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Diffstat (limited to 'doc/development/verifying_database_capabilities.md')
| -rw-r--r-- | doc/development/verifying_database_capabilities.md | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/doc/development/verifying_database_capabilities.md b/doc/development/verifying_database_capabilities.md index cc6d62957e3..ffdeff47d4a 100644 --- a/doc/development/verifying_database_capabilities.md +++ b/doc/development/verifying_database_capabilities.md @@ -24,3 +24,15 @@ else run_query end ``` + +# Read-only database + +The database can be used in read-only mode. In this case we have to +make sure all GET requests don't attempt any write operations to the +database. If one of those requests wants to write to the database, it needs +to be wrapped in a `Gitlab::Database.read_only?` or `Gitlab::Database.read_write?` +guard, to make sure it doesn't for read-only databases. + +We have a Rails Middleware that filters any potentially writing +operations (the CUD operations of CRUD) and prevent the user from trying +to update the database and getting a 500 error (see `Gitlab::Middleware::ReadOnly`). |