Basic script for offline compaction.

offline-compaction.sh

aemdir=/Users/hemanth/Projects/AEM_6_2_Instance/author
today="$(date +'%Y-%m-%d-%H-%M-%S')"
compactdir="$aemdir/help"
crxdir="$aemdir/crx-quickstart"
oakrun="$compactdir/oak-run-*.jar"
logfile="$compactdir/compact-log-$today.log"

echo "" > $logfile
echo "Compaction directory: ${compactdir}..." | tee -a $logfile
echo "Quickstart directory: ${crxdir}..." | tee -a $logfile

repospace=$(du -hs $crxdir/repository)
echo "Pre-compaction repository size: ${repospace}..." | tee -a $logfile

echo "Finding old checkpoints..." | tee -a $logfile
java -Dtar.memoryMapped=true -Xmx8g -jar $oakrun checkpoints $crxdir/repository/segmentstore >> $logfile

echo "Deleting unreferenced checkpoints..."
java -Dtar.memoryMapped=true -Xmx8g -jar $oakrun checkpoints $crxdir/repository/segmentstore rm-unreferenced >> $logfile

echo "Running compaction. This may take a while..."
java -Dtar.memoryMapped=true -Xmx8g -jar $oakrun compact $crxdir/repository/segmentstore >> $logfile

echo "Compaction complete. Please check the log at: $logfile" | tee -a $logfile

repospace=$(du -hs $crxdir/repository)
echo "Post-compaction repository size: ${repospace}..." | tee -a $logfile

Note: AEM needs to be terminated before executing this script.

References:
https://helpx.adobe.com/experience-manager/kb/analyze-unusual-repository-growth.html
http://www.aemcq5tutorials.com/tutorials/online-offline-tar-compaction-in-aem/#run_online_tar_compaction