関連ワード:  what is data dictionary in database    what is data dictionary in database management system    what is data dictionary in oracle database    what is the data dictionary's function in database design    what is data dictionary in the context of databases    what is the purpose of a data dictionary in database design    what is the purpose of a data dictionary in database management    what is the primary purpose of a data dictionary in database management    what is the purpose of data dictionary in a database    what is the use of data dictionary in a database system