[单选]

You are connected to a pluggable database (PDB) as a common user with DBA privileges.
The STATISTICS_LEVEL parameter is PDB_MODIFIABLE. You execute the following:
SQL > ALTER SYSTEM SET STATISTICS_LEVEL = ALL SID = ‘*’ SCOPE = SPFILE;
Which is true about the result of this command?（）

You are using the following command to clear the log file group： ALTER DATABASE CLEAR LOFFILE GROUP 2； In which case would the command be successful？（） Group 2 is the active group.。 Group 2 is the current group.。 Database is in the MOUNT state.。 Group 2 has been already archived.。 防护树类 When is an implicit anchor created?（） When an object is enclosed by another object. 。 When a page break after pagination property is enabled. 。 When a link is created between two objects. 。 When a keep with anchoring object pagination property is enabled.。 You have an Automatic Storage Management （ASM） instance managing the database files of your production database. The database contains ASM files and non-ASM files. Using Recovery Manager （RMAN）， you migrate the complete production database to use the ASM instance. Which statement is true？ （）  RMAN would relocate all the data files to an ASM disk group and other files to an operating system location， defined using Oracle Managed Files （OMF）.。  RMAN would relocate the ASM files to an ASM disk group and the non-ASM files to an operating system location， defined using OMF。  RMAN would relocate all the database files to an ASM disk group.。  RMAN would change the file definitions in the control file to use the ASM but would not relocate the database files physically.。 采用市场法评估资产价值时，可以作为参照物的资产应该是与被评资产相同或者类似的资产。

You are connected to a pluggable database (PDB) as a common user with DBA privileges.
The STATISTICS_LEVEL parameter is PDB_MODIFIABLE. You execute the following:
SQL > ALTER SYSTEM SET STATISTICS_LEVEL = ALL SID = ‘*’ SCOPE = SPFILE;
Which is true about the result of this command?（）