[单选] You are maintaining the PROD database of NetFx Corporation. You set the value of the SQL_TRACE parameter to TRUE. What will be the impact of this setting？（）

A . The SQL trace facility will generate the performance statistics for all the SQL statements for an instance and write them in the USER_DUMP_DEST directory.
B . The SQL trace facility will generate the performance statistics for all the SQL statements for a session and write them in the USER_DUMP_DEST directory.
C . The SQL trace facility will generate the performance statistics for all the SQL statements for an instance and write them in the BACKGROUND_DUMP_DEST directory.
D . The SQL trace facility will generate the performance statistics for all the SQL statements for a session and write them in the BACKGROUND_DUMP_DEST directory.

绿地绿篱造型管理标准： You work as a database administrator for Supportcenter.cn. Your database is configured for automatic undo management. UNDO_RETENTION is set to 3 hours. You want to flash back a table that was created last year. How far back can the flashback query go？（） 3 hours。 6 months。 until last year。 until last commit。 until the point when the undotablespacewas refreshed。 until the database is shut down and the memory erased。简述吗啡治疗心源性哮喘的作用机制。三角形接线时的线电流是星形接线时线电流的（）倍。 In a database with the database character set of US7ASCII and a national character set of UTF-8, which datatypes would be capable of storing Unicode data by default?（） VARCHAR2。 CHAR。 NVARCHAR2。 CLOB。 LONG。 You are maintaining the PROD database of NetFx Corporation. You set the value of the SQL_TRACE parameter to TRUE. What will be the impact of this setting？（）

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[单选] You are maintaining the PROD database of NetFx Corporation. You set the value of the SQL_TRACE parameter to TRUE. What will be the impact of this setting？（）

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