The available recovery methods depend on the situation in which an error occurred. The following figure shows the criteria for selecting the appropriate error recovery method.

Figure 9-1 Recovery method selection criteria

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If you cannot determine whether the system log file has been overwritten, choose the YES branch and continue with recovery processing. If an error occurs during recovery processing because of an overwritten system log file, re-execute the recovery processing starting from the NO branch.

If an error occurred only in the extraction information queue file, use the facility for recovering the extraction information queue file. If you use the data linkage recovery facility, you must recover the error at both the source and the target. If you use the facility for recovering the extraction information queue file, you need to recover the error only at the source.

The following table lists the errors that can be recovered by using the data linkage recovery facility (source system).

Table 9-5 Errors that can be recovered by using the data linkage recovery facility (source system)

Error event			Data linkage recovery facility
			Recovery via the system log file	Recovery via unload log files
Command error	The source Datareplicator was initialized.		Y	NR
	The pdrplstop command was executed (to stop data linkage) or the hdestart -i command was executed (to perform an initial start).		Y	NR
Disk error	Extraction information queue file	The source HiRDB's system log file has not been overwritten.	NR#	NR#
		The source HiRDB's system log file has been overwritten.	N	Y
	Extraction server status file		Y	NR
	Data linkage file		Y	NR
Insufficient disk capacity	Extraction information queue file		Y	NR

Legend:

Y: Can be recovered.

NR: Can be recovered, but this recovery method is not recommended.

N: Cannot be recovered.

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Use the facility for recovering the extraction information queue file.

The following table lists the errors that can be recovered by using the data linkage recovery facility (target system).

Table 9-6 Errors that can be recovered by using the data linkage recovery facility (target system)

Error event		Data linkage recovery facility
		Recovery via the system log file	Recovery via unload log files
Command error	The target Datareplicator was initialized.	Y	NR
Disk error	Import information queue file	Y	NR
Insufficient disk capacity	Import status file	Y	NR

Legend:

Y: Can be recovered.

NR: Can be recovered, but the recovery method indicated by Y is recommended.

For details about initialization, see 9.4 Initialization procedure during error recovery.

For details about recovery using the system log file with the data linkage recovery facility, see 9.5 Data linkage recovery via the system log file. For details about recovery using unload log files, see 9.6 Data linkage recovery via unload log files.

For details about the facility for recovering the extraction information queue file, see 9.7 Facility for recovering the extraction information queue file.