Scheduled Tasks via Cron

crontab -e

## SAMPLE CRONJOB FOR A PRODUCTION DSPACE
## You obviously may wish to tweak this for your own installation, but this should give you an idea of what you likely wish to schedule via cron.
##

#-----------------
# GLOBAL VARIABLES
#-----------------
# Full path of your local DSpace Installation (e.g. /home/dspace or /dspace or similar)
# MAKE SURE TO CHANGE THIS VALUE!!!
DSPACE = [dspace]

# Shell to use
SHELL=/bin/sh

# Add all major 'bin' directories to path
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

# Set JAVA_OPTS with defaults for DSpace Cron Jobs.
# Only provides 512MB of memory by default (which should be enough for most sites). But, feel free to increase as needed to give more memory.
JAVA_OPTS="-Xmx512M -Xms512M -Dfile.encoding=UTF-8"

#--------------
# HOURLY TASKS (Recommended to be run multiple times per day, if possible)
# At a minimum these tasks should be run daily.
#--------------

# Regenerate DSpace Sitemaps every 8 hours (12AM, 8AM, 4PM). 
# SiteMaps ensure that your content is more findable in Google, Google Scholar, and other major search engines.
0 0,8,16 * * * $DSPACE/bin/dspace generate-sitemaps > /dev/null

#----------------
# DAILY TASKS (Recommended to be run once per day. Feel free to tweak the scheduled times below.)
#----------------

# Update the OAI-PMH index with the newest content (and re-optimize that index) at midnight every day
# (This is only necessary if you are running OAI-PMH. It ensures new content is available via OAI-PMH.
# It also ensures the OAI-PMH index is optimized for better performance)
0 0 * * * $DSPACE/bin/dspace oai import -o > /dev/null

# Clean and Update the Discovery indexes at midnight every day
# (This ensures that any deleted documents are cleaned from the Discovery search/browse index)
0 0 * * * $DSPACE/bin/dspace index-discovery > /dev/null

# Re-Optimize the Discovery indexes at 12:30 every day
# (This ensures that the Discovery Solr Index is re-optimized for better performance)
30 0 * * * $DSPACE/bin/dspace index-discovery -o > /dev/null

# Cleanup Web Spiders from DSpace Statistics Solr Index at 01:00 every day
# (This removes any known web spiders from your usage statistics)
0 1 * * * $DSPACE/bin/dspace stats-util -m -i -f

# Re-Optimize DSpace Statistics Solr Index at 01:30 every day
# (This ensures that the Statistics Solr Index is re-optimized for better performance)
30 1 * * * $DSPACE/bin/dspace stats-util -o

# Send out subscription e-mails at 02:00 every day
# (This sends an email to any users who have "subscribed" to a Collection, notifying them of newly added content.)
0 2 * * * $DSPACE/bin/dspace sub-daily

# Run the media filter at 03:00 every day. 
# (This task ensures that thumbnails are generated for newly add images, 
# and also ensures full text search is available for newly added PDF/Word/PPT/HTML documents)
0 3 * * * $DSPACE/bin/dspace filter-media

#----------------
# WEEKLY TASKS (Recommended to be run once per week, but can be run more or less frequently, based on your needs)
#----------------
# Run the checksum checker at 04:00 every Sunday
# (This re-verifies the checksums of all files stored in DSpace. If any files have been changed/corrupted, the checksums will differ.)
0 4 * * * $DSPACE/bin/dspace checker -l -p
# NOTE: LARGER SITES MAY WISH TO USE DIFFERENT OPTIONS. The above "-l" option tells DSpace to check *everything*. 
# If your site is very large, you may need to only check a portion of your content per week. 
# The below task would instead check all the content it can within *one hour*. The next week it would start again where it left off.
#0 4 * * 0 $DSPACE/bin/dspace checker -d 1h -p
  
# Mail the results of the checksum checker (see above) to the admin.email at 05:00 every Sunday
# (This ensures the system administrator is notified whether any checksums were found to be different.)
0 5 * * 0 [dspace]/bin/dspace checker-emailer -c