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These programs, known as "application programs", are written in a host language and have embedded Data Modification Language(DML) calls to interact with DBMS. 这些被称为“应用程序”的程序，是用主机语言编写的，并嵌入了用以与数据库管理系统进行交互的数据修改语言调用。
Schema modification (Sch-M) locks are used when a table data definition language (DDL) operation (such as adding a column or dropping a table) is being performed. 锁在数据库对象，比如表，结构改变时被使用。