DDL保护主要用于远距离或电阻型故障的检测，DDL保护分为（）保护。
DDL保护主要用于远距离或电阻型故障的检测，DDL保护分为（）保护。
相关考题：
Examine the following command;ALTER SYSTEM SET enable_ddl_logging = TRUE;Which statement is true?() A. Only the data definition language (DDL) commands that resulted in errors are logged in the alert log file.B. All DDL commands are logged in the alert log file.C. All DDL commands are logged in a different log file that contains DDL statements and their execution dates.D. Only DDL commands that resulted in the creation of new segments are logged.E. All DDL commands are logged in XML format in the alert directory under the Automatic Diagnostic Repository (ADR) home.
关于DDL与事务控制，下列说法错误的是（）。A、COMMIT和ROLLBACK语句只应用于DMLB、无法回滚DDL语句C、DDL语句一旦被执行就会立即具有持久状态D、如果没有在CREATETABLE命令内嵌入COMMIT命令，不会出现未完成的
漏电保护开关，其特点是能够（）后自动切断故障电路，用作人身触电保护和电气设备漏电保护。A、检测与判断到缺相故障B、检测与判断到欠电压故障C、检测与判断到触电或漏电故障D、检测与判断到过电流故障
（）表示事务中只能包含数据处理语句，事务中的数据定义语句将引起事务立即提交。A、SQL_TC_NONEB、SQL_TC_DMLC、SQL_DDL_COMMITD、SQL_DDL_IGNORE
多选题What are three benefits of performing data definition language （DDL） statements against a partitioned table with the UPDATE GLOBAL INDEXES clause？（）AGlobal indexes are rebuilt automatically at the end of the DDL operation thereby avoiding problems with the UNUSABLE status.BYou do not have to search for invalid global indexes after the DDL command completes and rebuild them individually.CGlobal indexes are maintained during the operation of the DDL command and therefore can be used by any concurrent query.DGlobal indexes remain intact and available for use by data manipulation language （DML） statements even for sessions that have not enabled the skipping of unusable indexes.
单选题Examine the following command; ALTER SYSTEM SET enable_ddl_logging = TRUE; Which statement is true?（）AOnly the data definition language (DDL) commands that resulted in errors are logged in the alert log file.BAll DDL commands are logged in the alert log file.CAll DDL commands are logged in a different log file that contains DDL statements and their execution dates.DOnly DDL commands that resulted in the creation of new segments are logged.EAll DDL commands are logged in XML format in the alert directory under the Automatic Diagnostic Repository (ADR) home.
单选题Examine the following command:ALTER SYSTEM SET enable_ddl_logging=FALSE;Which statement is true?（）ANone of the data definition language (DDL) statements are logged in the trace file.BOnly DDL commands that resulted in errors are logged in the alert log file.CA new log.xml file that contains the DDL statements is created, and the DDL command details are removed from the alert log file.DOnly DDL commands that resulted in the creation of new database files are logged.