8 Database Properties

8.1.1 InconsistentLogXptProps (Inconsistent Log Transport Properties)

The InconsistentLogXptProps property returns a table that shows all properties related to log transport services whose values are inconsistent between the broker configuration file and the runtime value in the database.

The properties reported in this table can be either database-specific properties or instance-specific properties. A database-specific property only ensures that there is one value in the broker's configuration file for all instances sharing the database, but the runtime values among the instances can be different. This means that a database-specific property may be inconsistent only on some instances.

This property pertains to the primary database. The table contains the following columns:

• INSTANCE_NAME

  The value matching the SID for the instance.

• STANDBY_NAME

  The database unique name (DB_UNIQUE_NAME) of the standby database to which this log transport services property pertains.

• PROPERTY_NAME

  The name of the log transport services property with an inconsistent value.

• MEMORY_VALUE

  The runtime value being used in the database.

• BROKER_VALUE

  The value of the log transport services property saved in the broker configuration file.

8.1.2 InconsistentProperties (Inconsistent Database Properties)

The InconsistentProperties property returns a table that shows all database properties whose values contained in the broker configuration file are inconsistent with the values in the corresponding server parameter file or the runtime values in the database.

The properties reported in this table can be either database-specific properties or instance-specific properties. A database-specific property only ensures that there is one value in the broker's configuration file for all instances sharing the database, but the runtime memory values or SPFILE values among the instances can be different. This means that a database-specific property may be inconsistent only on some instances.

Each individual database has this property. The table contains the following columns:

• INSTANCE_NAME

  The value matching the SID for the instance.

• PROPERTY_NAME

  The name of the database property with the inconsistent value.

• MEMORY_VALUE

  The corresponding runtime value being used in the database.

• SPFILE_VALUE

  The corresponding value saved in the server parameter file (SPFILE).

• BROKER_VALUE

  The value of the database property saved in the broker configuration file.

8.1.3 LatestLog

Specifies the last 20 lines in the Data Guard broker log file of the specified instance. The LatestLog property is an instance level monitorable property. The table name is the full path of the Data Guard broker log file on the host on which the instance is running. Each instance in the configuration has this property. The table contains the following columns in the order shown:

• Line No.

  The line number of the log in the Data Guard broker log file.

• Timestamp

  The time when the log is generated.

• LogText

  The detailed text of the log.

For example, the following example shows output from a SHOW INSTANCE command:

DGMGRL> SHOW INSTANCE sales1 'LatestLog' /home/oracle10g/log/drcsales1.log
  Line No.            Timestamp             Log Text
       431  2003-06-09-15:51:28 DMON: Entered rfm_release_chief_lock for CTL_GET_STATUS
       432  2003-06-09-15:51:28 DMON: Releasing lock
       433  2003-06-09-15:52:18 DMON: ENUM_DRC: success. (len = 610)
       434  2003-06-09-15:52:18 DMON: ENUM_DRC operation completed
       435  2003-06-09-15:52:27 DMON: Entered rfm_get_chief_lock() for CTL_GET_STATUS, reason 0
       436  2003-06-09-15:52:27 DMON: acquiring lock 105 in 5 mode
       437  2003-06-09-15:52:27 DMON: chief lock convert for healthcheck
       438  2003-06-09-15:52:27 DMON: status from rfi_post_instances() = ORA-00000
       439  2003-06-09-15:52:27 INSV: message for req_id 1.1.496252113, opcode CTL_GET_STATUS, phase 1, flags 5
       440  2003-06-09-15:52:27 DMON: Entered rfmhcexinst
       441  2003-06-09-15:52:27 DMON: rfmhcexinst calling RSMs
       442  2003-06-09-15:52:28 DMON: Setting db status after H/C aggregation
       443  2003-06-09-15:52:28 INSV: message for req_id 1.1.496252113, opcode CTL_GET_STATUS, phase 5, flags 5
       444  2003-06-09-15:52:28 DMON: Setting db status after H/C aggregation
       445  2003-06-09-15:52:28 INSV: message for req_id 1.1.496252113, opcode CTL_GET_STATUS, phase 3, flags 65541
       446  2003-06-09-15:52:28 DMON: Entered rfm_release_chief_lock for CTL_GET_STATUS
       447  2003-06-09-15:52:28 DMON: Releasing lock
       448  2003-06-09-15:52:43 DMON: ENUM_DRC: success. (len = 610)
       449  2003-06-09-15:52:43 DMON: ENUM_DRC operation completed
       450  2003-06-09-15:52:43 RSM 0 received GETPROP request: rid=0x01010001, pid=11

This property supplants the obsolete SHOW LOG command in Oracle 9iR2.

8.1.4 LogXptStatus (Log Transport Status)

The LogXptStatus property returns a table that contains the error status of log transport services for each of the enabled standby databases. This property pertains to the primary database.

The table contains the following columns:

• PRIMARY_INSTANCE_NAME

  The value matching the SID for the instance on the primary database.

• STANDBY_DATABASE_NAME

  The database unique name (DB_UNIQUE_NAME) of the standby database.

• ERROR

  The text of the log transport error. If there is no error, the field is empty.

Each entry in the table indicates the status of log transport services on one primary instance to one standby database.

The format of the error status is as follows:

"standby1_sitename=error_status, standby2_sitename=error_status,..."

The error status can be an empty string, which indicates there is no error.

In the following example, the STATUS from DR_Sales is empty because there is no error for the DR_Sales destination. The South_Report destination returned the ORA-01034 message.

DGMGRL> SHOW DATABASE 'North_Sales' 'LogXptStatus' ;
LOG TRANSPORT STATUS
PRIMARY_INSTANCE_NAME STANDBY_DATABASE_NAME               STATUS
             sales1            DR_Sales
             sales1        South_Report      ORA-01034: ORACLE not available

8.1.5 LsbyFailedTxnInfo (Logical Standby Failed Transaction Information)

The LsbyFailedTxnInfo property identifies a failed transaction that caused log apply services to stop. This property contains a string with the following values from the DBA_LOGSTDBY_EVENTS view:

• XIDUSN: Transaction ID undo segment number

• XIDSLT: Transaction ID slot number

• XIDSQN: Transaction ID sequence number

• STATUS_CODE: Status (or Oracle error code) belonging to the STATUS message

• STATUS: Description of the current activity of the process or the reason why log apply services stopped

The transaction IDs and status information are separated by a string of number signs (###). This property pertains to a logical standby database.

8.1.6 LsbyParameters (Logical Standby Parameters)

The LsbyParameters property contains a string that identifies the value of MAX_SGA (maximum system global area) and MAX_SERVERS (maximum number of parallel query servers) specifically reserved for log apply services. These values are separated by a string of number signs (###) in the LsbyParameters property.

This property pertains to a logical standby database.

8.1.7 LsbySkipTable (Logical Standby Skip Table)

The LsbySkipTable property lists the logical apply skip specifications. These skip specifications specify filters for log apply services to skip applying a certain class of online redo log files on the logical standby database. This property returns a table with the following columns from the DBA_LOGSTDBY_SKIP view:

• ERROR

  Indicates if the statement should be skipped (Y) or if errors should be returned for the statement (N)

• STATEMENT_OPT

  Indicates the type of statement that should be skipped

• SCHEMA

  The schema name for which this skip option should be used

• NAME

  Name of the object for which this skip option should be used

• PROCEDURE

  Name of the stored procedure to execute when processing the skip option

8.1.8 LsbySkipTxnTable (Logical Standby Skip Transaction Table)

The LsbySkipTxnTable lists the skip settings chosen. This property returns a table with following columns:

• XIDUSN: Transaction ID undo segment number

• XIDSLT: Transaction ID slot number

• XIDSQN: Transaction ID sequence number

• ACTIVE: Description of the current activity of the process or the reason why log apply services stopped

This property pertains to a logical standby database.

8.1.9 RecvQEntries (Receive Queue Entries)

The RecvQEntries property returns a table indicating all log files that were received by the standby database but have not yet been applied. If no rows are returned, it implies all log files received have been applied. This property pertains to a standby database.

The table contains the following columns in the order shown:

• STATUS

  The STATUS column is set to one of the following values for a log file on a logical standby database:

  • NOT_APPLIED: No redo records in this log file have been applied.

  • PARTIALLY_APPLIED: Some of the redo records in this log file have been applied while others have not.

  • COMMITTED_TRANSACTIONS_APPLIED: This status value only applies to a logical standby database. All redo records belonging to the committed transactions have been applied. Redo records belonging to uncommitted transactions have not been read by logminer and may still be needed when the transactions are committed in the future. Therefore, it is not safe yet to discard this online redo log file.

• RESETLOGS_ID

  Resetlogs identifier associated with the archived redo log file

• THREAD

  The redo thread number

• LOG_SEQ

  The online redo log file sequence number

• TIME_GENERATED

  The first time when the online redo log file was written to the primary database

• TIME_COMPLETED

  The next time when the log file was archived on the primary database (corresponds to the NEXT_CHANGE# column)

• FIRST_CHANGE#

  First change number in the archived redo log file

• NEXT_CHANGE#

  First change in the next log file

• SIZE (KBs)

  The SIZE of the online redo log file in kilobytes

For example:

DGMGRL> SHOW DATABASE 'DR_Sales' 'RecvQEntries' ;
              STATUS     RESETLOGS_ID           THREAD
LOG_SEQ          TIME_GENERATED       TIME_COMPLETED    FIRST_CHANGE#
NEXT_CHANGE#        SIZE (KBs)
         NOT_APPLIED        497198843                1                    5
06/20/2003 14:55:38  06/20/2003 16:31:26           202138
210718             7364
         NOT_APPLIED        497198843                1                    6
06/20/2003 16:31:26  06/20/2003 16:31:39           210718
210753               13
         NOT_APPLIED        497198843                1                    7
06/20/2003 16:31:39  06/20/2003 16:31:54           210753
210758                1
         NOT_APPLIED        497198843                1                    8
06/20/2003 16:31:54  06/20/2003 16:31:59           210758
210789               11

8.1.10 SendQEntries (Send Queue Entries)

The SendQEntries property returns a table that shows all log files on the primary database that were not successfully archived to one or more standby databases. This property pertains to the primary database.

The table contains the following columns:

• STANDBY_NAME

  The value can be empty or it can contain the database unique name (DB_UNIQUE_NAME) of the standby database. If empty, the STATUS column will contain a value of CURRENT or NOT_ARCHIVED.

• STATUS

  The STATUS column is set to one of the following values:

  • CURRENT: A log file to which online redo is currently being written.

  • NOT_ARCHIVED: A completed online redo log file that has not been archived locally.

  • ARCHIVED: A completed log file that has been archived locally but has not been transmitted to the standby database specified in the STANDBY_NAME column.

  The table contains exactly one row with the value of STATUS=CURRENT. There can be multiple rows with the value STATUS=ARCHIVED or STATUS=NOT_ARCHIVED.

• RESETLOGS_ID

  Resetlogs identifier associated with the archived redo log file

• THREAD

  The redo thread number.

• LOG_SEQ

  The log sequence number. Multiple rows may have the same LOG_SEQ value (for different STANDBY_NAME values).

• TIME_GENERATED

  The first time when the online redo log file was written to the primary database.

• TIME_COMPLETED

  The next time when the log file was archived on the primary database (corresponds to the NEXT_CHANGE# column).

• FIRST_CHANGE#

  First change number in the archived redo log file.

• NEXT_CHANGE#

  First change in the next log file.

• SIZE (KBs)

  The SIZE of the online redo log file in kilobytes.

For example, the following shows output from a SHOW DATABASE command:

DGMGRL> SHOW DATABASE 'North_Sales' 'SendQEntries' ;
PRIMARY_SEND_QUEUE
        STANDBY_NAME       STATUS     RESETLOGS_ID
THREAD              LOG_SEQ       TIME_GENERATED       TIME_COMPLETED
FIRST_CHANGE#     NEXT_CHANGE#       SIZE (KBs)
       reportdbade52     ARCHIVED        497198843
1                    9  06/20/2003 16:31:59  06/20/2003 16:39:57
210789           211411              186
       reportdbade52     ARCHIVED        497198843
1                   10  06/20/2003 16:39:57  06/20/2003 16:40:01
211411           211415                1
       reportdbade52     ARCHIVED        497198843
1                   11  06/20/2003 16:40:01  06/20/2003 16:40:07
211415           211418                1
                          CURRENT        497198843
1                   12  06/20/2003 16:40:07
211418                                 1

8.1.11 StatusReport (Status Report)

The StatusReport property returns a table that provides a list of errors or warnings about the status of the database. In a RAC database environment, it also includes the status of all running instances. Each individual database has this property. The table contains the following columns in the order shown:

• INSTANCE_NAME

  The value matching the SID for the instance.

• ERROR_TEXT

  Formatted error text.

• SEVERITY

  The severity of the error message. The value is either WARNING or ERROR.

For example, the following shows output from a SHOW DATABASE command:

DGMGRL> SHOW DATABASE 'North_Sales' 'StatusReport' ;
STATUS REPORT
       INSTANCE_NAME   SEVERITY ERROR_TEXT
             sales1      ERROR ORA-16737: The log transport service for
standby "DR_Sales" has an error.
                   *      ERROR ORA-16745: unable to add DB_UNIQUE_NAME DR_Sales
into The DG_CONFIG list because it is full

8.1.12 TopWaitEvents

Specifies the 5 events with the longest waiting time in the specified instance. The events and their waiting time are retrieved from V$SYSTEM_EVENT. Each instance in the configuration has this property. This property is an instance level monitorable property. The table contains the following columns in the order shown:

• Event

  The system wait event.

• Wait Time

  The total amount of time waited for this event in hundredths of a second.

The following example shows output from a SHOW INSTANCE command:

DGMGRL> show instance dg10 'TopWaitEvents';
TOP SYSTEM WAIT EVENTS
               Event            Wait Time
   rdbms ipc message               671350
SQL*Net message from client         62390
          pmon timer                47897
  Queue Monitor Wait                43016
 wakeup time manager                38508

8.2.1 AlternateLocation

Specifies an alternate disk location to store the archived redo log files in the standby when the location specified by the StandbyArchiveLocation fails. The property has an instance scope, and the location it specifies has to be accessible by the instance.

8.2.2 ApplyInstanceTimeout

Specifies the number of seconds the broker waits after detecting the current apply instance failed and before initiating the apply instance failover.

8.2.3 ApplyNext

Specifies the number of archived redo log files that log apply services should apply immediately to the physical standby database, temporarily overriding any apply delay interval previously specified by the DelayMins property. The ApplyNext property value is applied only at the point when you explicitly specify that value. Once the value is applied, the property no longer has any effect until the next time that its value is explicitly specified.

Specifying a value for this property has no effect and will be ignored if broker management of the standby database is disabled or if log apply services are offline at the time that a value is specified. Specifying a zero value for this property always has no effect on the current behavior of log apply services.

The last value specified for this property may be displayed using the CLI SHOW command.

8.2.4 ApplyNoDelay

Specifies whether or not to cancel the effect of the DelayMins property that was set on the standby database:

• If log apply services are online and you set ApplyNoDelay=YES, log apply services apply the archived redo log files as soon as they are archived to the standby database. This property is equivalent to using the following SQL statements.

  On a physical standby database:

  ALTER DATABASE RECOVER MANAGED STANDBY DATABASE NODELAY;
  
  

  On a logical standby database:

  ALTER DATABASE START LOGICAL STANDBY APPLY IMMEDIATE;
  
  

• If log apply services are online and you set ApplyNoDelay=NO, log apply services respect the delay settings specified by the DelayMins property of the standby database. This property is equivalent to using the following SQL statements.

  On a physical standby database:

  ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DEFAULT DELAY;
  
  

  On a logical standby database:

  EXECUTE DBMS_LOGSTDBY.APPLY_UNSET('APPLY DELAY');
  
  

• If log apply services are offline, then setting the property has no immediate effect. However, when log apply services are online again, the value of the property is used to determine the apply delay behavior of log apply services.

The value of the ApplyNoDelay property persists through role changes. For example, if the ApplyNoDelay property is set to YES and the database undergoes a series of switchover operations, transitioning the database from the standby role to the primary role and then back again, the ApplyNoDelay property will continue to be set to YES throughout all of the role changes.

8.2.5 ApplyParallel

Specifies the number of concurrent processes log apply services can use on the physical standby database for Redo Apply. If log apply services are offline, then setting the property has no immediate effect. However, when log apply services are online again, the value of the property is used to determine the parallel apply behavior of log apply services.

8.2.6 ArchiveLagTarget

Limits the amount of data that can be lost and effectively increases the availability of the standby database by forcing a log switch after the amount of time you specify (in seconds) elapses. That way, the standby database will not miss redo records generated from a time range longer than the value set for the ARCHIVE_LAG_TARGET initialization parameter.

8.2.7 AsyncBlocks

Specifies the size of the SGA buffer to be used when network I/O operations are to be done asynchronously using the log writer process (LGWR). The value you set for AsyncBlocks property takes effect only when the LogXptMode property is set to ASYNC.

8.2.8 Binding

Specifies whether or not the standby destination is MANDATORY or OPTIONAL.

8.2.9 DbFileNameConvert

Distinguishes standby datafile filenames from primary datafile filenames. You must set this property on all standby databases. If you add a datafile to the primary database, this property converts the datafile name on the primary database to the datafile on the standby database.

This property is used in the following situations:

• At standby mount time, it is used to rename primary datafile filenames to standby datafile filenames if the datafile file path on the standby system is different from the primary database system.

• When a new datafile is created on the primary database, a corresponding new datafile will be created on the standby database if the StandbyFileManagement property is set to 'AUTO'. Oracle uses the datafile file path mapping information from the DbFileNameConvert property to determine the standby file path of the new standby datafile. If the StandbyFileManagement property is set to 'MANUAL', you must add a corresponding file to the standby database.

  Category	Description
  Datatype	String
  Valid values	Set the value of this parameter to a list of string pairs: The first string is the substring found in the datafile names on the primary database. The second string is the substring found in the datafile names on the standby database. For example, ('string1', 'string2', 'string3', 'string4',...) Where: string1 is the substring of the primary database filename. string2 is the substring of the standby database filename. string3 is the substring of the primary database filename. string4 is the substring of the standby database filename.
  Broker default	' '
  Imported?	Yes, from the DB_FILE_NAME_CONVERT initialization parameter
  Parameter class	Static
  Role	Standby
  Standby type	Physical
  Corresponds to ...	DB_FILE_NAME_CONVERT initialization parameter
  Scope	Database
  GUI name	DB File Name Convert

  
  

8.2.10 DelayMins

Specifies the number of minutes log apply services will delay applying the archived redo log files on the standby database.

8.2.11 Dependency

Specifies the database unique (DB_UNIQUE_NAME) name (can be the primary or a standby database name) on which this database depends for receiving archived redo log files.

8.2.12 HostName

Specifies the name of the host on which the instance is running. The property can only be updated when broker management of the database is disabled. You should only update the value when the host is renamed, in which case you need to disable broker management of the database, update the HostName property to match with the new host name, and then reenable broker management of the database.

8.2.13 InitialConnectIdentifier

Specifies the initial connection identifier the broker uses to make the first connection to a database. If using the CLI, you supply the value when you enter the CREATE CONFIGURATION or ADD DATABASE command. If using the GUI, the value is supplied by the GUI automatically. You should only update the value of this property when the original value has an error and the broker cannot connect to the database when creating the configuration or adding a database.

8.2.14 LocalListenerAddress

Specifies the listener address at which the instance is registered. The property can only be updated when broker management of the database is disabled. You should only update the value when the LOCAL_LISTENER initialization parameter value is being changed, in which case you need to:

1. Disable broker management of the database

2. Update the LOCAL_LISTENER initialization parameter value

3. Update the LocalListenerAddress property in listener ADDRESS format to match with the new LOCAL_LISTENER address

4. Reenable broker management of the database

In the event that the LOCAL_LISTENER initialization parameter value of instances belonging to more than one database is being changed, it is recommended to:

1. Disable the configuration

2. Make the LOCAL_LISTENER initialization parameter value changes at all of the instances

3. Make the LocalListenerAddress property changes for all of the affected instances

4. Enable the configuration

8.2.15 LogArchiveFormat

Specifies the format for filenames of archived redo log files using a database ID (%d), thread (%t), sequence number (%s), and resetlogs ID (%r).

8.2.16 LogArchiveMaxProcesses

Specifies the initial number of archiver background processes (ARC0 through ARC9) the Oracle database invokes. The actual number of archiver processes in use may increase subsequently based on archive workload.

8.2.17 LogArchiveMinSucceedDest

Controls when online redo log files are available for reuse. For the online redo log files to be available for reuse, archiving must succeed to a minimum number of destinations.

8.2.18 LogArchiveTrace

Set this parameter to an integer value to see the progression of the archiving of online redo log files on the primary and the standby databases. The Oracle database writes an audit trail of the archived redo log files received from the primary database into process trace files.

8.2.19 LogFileNameConvert

Converts the filename of an online redo log file on the primary database to the filename of a corresponding online redo log file on the standby database.

8.2.20 LogShipping

Specifies whether or not log transport services can send archived redo log files to the particular standby database. The broker uses the value of the LogShipping property only when the primary database is in the ONLINE state:

• If the primary database is in the LOG-TRANSPORT-OFF state, then log transport services are offline to all standby databases, regardless of whether or not the LogShipping property is set to ON or OFF.

• If the primary database is in the ONLINE state and the value of the LogShipping property is ON, then log transport services are enabled to send archived redo log files to the particular standby database. If the LogShipping property is OFF, then log transport services are disabled to send archived redo log files to the particular standby database.

  Category	Description
  Datatype	String
  Valid values	ON or OFF
  Broker default	ON
  Imported?	No
  Parameter class	Dynamic
  Role	StandbyFoot 1
  Standby type	Physical and logical
  Corresponds to ...	ENABLE and DEFER values for the LOG_ARCHIVE_DEST_STATE_n initialization parameter of the primary database
  Scope	Database
  GUI name	Log Shipping

  
  
  ^Footnote 1 Although this property is set for the standby database, it is indirectly related to the log transport services for the primary database. The broker propagates the setting you specify on the standby database to the corresponding attributes of the LOG_ARCHIVE_DEST_n value of the primary database.
  

8.2.21 LogXptMode

Enables you to set the log transport mode. You set the log transport services on each standby database to one of the following modes:

• SYNC

  Configures log transport services for this standby database using the LGWR, SYNC, and AFFIRM attributes of the LOG_ARCHIVE_DEST_n initialization parameter. Standby redo log files are required. This mode is required for the maximum protection or maximum availability data protection modes. This log transport mode enables the highest grade of data protection to the primary database, but also incurs the highest performance impact.

• ASYNC

  Configures log transport services for this standby database using the LGWR, ASYNC, and NOAFFIRM attributes of the LOG_ARCHIVE_DEST_n initialization parameter. Standby redo log files are required. This mode enables a moderate grade of data protection to the primary database, and incurs a lower performance impact than SYNC.

• ARCH

  Configures log transport services for this standby database using the ARCH attribute of the LOG_ARCHIVE_DEST_n initialization parameter. Standby redo log files are not required. This mode enables the lowest grade of data protection to the primary database, and incurs the lowest performance impact. This is the default setting.

  Category	Description
  Datatype	String
  Valid values	SYNC or ASYNC or ARCH
  Broker default	ASYNC for standby databases with standby redo log files ARCH for standby databases without standby redo log files
  Imported?	Yes, from the ARCHIVER, TRANSMIT_MODE, and AFFIRM columns of V$ARCHIVE_DEST view of the primary database
  Parameter class	Dynamic
  Role	StandbyFoot 1
  Standby type	Physical or logical
  Corresponds to ...	ARCH, LGWR, SYNC, ASYNC, AFFIRM, and NOAFFIRM attributes for the LOG_ARCHIVE_DEST_n initialization parameter of the primary database ARCHIVER, TRANSMIT_MODE, and AFFIRM columns of V$ARCHIVE_DEST view of the primary database
  Scope	Database
  GUI name	Log Transport Mode

  
  
  ^Footnote 1 Although this property is set for the standby database, it is indirectly related to the log transport services for the primary database. The broker propagates the setting you specify on the standby database to the corresponding attributes of the LOG_ARCHIVE_DEST_n value of the primary database.
  
  
  

  See Also: Chapter 3 for more information about setting data protection modes for log transport services

  
  

8.2.22 LsbyASkipCfgPr

Adds a skip specification to log apply services. It provides a way to control the apply service to skip (ignore) SQL statements that you do not want to apply to the logical standby database. The SKIP operation:

• Sets the criteria for identifying the SQL statements that will not be applied to the standby database

• Specifies any additional processing that will be done, if necessary

Specifying a value for this property has no effect and will be ignored if management of the standby database is disabled.

8.2.23 LsbyASkipErrorCfgPr

Adds a skip error specification to log apply services. It provides criteria to determine if an error should cause log apply services to stop. All errors to be skipped are stored in system tables that describe how exceptions should be handled.

Specifying a value for this property has no effect and will be ignored if management of the standby database is disabled.

8.2.24 LsbyASkipTxnCfgPr

Skips over a transaction that caused the log apply services to stop applying transactions to the logical standby database. This property enables you to specify the transaction ID (XIDSQN NUMBER) of the problematic transaction that you want log apply services to ignore. Before you restart log apply services, you should issue a SQL transaction that will correctly update the logical standby database in place of the skipped transaction. Applying a compensating transaction will help keep the logical standby database transactionally consistent with the primary database.

Specifying a value for this property has no effect and will be ignored if management of the standby database is disabled.

8.2.25 LsbyDSkipCfgPr

Deletes an existing skip specification from log apply services. It reverses or removes the actions of the LsbyASkipCfgPr property by finding the record, matching all the parameters, and removing the record from the system table. The match must be exact, and multiple skip actions can be removed only by a matching number of unskip actions. You cannot remove multiple skip actions by using wildcard characters as a value to this property.

Specifying a value for this property has no effect and will be ignored if management of the standby database is disabled.

8.2.26 LsbyDSkipErrorCfgPr

Deletes an existing skip error specification from log apply services. It reverses or removes the actions of the LsbyASkipErrorCfgPr property by finding the record, matching all of the parameters and removing the record from the system table. The match must be exact, and multiple skip actions can be removed only by a matching number of unskip actions. You cannot remove multiple skip actions by using wildcard characters as a value to this property.

Specifying a value for this property has no effect and will be ignored if management of the standby database is disabled.

8.2.27 LsbyDSkipTxnCfgPr

Reverses or removes the actions of the LsbyASkipTxnCfgPr property. The transaction IDs must match exactly, and multiple skip transaction actions can be removed only by a matching number of unskip transaction actions. You cannot remove multiple skip transaction actions by using wildcard characters as a value to this property.

Specifying a value for this property has no effect and will be ignored if management of the standby database is disabled.

8.2.28 LsbyMaxEventsRecorded

Specifies the number of events that will be stored in the DBA_LOGSTDBY_EVENTS table, which stores logical standby event information.

8.2.29 LsbyMaxSga

Specifies the number of megabytes for the allocation of log apply services cache in the system global area (SGA). If the value is 0, log apply services use one quarter of the value set for the SHARED_POOL_SIZE initialization parameter.

8.2.30 LsbyMaxServers

Specifies the number of parallel query servers specifically reserved for log apply services. If the value is 0, log apply services use all available parallel query servers to read the log files and apply changes.

8.2.31 LsbyRecordAppliedDdl

Controls whether or not DDL statements that were applied to the logical standby database are recorded in the DBA_LOGSTDBY_EVENTS table. Specify one of the following values:

• TRUE: DDL statements applied to the logical standby database are recorded in the DBA_LOGSTDBY_EVENTS table. This is the default parameter setting.

• FALSE: Applied DDL statements are not recorded.

  Category	Description
  Datatype	String
  Valid values	TRUE or FALSE
  Broker default	TRUE
  Imported?	Yes, from the RECORD_APPLIED_DDL row of SYSTEM.LOGSTDBY$PARAMETERS
  Parameter class	Not applicable
  Role	Standby
  Standby type	Logical
  Corresponds to ...	DBMS_LOGSTDBY.APPLY_SET('RECORD_APPLIED_DDL') and the DBMS_LOGSTDBY.APPLY_UNSET('RECORD_APPLIED_DDL') procedures
  Scope	Database
  GUI name	Record Applied DDL

  
  

8.2.32 LsbyRecordSkipDdl

Controls whether or not skipped DDL statements are recorded in the DBA_LOGSTDBY_EVENTS table. Specify one of the following values:

• TRUE: Skipped DDL statements are recorded in the DBA_LOGSTDBY_EVENTS table. This is the default parameter setting.

• FALSE: Skipped DDL statements are not recorded in the DBA_LOGSTDBY_EVENTS table.

  Category	Description
  Datatype	String
  Valid values	TRUE or FALSE
  Broker default	TRUE
  Imported?	Yes, from the RECORD_SKIP_DDL row of SYSTEM.LOGSTDBY$PARAMETERS
  Parameter class	Not applicable
  Role	Standby
  Standby type	Logical
  Corresponds to ...	DBMS_LOGSTDBY.APPLY_SET('RECORD_SKIP_DDL') and the DBMS_LOGSTDBY.APPLY_UNSET('RECORD_SKIP_DDL') procedures
  Scope	Database
  GUI name	Record Skip DDL

  
  

8.2.33 LsbyRecordSkipErrors

Controls whether or not skipped errors (as described by the DBMS_LOGSTDBY.SKIP_ERROR procedure) are recorded in the DBA_LOGSTDBY_EVENTS table. Specify one of the following values:

• TRUE: Skipped errors are recorded in the DBA_LOGSTDBY_EVENTS table.

• FALSE: Skipped errors are not recorded in the DBA_LOGSTDBY_EVENTS table.

  Category	Description
  Datatype	String
  Valid values	TRUE or FALSE
  Broker default	TRUE
  Imported?	Yes, from the RECORD_SKIP_ERRORS row of SYSTEM.LOGSTDBY$PARAMETERS
  Parameter class	Not applicable
  Role	Standby
  Standby type	Logical
  Corresponds to	DBMS_LOGSTDBY.APPLY_SET('RECORD_SKIP_ERRORS') and the DBMS_LOGSTDBY.APPLY_UNSET('RECORD_SKIP_ERRORS') procedures
  Scope	Database
  GUI name	Record Skip Errors

  
  

8.2.34 LsbyTxnConsistency

Controls the level of transaction consistency maintained between the primary and standby databases. Specify one of the following values:

• FULL: Transactions are applied to the logical standby database in the exact order in which they were committed on the primary database. This option may affect performance.

• READ_ONLY: Transactions are committed out of order (which provides better performance). SQL SELECT statements return read-consistent results. This is particularly beneficial when the logical standby database is being used to generate reports.

  
  

  Note: DML statements involving standby tables are not allowed in this mode.

  
  

• NONE: Transactions are committed out of order and no attempt is made to provide read-consistent results. This results in the best performance of the three modes. If applications reading the logical standby database make no assumptions about transaction order, this option works well.

  Category	Description
  Datatype	String
  Valid values	FULL or READ_ONLY or NONE
  Broker default	FULL
  Imported?	Yes, from the TRANSACTION_CONSISTENCY row of SYSTEM.LOGSTDBY$PARAMETERS
  Parameter class	Not applicable
  Role	Standby
  Standby type	Logical
  Corresponds to ...	DBMS_LOGSTDBY.APPLY_SET('TRANSACTION_CONSISTENCY') and the DBMS_LOGSTDBY.APPLY_UNSET('TRANSACTION_CONSISTENCY') procedures
  Scope	Database
  GUI name	Transaction Consistency Level

  
  

8.2.35 MaxFailure

Specifies the maximum number of contiguous archiving failures before the log transport services stop trying to transport archived redo log files to the standby database. A value of zero indicates that an unlimited number of failures are allowed.

8.2.36 NetTimeout

Specifies the number of seconds the LGWR waits for Oracle Net Services to respond to a LGWR request. It is used to bypass the long connection timeout in TCP. This property is only used when the LogXptMode property of the same database is set to SYNC or ASYNC.

8.2.37 PreferredApplyInstance

Indicates that a particular instance is the preferred choice for serving log apply services. It is only used when the database is a standby RAC database. The value could be an empty string (default) which means the broker chooses the apply instance.

8.2.38 RealTimeApply

Turns on and off the real-time apply feature of the physical or logical standby database. You need to set up standby redo log files to use the real-time apply feature. Once real-time apply is turned on, the apply delay feature is automatically turned off.

8.2.39 ReopenSecs

Specifies the minimum number of seconds before the archiver process (ARCn, foreground, or log writer process) should try again to access a previously failed destination.

8.2.40 SidName

Specifies the SID of the instance. The property can only be updated when broker management of the database is disabled. You should only update the value when the SID is changed, in which case you need to disable broker management of the database, update the SidName property to match with the new SID, and reenable broker management of the database.

8.2.41 StandbyArchiveLocation

Specifies the location of archived redo log files arriving from a primary database. Oracle recommends that you always explicitly set the value (if flash recovery area is not in use).

8.2.42 StandbyFileManagement

Affects how the add datafile operation on the primary database is applied on the standby database. If this property is set to AUTO, in conjunction with valid settings in the DbFileNameConvert property, a corresponding new datafile is automatically created on the standby database. The location of this new standby datafile is determined by the value of the DbFileNameConvert property.

If this property is set to MANUAL, you have to create the correct new datafile on the standby database manually.