When the database is updated during an updatable backup hold, the additional amount of system log information shown by the following formula is output. For a HiRDB single server configuration, add the amount of system log information found here to the amount of log information output by a single server. For a HiRDB parallel server configuration, add the corresponding amounts of log information for the back-end servers and dictionary servers that manage the RDAREAs that are being updated.

However, when HiRDB terminates abnormally or is forcibly terminated during a backup hold, the backup hold is not inherited when HiRDB restarts (unless it is a reference-possible backup hold). For this reason, the system log information calculated here is not output.

Formula

a (Si + 200) Ti i=1

a: Number of RDAREAs updated during the updatable backup hold

Si: Page size of RDAREAs (bytes)

Ti: Number of update pages of RDAREA updated during the updatable backup hold

Use the following procedure to find the number of RDAREA update pages.

Procedure

1. Execute the statistics analysis utility (HiRDB file statistical information pertaining to database manipulation) at the following points:
   At the start of the updatable backup hold
   At the release of the updatable backup hold
   
2. Check the number of synchronization WRITEs (SYNC-W) to find the number of update pages from that differential.