HiRDB uses the statuses shown in the following table to manage status files.

Table 5-1 Status file statuses

Status	Description
Current	File is currently being used for output of system status information.
Spare	File is not currently being used for output of system status information, but it can be swapped with the current file if the current file becomes unavailable due to an I/O error. This file is in open status.
Reserved	File is closed and is not currently subject to output of system status information. A file is also placed in reserved status when its name has been specified in the HiRDB system definition but no status file has actually been created.
Shutdown	File has been shut down due to an error.

When HiRDB is started normally, the first status file specified in the following system definition operands becomes the current file; all other status files become spare files:

• pd_syssts_file_name_1 to pd_syssts_file_name_7 (unit status files)
• pd_sts_file_name_1 to pd_sts_file_name_7 (server status files)

Notes

• A file resulting in an open error is placed in reserved status. A file that cannot be opened due to an error is placed in shutdown status.
• When HiRDB is restarted, the file that was being used as the current file in the previous session is inherited.

When status files are swapped, the status of the status files changes. Status files are swapped at the following times:

• When an error occurs in the current status file
• When a space shortage occurs in the current status file
• When the pdstsswap command is executed

If an error occurs in either of the file versions, A or B, of the current file, HiRDB copies the contents of the normal file version into a spare file (the same information is contained in both versions A and B of the current file). HiRDB then places the spare file in current status and places in shutdown status the file that was being used as the current file. This processing is called status file swapping. If there is no spare file when HiRDB needs to perform status file swapping, the unit terminates abnormally. The following figure shows status file swapping.

Figure 5-1 Status file swapping

The following table lists the commands that are provided for manipulating status files.

Table 5-2 Commands used to manipulate status files

Command name	Description
pdstsinit	Initializes a status file.
pdstsopen	Opens a status file; also places a reserved file in spare status. Opens an initialized status file.
pdstscls	Closes a status file; also places a spare file in reserved status.
pdstsswap	Swaps status files and places the former current file in spare status.
pdstsrm	Deletes a status file.