Scheduled Tasks via Cron

crontab -e

## SAMPLE CRONTAB 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.
##
## NOTE: You may also need to add additional sysadmin related tasks to your crontab 
## (e.g. zipping up old log files, or even removing old logs, etc).

#-----------------
# 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).
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 at midnight every day
# NOTE: ONLY NECESSARY IF YOU ARE RUNNING OAI-PMH 
# (This ensures new content is available via OAI-PMH)
0 0 * * * $DSPACE/bin/dspace oai import > /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

# run the index-authority script once a day at 12:45 to ensure the Solr Authority cache is up to date
45 0 * * * $DSPACE/bin/dspace index-authority > /dev/null

 # Cleanup Web Spiders from DSpace Statistics Solr Index at 01:00 every day
# NOTE: ONLY NECESSARY IF YOU ARE RUNNING SOLR STATISTICS
# (This removes any known web spiders from your usage statistics)
0 1 * * * $DSPACE/bin/dspace stats-util -i

# 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

# Run any Curation Tasks queued from the Admin UI at 04:00 every day
# (Ensures that any curation task that an administrator "queued" from the Admin UI is executed 
# asynchronously behind the scenes)
0 4 * * * $DSPACE/bin/dspace curate -q admin_ui

#----------------
# WEEKLY TASKS 
# (Recommended to be run once per week, but can be run more or less frequently, based on your local needs/policies)
#----------------
# Run the checksum checker at 04:00 every Sunday
# By default it runs through every file (-l) and also prunes old results (-p) 
# (This re-verifies the checksums of all files stored in DSpace. If any files have been changed/corrupted, checksums will differ.)
0 4 * * 0 $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 commented-out 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 configured "mail.admin" 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

#----------------
# MONTHLY TASKS
# (Recommended to be run once per month, but can be run more or less frequently, based on your local needs/policies)
#----------------
# Permanently delete any bitstreams flagged as "deleted" in DSpace, on the first of every month at 01:00
# (This ensures that any files which were deleted from DSpace are actually removed from your local filesystem. 
#  By default they are just marked as deleted, but are not removed from the filesystem.) 
0 1 1 * * $DSPACE/bin/dspace cleanup > /dev/null

#----------------
# YEARLY TASKS (Recommended to be run once per year)
#----------------
# At 2:00AM every January 1, "shard" the DSpace Statistics Solr index. 
# This ensures each year has its own Solr index, which improves performance.
# NOTE: ONLY NECESSARY IF YOU ARE RUNNING SOLR STATISTICS
# NOTE: This is scheduled here for 2:00AM so that it happens *after* the daily cleaning of this index.
0 2 1 1 * $DSPACE/bin/dspace stats-util -s