10005: Layer's data source is a personal geodatabase

You are using a personal geodatabase, which can perform poorly in many situations. This warning message might also appear as Layer has a personal geodatabase join.


More information

Generally speaking, ESRI recommends migrating your geodatabases to file geodatabases and ArcSDE geodatabases to not only improve performance but also to scale your geodatabases to larger sizes.

For best performance with geodatabases, use either ArcSDE geodatabases and file geodatabases. In some cases where there are many simultaneous users, ArcSDE geodatabases are faster. Since ArcSDE geodatabases are DBMS based, they will scale better than file geodatabases in situations where you have a large number of users (for example, hundreds of users or more).

See Types of geodatabases for more information.