Mysql2::VERSION => "0.4.10" On Thursday, March 15, 2018 at 9:19:18 AM UTC+2, matas.si...@ksdigital.lt wrote: > > Hi, I understand that. But paged_each is selecting whole table instead in > batches. Maybe it's because I connect additional servers? Im fetching > additional server`s database. > > On Wednesday, March 14, 2018 at 4:49:10 PM UTC+2, Jeremy Evans wrote: >> >> On Wednesday, March 14, 2018 at 2:42:09 AM UTC-7, >> matas.si...@ksdigital.lt wrote: >>> >>> Hi, >>> >>> I have some troubles with Sequel`s paged_each. I'm using mysql2 >>> I have simple model: >>> >>> class Attribute < Sequel::Model >>> one_to_many :attribute_values >>> end >>> >>> >>> I'm connecting to slave database: >>> ... >>> DB = Sequel.connect(config, servers: servers) >>> ... >>> >>> rails console: >>> >>> irb(main):009:0> Attribute.methods >>> [... :paged_each, ...] >>> >>> irb(main):008:0> Attribute.paged_each >>> (0.001443s) SELECT * FROM `attributes` ORDER BY `id` >>> >> >> In the mysql2 adapter, if the mysql2 driver supports streaming, >> paged_each uses streaming as an optimization by default. If you really >> don't want to use streaming for some reason, you can pass the >> :stream=>false option, but in general there isn't a good reason to do that. >> >> The purpose of paged_each is to iterate over large result sets without >> keeping all rows in memory. The default implementation of paged_each uses >> LIMIT/OFFSET since that should work on all databases. paged_each can be >> made to use ORDER BY and WHERE, which should also work on all databases. >> However, if streaming results is supported, that's usually the fastest >> approach and the default where it is supported. >> >> Thanks, >> Jeremy >> >
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