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Dbvisit Replicate offers automatic house keeping (housekeeping) on the following files:

  • Dbvisit Replicate plog files. These will get removed on source and target systems once they are no longer needed. The removal of these plogs can be found in the Mine/Apply log files by searching for "Removed plog".
  • Dbvisit Replicate log files. These are set managed to keep one backup file and a size limit of 100MB. This is configurable through the parameters:
    • LOG_FILE_SIZE
    • LOG_FILE_COUNT
    • LOG_FILE_DATE_ROTATE

Manual house keeping is required on the following files:

  • Dbvisit Replicate trace files
  • Dbvisit Replicate Cache files (see below)

Obsolete archive redo log files

To obtain a list of obsolete archived redo log files that are not needed by Dbvisit Replicate anymore and therefore maybe deleted (by RMAN), run the following command in Dbvisit Replicate command console:

 

 

 LIST OBSOLETE REDO [THREAD thread]

The oldest archive log that MINE will ever need is "last obsolete sequence" + 1

The oldest archive log that APPLY wil ever need is the sequence # that APPLY is working on

Scripting the output of the "list status" command

 To automate the management of Dbvisit Replicate further, the output of the list status command can be scripted. 

The commands are:

 

start-console.sh --silent engine mine send engine status  | grep Sequence
start-console.sh --silent engine apply send engine status  | grep Sequence

The Mine process returns the plog sequence and the redo sequence. If RAC is not used, then this number will be the same.

 

Dbvisit Replicate Cache files

The Dbvisit Replicate executable (dbvrep) is a self contained executable and contains all the necessary required libraries for it to function. These libraries are extracted out of the executable and into the default temporary directory of the system at startup of dbvrep. Dbvisit Replicate will reuse these cache files the next time that it is started. This maybe noticeable in the startup time of dbvrep. If the cache already exists, the startup time is faster.

It maybe possible that there are several cache directories. This can happen if a new version of Dbvisit Replicate is installed. The old cache directories can be removed, however when dbvrep is running, it is difficult to determine which is the current cache and which is the old cache. If the cache needs to be removed, then is preferable to shutdown dbvrep and then remove all cache files and then to restart dbvrep. 

The cache files are in the OS default temp directory under a directory called par-username. 

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