# Known limitations for the PostgreSQL connector
Known limitations
+ Deleted database rows will not be tracked in when Amazon Q checks for updated content.
+ The size of field names and values in a row of your database can't exceed 400KB.
+ Column names should only contain alphanumeric characters and not spaces.
+ If you have a large amount of data in your database data source, and do not want Amazon Q to index all your database content after the first sync, you can choose to sync only new, modified, or deleted documents.