It is important to note that the Personal geodatabase format is not supported in ArcGIS Pro. Esri has been slowly reducing support for this type of geodatabase, which is built on top of Microsoft Access Database technology. This is largely due to the limitations of Microsoft Access, which is restricted to 2 gigabytes in size and whose performance slows down as the database gets larger. This is the reason why Esri developed the file geodatabase.
It is strongly recommended that if you are still using personal geodatabases, you migrate them to a file or enterprise geodatabase, especially if you wish to begin using ArcGIS Pro or ArcGIS Online. File and enterprise geodatabases offer much better performance and storage capacity. The following table is a general comparison between the three general types of geodatabases that can be created with the ArcGIS platform:
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