Table of Contents
Maintaining BerkeleyDB Databases
Introduction
j-chkmail uses two kinds of databases :
- CDB (constant databases) -
- WDB (working databases) -
j-makemap tool
BerkeleyDB command line tools
BerkeleyDB package come with some command line tools to help you maintaining j-chkmail databases :
- db_archive
- db_checkpoint
- db_deadlock
- db_dump
- db_hotbackup
- db_load
- db_printlog
- db_recover
- db_stat
- db_upgrade
- db_verify
These tools are installed inside /var/jchkmail/dbtools. Documentation for these tools can be find at BerkeleyDB utilities documentation, at the library distribution or at Oracle web site.
Database Hot-Backup
A good thing is to periodically backup working databases. You can use db_hotbackup, launched by cron :
10 0,6,12,18 * * * cd /var/jchkmail; bin/backup-wdb
Where backup-wdb script is as follows :
#! /bin/sh cd /var/jchkmail dbtools/db_hotbackup -v -h wdb -b backup-me chown -hR smmsp:smmsp backup-me chmod 660 backup-me/log* chmod 664 backup-me/*db
To restore working databases if they become corrupted, just replace the contents of working database directory (/var/jchkmail/wdb) by the backup :
#! /bin/sh /etc/init.d/jchkmail stop cd /var/jchkmail rm -f wdb/* cp -p backup-me/* wdb/ /etc/init.d/jchkmail start
Notes
j-chkmail uses BerkeleyDB database manager. To avoid compatibility problems with other possibly already installed versions, BerkeleyDB source code is distributed with j-chkmail, without its documentation, to reduce size. You can get all original BerkeleyDB stuff from Oracle.
