多选题Which three statements are true about windows？（）AOnly one window can be open at any given timeBConsumer groups are associated with windowsCWindows work with job classes to control resource allocationDThe database service name must be provided during wi

The order of the terms in a policy is irrelevant

The action is specified in a then statement

Ters are optional in a policy

The match condition can be identified with a from statement

Every policy must contain at least one term

Only one window can be open at any given time

Consumer groups are associated with windows

Windows work with job classes to control resource allocation

The database service name must be provided during windows creation

Windows can automatically start job or change resource allocation among jobs for various time periods.

Only one window can be open at any given time

Consumer groups are associated with windows

Windows work with job classes to control resource allocation

The database service name must be provided during windows creation

Windows can automatically start job or change resource allocation among jobs for various time periods.

Only data files and the control file are backed up.

Archived redo logs are backed up only if the database is open during the backup.

The backup is deleted after one day，regardless of the default retention policy settings.

The backup becomes obsolete after one day，regardless of the default retention policy settings.

Only two destinations per remote database can be specified.

Destination is an Oracle Net alias specified by using the SERVICE keyword.

The REOPEN attribute must be used when using remote archive log file destinations.

The service name is resolved by searching sqlnet.ora file for the remote database name.

PPPoE can provide a host with access to a destination over Ethernet. You can have only one  PPPoE session per PVC

You must install PPPoE client software on all hosts that connect to the Ethernet segment. This means that the access provider must maintain a CPE

You cannot use PPPoE with Cisco Service Selection Gateway

PPPoE implementation is susceptible to broadcast storms and possible denial-of-service attacks

Per-session accounting is possible， which allows the service provider to charge the subscriber based on session time for various services offered. The service provider can also require a minimum access charge

A DBA can check specific tables with the DMU

The database to be migrated must be opened read-only.

The release of the database to be converted can be any release since 9.2.0.8.

The DMU can report columns that are too long in the converted characterset.

The DMU can report columns that are not represented in the converted characterset.

Flashback logs are written sequentially, and are archived.

Flashback Database uses a restored control file to recover a database.

The Oracle database automatically creates, deletes, and resides flashback logs in the Fast Recovery Area.

Flashback Database can recover a database to the state that it was in before a reset logs operation.

Flashback Database can recover a data file that was dropped during the span of time of the flashback.

Flashback logs are used to restore to the blocks' before images, and then the redo data may be used to roll forward to the desired flashback time.

Every  tag must have at least one  tag.

A  tag can have many  tags.

A given  tag can apply to only one  tag.

A given  tag can contain from zero to many  tags.

It is possible to construct a valid  tag such that，for a given resource，no user rolescan access that resource.

Member variables of the outer instance are always accessible to inner instances， regardless of their      accessibility modifiers.

Member variables of the outer instance can never be referred to using only the variable name within     the inner instance.

More than one inner instance can be associated with the same outer instance.

All variables from the outer instance that should be accessible in the inner instance must be declared     final.

A class that is declared final cannot have any inner classes.

The PDB must be open in read only mode.

The PDB must be dosed.

The unplugged PDB becomes a non-cdb.

The unplugged PDB can be plugged into the same multitenant container database (CDB)

The unplugged PDB can be plugged into another cdb.

The PDB data files are automatically removed from disk.

A DBA can enable or disable an individual task in all maintenance windows.

A DBA cannot change the duration of the maintenance window after it is created.

In case of a long maintenance window，all Automated Maintenance Tasks are restarted every four hours.

A DBA can control the percentage of the resource allocated to the Automated Maintenance Tasks in each window

A different login class must be configured for each user.

Individual commands can be explicitly allowed or denied.

A user must be assigned to one of the default login classes.

Each login class is associated with one or more permissions flags.

SLA sender target can be an IP host

SLA sender sends a probe packet and a response probe packet

SLA sender sends a probe packet

SLA sender target must be a router

SLA sender target can be an IP SLA responder

You must install PPPoP client software on all hosts that connects to the Ethernet segment this means that the access provider must maintain a CPE

PPPoP can provide a host with access to a destination over Ethernet. You can have only one PPPoPsession per PVC

PPPoP implementation is susceptible to broadcast storms and possible denial-of-service attacks

You cannot use PPPoP with Cisco Service Selection Gateway

Per-session accounting is possible， which allows the service provider to charge the subscribe based onsession time for various services offered. The service provider can also require a minimum access change