OCP-1Z0-053-V13.02-445题

445.To set the history retention period for either window logging or job logging individually, which

parameters of the SET_SCHEDULER_ATTRIBUTE procedure need to be used? (Choose all that apply.)

A. LOG_HISTORY

B. JOB_LOG_RETENTION

C. WINDOW_LOG_RETENTION

D. WHICH_LOG

E. LOG_NAME

Answer: AD

SET_SCHEDULER_ATTRIBUTE Procedure

This procedure sets the value of a Scheduler attribute. This takes effect immediately but the resulting changes may not be seen immediately.

Table 129-97 provides short attribute descriptions for the SET_SCHEDULER_ATTRIBUTE procedure. For complete descriptions, see section "Setting Scheduler Preferences" in Oracle Database Administrator's Guide.

Syntax

DBMS_SCHEDULER.SET_SCHEDULER_ATTRIBUTE (

   attribute      IN VARCHAR2,

   value          IN VARCHAR2);

Parameters

Table 129-97 SET_SCHEDULER_ATTRIBUTE Procedure Parameters

ParameterDescription

attribute

The name of the Scheduler attribute. Possible values are:

• 'default_timezone': Repeating jobs and windows that use the calendaring syntax retrieve the time zone from this attribute when start_date is not specified. See "Calendaring Syntax" for more information.

• 'email_server': The SMTP server address that the Scheduler uses to send e-mail notifications for job state events. E-mail notifications cannot be sent if this attribute is NULL.

• 'email_sender': The default e-mail address of the sender of job state e-mail notifications.

• 'email_server_credential': The schema and name of an existing credential object that SYS has execute object privileges on. Default is NULL. The username and password stored in this credential are used to authenticate with the e-mail server when sending e-mail notifications.

  This functionality is available with Oracle Database 11g Release 2 (11.2.0.2).

• 'email_server_encryption': This attribute indicates whether or not encryption is enabled for this email server connection, and if so, at what point encryption starts, and with which protocol. Values are:

  • NONE: the default, indicating no encryption used

  • SSL_TLS: indicating that either SSL or TLS are used, from the beginning of the connection

  • STARTTLS:indicating that the connection starts unencrypted, but the command STARTTLS is sent to the e-mail server and starts encryption

  This functionality is available starting with Oracle Database 11g Release 2 (11.2.0.2).

• 'event_expiry_time': The time, in seconds, before a job state event generated by the Scheduler expires from the Scheduler event queue. If NULL, job state events expire after 24 hours.

• 'log_history': The number of days that log entries for both the job log and the window log are retained. Default is 30 and the range of valid values is 0 through 1000000.

• 'max_job_slave_processes': This Scheduler attribute is not used.

value

The new value of the attribute

Usage Notes

To run SET_SCHEDULER_ATTRIBUTE, you must have the MANAGE SCHEDULER privilege.

 

PURGE_LOG Procedure

By default, the Scheduler automatically purges all rows in the job log and window log that are older than 30 days. The PURGE_LOG procedure is used to purge additional rows from the job and window log.

Rows in the job log table pertaining to the steps of a chain are purged only when the entry for the main chain job is purged (either manually or automatically).

Syntax

DBMS_SCHEDULER.PURGE_LOG (

   log_history             IN PLS_INTEGER  DEFAULT 0,

   which_log               IN VARCHAR2     DEFAULT 'JOB_AND_WINDOW_LOG',

   job_name                IN VARCHAR2     DEFAULT NULL);

Parameters

Table 129-69 PURGE_LOG Procedure Parameters

ParameterDescription

log_history

This specifies how much history (in days) to keep. The valid range is 0 - 1000000. If set to 0, no history is kept.

which_log

This specifies the log type. Valid values are: job_log, window_log, and job_and_window_log.

job_name

This specifies which job-specific entries must be purged from the jog log. This can be a comma-delimited list of job names and job classes. Whenever job_name has a value other than NULL, the which_log argument implicitly includes the job log.

Usage Notes

This procedure requires the MANAGE SCHEDULER privilege.

Examples

The following completely purges all rows from both the job log and the window log:

DBMS_SCHEDULER.PURGE_LOG();

The following purges all rows from the window log that are older than 5 days:

DBMS_SCHEDULER.PURGE_LOG(5, 'window_log');

The following purges all rows from the window log that are older than 1 day and all rows from the job log that are related to jobs in jobclass1 and older than 1 day:

DBMS_SCHEDULER.PURGE_LOG(1, 'job_and_window_log', 'sys.jobclass1');

来源： <http://docs.oracle.com/cd/E11882_01/appdev.112/e40758/d_sched.htm#ARPLS72383>