November 2015
Intermediate to advanced
200 pages
4h 26m
English
Content preview from Ruby Performance Optimization
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Make ActiveRecord Faster
ActiveRecord is a wrapper around your data. By definition that should take memory, and oh indeed it does. It turns out the overhead is quite significant, in both the number of objects and in raw memory.
To see the overhead, let’s create a database table with 10 string columns and fill it with 10,000 rows, each row containing 10 strings of 100 chars.
| chp3/app/db/migrate/20140722140429_large_tables.rb | |
| | class LargeTables < ActiveRecord::Migration |
| | def up |
| | create_table :things do |t| |
| | 10.times do |i| |
| | t.string "col#{i}" |
| | end |
| | end |
| | |
| | execute <<-END |
| | insert into things(col0, col1, col2, col3, col4, |
| | col5, col6, col7, col8, col9) ( |
| | select |
| | rpad('x', 100, 'x'), rpad('x', 100, 'x'), rpad('x', ... |
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.