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Diffstat (limited to 'doc/development/foreign_keys.md')
| -rw-r--r-- | doc/development/foreign_keys.md | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/doc/development/foreign_keys.md b/doc/development/foreign_keys.md index db8367fe5f5..c20c70623ae 100644 --- a/doc/development/foreign_keys.md +++ b/doc/development/foreign_keys.md @@ -123,3 +123,7 @@ class UserConfig < ActiveRecord::Base belongs_to :user end ``` + +Using a foreign key as primary key saves space but can make +[batch counting](service_ping/implement.md#batch-counters) in [Service Ping](service_ping/index.md) less efficient. +Consider using a regular `id` column if the table will be relevant for Service Ping. |