data_default''].sub!(/^''(.*)''\s*$/,
''\1'') if
> row[''data_default'']
>             OCIColumn.new(
>               oci_downcase(row[''column_name'']),
>               row[''data_default''],
>               row[''data_type''],
>               row[''length''],
>               row[''scale''],
>               row[''nullable''] == ''Y'')
>           end
>       end
>     end
>   end
> end
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>


--
First they laugh at you, then they ignore you, then they fight you.
Then you win.
-- Mahatma Karamchand Gandhi
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Hogan, Brian P.

2006-Jan-13 21:49 UTC

head link

[Rails] Oracle and Rails seems really slow.... In development

No patch yet because I just don''t have the time to make patches (never
learned how to do the diff stuff) but I did contact the current
maintainer and did hear back from him a couple of days ago so we''ll see
what happens next.  Right now I just made a plugin to patch it for my
apps.
 
I''ll gladly post the plugin as a zip on my server if anyone cares. 
 
 
-----Original Message-----
From: rails-bounces@lists.rubyonrails.org
[mailto:rails-bounces@lists.rubyonrails.org] On Behalf Of Leon Leslie
Sent: Friday, January 13, 2006 3:28 PM
To: rails@lists.rubyonrails.org
Subject: Re: [Rails] Oracle and Rails seems really slow.... In
development


Is this a patch?


On 1/13/06, Hogan, Brian P. <HOGANBP@uwec.edu> wrote: 


	Neat!
	
	>From my findings, though.... This is what I noticed:
	
	The original code:
	
	                  table_cols = %Q{
	                    select column_name, data_type, data_default,
	nullable,
	                           decode(data_type, ''NUMBER'',
data_precision,
	                                             ''VARCHAR2'',
data_length,
	                                              null) as length,
	                           decode(data_type, ''NUMBER'',
data_scale, null)
	as scale
	                      from #{scope}_catalog cat,
#{scope}_synonyms syn,
	all_tab_columns col
	                     where cat.table_name = #{table}
	                       and syn.synonym_name (+)= cat.table_name
	                       and col.table_name = nvl(syn.table_name,
	cat.table_name)
	                       and col.owner = nvl(syn.table_owner,
#{(scope =	"all" ? "cat.owner" : "user")}) }
	
	
	
	My version
	
	
	
	                  table_cols = %Q{
	                    select column_name, data_type, data_default,
	nullable,
	                           decode(data_type, ''NUMBER'',
data_precision,
	                                             ''VARCHAR2'',
data_length,
	                                              null) as length,
	                           decode(data_type, ''NUMBER'',
data_scale, null)
	as scale
	                      from #{scope}_catalog cat,
#{scope}_synonyms syn,
	all_tab_columns col
	                     where col.table_name = #{table}
	                       and syn.synonym_name (+)= cat.table_name
	                       and col.table_name = nvl(syn.table_name,
	cat.table_name)
	                       and col.owner = nvl(syn.table_owner,
#{(scope =	"all" ? "cat.owner" : "user")}) }
	
	
	
	Runs no problem.
	
	I just changed
	
	where cat.table_name = #{table}
	
	To
	where col.table_name = #{table}
	
	
	Since the ALL_TAB_COLUMNS has the table name, this works
great.... And
	this fix makes it just fly!
	
	
	-----Original Message-----
	From: rails-bounces@lists.rubyonrails.org
	[mailto:rails-bounces@lists.rubyonrails.org] On Behalf Of Wilson
	Bilkovich
	Sent: Friday, January 13, 2006 1:49 PM
	To: rails@lists.rubyonrails.org
	Subject: Re: [Rails] Oracle and Rails seems really slow.... In
	development
	
	
	On 1/11/06, Hogan, Brian P. < HOGANBP@uwec.edu
<mailto:HOGANBP@uwec.edu> > wrote:
	>
	>
	> I''m just looking into how to connect to Oracle using Rails.
I''ve got
	> everything connecting and working as it should.
	>
	> I have a Users table in Oracle: 
	>
	>   create_table "users", :force => true do |t|
	>     t.column "username", :string
	>     t.column "created_on", :datetime
	>     t.column "email", :string 
	>     t.column "note", :text
	>   end
	>
	> And everything works fine, but in development, it has to run
this
	> query for each view
	>
	> select column_name, data_type, data_default, nullable, 
	> decode(data_type, ''NUMBER'', data_precision, 
''VARCHAR2'',
data_length,
	>  null) as length,
	>  decode(data_type, ''NUMBER'', data_scale, null) as scale
	>  from user_catalog cat, user_synonyms syn, all_tab_columns col

	>  where cat.table_name = ''USERS''
	>  and syn.synonym_name (+)= cat.table_name
	>  and col.table_name = nvl(syn.table_name, cat.table_name)
	>  and col.owner = nvl(syn.table_owner, user)
	>
	> I am assuming that this is because development mode can''t
cache the 
	> models... in production mode it seems to take about 8 seconds
the
	first
	> time but then it''s really fast.
	>
	> To test, I''ve placed this into SQLPlus and it takes about 6
seconds to
	
	> execute there as well. 
	>
	> Is this something that others are experiencing? I''m seeing 6-7
seconds
	
	> delay between requests because of this query running on all of
my view
	
	> pages. Is there something that can be done or is the price of
doing 
	> business with Oracle? :)
	>
	
	The default query is very, very slow, partly because it has to
account
	for all the different possible ways you might have configured
your
	tables. In my case, I just make a user synonym on the user Rails
is 
	logging in as, in development. Then, in my development
environment.rb,
	include something like this, which overrides the query.
	
	module ActiveRecord
	  module ConnectionAdapters
	    class OCIAdapter < AbstractAdapter 
	      def columns(table_name, name = nil)
	          table_cols = <<-SQL_CODE
	            select column_name, data_type, data_default,
nullable,
	              decode(data_type, ''NUMBER'', data_precision,
''VARCHAR2'',
	              data_length, null) as length,
	              decode(data_type, ''NUMBER'', data_scale, null)
as
scale
	             from user_synonyms syn
	             join all_tab_columns col on syn.table_name col.table_name
	             where syn.table_name = #{table_name.to_s.upcase}
	             and col.owner = nvl(syn.table_owner, user) }
	          SQL_CODE
	
	          select_all(table_cols, name).map do |row| 
	           
row[''data_default''].sub!(/^''(.*)''\s*$/,
''\1'') if
	row[''data_default'']
	            OCIColumn.new(
	              oci_downcase(row[''column_name'']),
	              row[''data_default''],
	              row[''data_type''], 
	              row[''length''],
	              row[''scale''],
	              row[''nullable''] == ''Y'')
	          end
	      end
	    end
	  end
	end
	_______________________________________________
	Rails mailing list 
	Rails@lists.rubyonrails.org
	http://lists.rubyonrails.org/mailman/listinfo/rails
	




-- 
First they laugh at you, then they ignore you, then they fight you.
Then you win.
-- Mahatma Karamchand Gandhi 
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Lori Olson

2006-Jan-14 00:22 UTC

head link

[Rails] Oracle and Rails seems really slow.... In development

On Jan 13, 2006, at 2:49 PM, Hogan, Brian P. wrote:
> No patch yet because I just don''t have the time to make patches  
> (never learned how to do the diff stuff) but I did contact the  
> current maintainer and did hear back from him a couple of days ago  
> so we''ll see what happens next.  Right now I just made a plugin to
> patch it for my apps.
>
> I''ll gladly post the plugin as a zip on my server if anyone cares.
>
>
We care!  We care!

Russ McBride

2006-Jan-14 01:39 UTC

head link

[Rails] how to upload a raw image in rails?

Hi,

I''m uploading a raw image into a blob column and noticed that unless 
I overwrote the model attribute writer that Rails would try to load a 
ruby object for the image instead of just the raw data.  So in the 
model I did this:

     def picture=(picture_field)
         write_attribute(:picture, picture_field.read)   
     end

and things work fine (though I don''t really know what I''m
doing) ...
except if the user fails to select an image to upload, in which cases 
I get an error:

    undefined method "read" for string ""

Any ideas for avoiding this error message in these cases?  It seems 
like some kind of conditional wrapped around the write_attribute 
command should work, probably some IO method that will test for the 
ability to read a stream (am I working with a stream here?) ...  or 
maybe there''s a better way to upload a raw image.

Thanks,
russ
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Adam Denenberg

2006-Jan-14 04:33 UTC

head link

[Rails] how to upload a raw image in rails?

put the images on the filesystem and use file_column.  Tons of threads
on it in here (a few by me thats for sure).

http://www.kanthak.net/opensource/file_column/

On 1/13/06, Russ McBride <Russ@psyex.com> wrote:>
>
>
> Hi,
>
>
> I''m uploading a raw image into a blob column and noticed that
unless I
> overwrote the model attribute writer that Rails would try to load a ruby
> object for the image instead of just the raw data.  So in the model I did
> this:
>
>
>     def picture=(picture_field)
>          write_attribute(:picture, picture_field.read)
>      end
>
>
> and things work fine (though I don''t really know what I''m
doing) ... except
> if the user fails to select an image to upload, in which cases I get an
> error:
>
>
>    undefined method "read" for string ""
>
>
> Any ideas for avoiding this error message in these cases?  It seems like
> some kind of conditional wrapped around the write_attribute command should
> work, probably some IO method that will test for the ability to read a
> stream (am I working with a stream here?) ...  or maybe there''s a
better way
> to upload a raw image.
>
>
> Thanks,
> russ
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>
>
>

Michael Schoen

2006-Jan-23 06:06 UTC

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[Rails] Oracle and Rails seems really slow.... In development

Hogan, Brian P. wrote:> No patch yet because I just don''t have the time to make patches
(never
> learned how to do the diff stuff) but I did contact the current 
> maintainer and did hear back from him a couple of days ago so
we''ll see
> what happens next.  Right now I just made a plugin to patch it for my apps.
It''s on my list, should be able to get a patch submitted for this by
the
end of the week. Note that I''m still concerned about the revised query.
But I''ve been sent a few different options, and one of them will work
out.

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