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Diffstat (limited to 'doc/development/sha1_as_binary.md')
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1 files changed, 7 insertions, 38 deletions
diff --git a/doc/development/sha1_as_binary.md b/doc/development/sha1_as_binary.md index a7bb3001ddb..7f928d09470 100644 --- a/doc/development/sha1_as_binary.md +++ b/doc/development/sha1_as_binary.md @@ -1,42 +1,11 @@ --- -stage: none -group: unassigned -info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments +redirect_to: 'database/sha1_as_binary.md' +remove_date: '2022-11-06' --- -# Storing SHA1 Hashes As Binary +This document was moved to [another location](database/sha1_as_binary.md). -Storing SHA1 hashes as strings is not very space efficient. A SHA1 as a string -requires at least 40 bytes, an additional byte to store the encoding, and -perhaps more space depending on the internals of PostgreSQL. - -On the other hand, if one were to store a SHA1 as binary one would only need 20 -bytes for the actual SHA1, and 1 or 4 bytes of additional space (again depending -on database internals). This means that in the best case scenario we can reduce -the space usage by 50%. - -To make this easier to work with you can include the concern `ShaAttribute` into -a model and define a SHA attribute using the `sha_attribute` class method. For -example: - -```ruby -class Commit < ActiveRecord::Base - include ShaAttribute - - sha_attribute :sha -end -``` - -This allows you to use the value of the `sha` attribute as if it were a string, -while storing it as binary. This means that you can do something like this, -without having to worry about converting data to the right binary format: - -```ruby -commit = Commit.find_by(sha: '88c60307bd1f215095834f09a1a5cb18701ac8ad') -commit.sha = '971604de4cfa324d91c41650fabc129420c8d1cc' -commit.save -``` - -There is however one requirement: the column used to store the SHA has _must_ be -a binary type. For Rails this means you need to use the `:binary` type instead -of `:text` or `:string`. +<!-- This redirect file can be deleted after <2022-11-06>. --> +<!-- Redirects that point to other docs in the same project expire in three months. --> +<!-- Redirects that point to docs in a different project or site (for example, link is not relative and starts with `https:`) expire in one year. --> +<!-- Before deletion, see: https://docs.gitlab.com/ee/development/documentation/redirects.html --> |