Data Recovery

On 2017-04-04 we had a rather major disk malfunction that caused data loss. The data on this site was originally restored from a 2016-11-05 backup, but with wiki pages changes since then recreated from the search index.

Note that files and images uploaded since November are still missing and will need to be re-uploaded and reattached to the pages by hand.

Please let us know if you find anything else missing or broken due to this outage. We thank you for your patience.

Search Index

The search engine in Tiki was rebuilt for Tiki7 this documentation applies only to versions 7 or later.

The search capabilities in tiki, such as those used by PluginList or the search at tiki-searchindex.php rely on a search index.

Tiki can support multiple search engines internally. Each of those will have different capabilities and limitations. The default engine should provide capabilities good enough for small and medium sites. Larger sites may need additional infrastructure to get the most performance.

Unified Index Comparison


Below is a matrix between the fields and the object types.

  • Tokenized, as in decomposed in words for full text search
  • Sortable

X Available
/ Static value
? Depends on the data

Tracker Fields

In general, tracker fields are indexed as tracker_field_PERMNAME/ID. PERMNAME/ID is your tracker field permanent name or ID. However, many tracker field types have additional useful variants of the main field (see below) that are indexed for each field.

The indexing for tracker fields will vary depending on the field type. As a general rule, tracker_field_PERMNAME/ID will be used as the field and will be sortable. However, there are a few exceptions:
  • Image and File fields are not indexed
  • TextArea is not sortable

Multilingual fields are indexed as multiple fields

  • The main one (tracker_field_PERMNAME/ID) contains all languages
  • tracker_field_PERMNAME/ID_lang contains one language only (tracker_field_12_fr for example)
  • tracker_field_PERMNAME/ID contains the average
  • tracker_field_PERMNAME/ID_sum contains the vote totals
  • tracker_field_PERMNAME/ID_count contains the number of votes
  • tracker_field_PERMNAME/ID_text contains the text instead of the IDs of the linked/listed items

Language of the tracker item

  • If a language field is set for the tracker item, that language is indexed as the item language, i.e. the language field.

Some used in buildQuery/tiki-searchindex.php (need explanation on whether these are real fields or just helpers):
type: refers to object_type
deep: if this is set, categories will be considered deep-categories
autocomplete: Will search for items with title starting with this

Rebuild search index

The index is stored at temp/unified-index/ While the rebuild is occuring, a directory temp/unified-index-new/ will appear (This is to permit the existing index to be used until the new one is ready). If temp/unified-index-new/ doesn't disappear after the indexing, something must have gone wrong. You can delete it and try the re-indexing again. You may want to run sh setup.sh to make sure the permissions are OK.

From the Tiki interface

You can visit this url: tiki-admin.php?page=search&rebuild=now and search index will be rebuilt if the site is small. For medium to high load sites, you can do that from the command line.

From the command line

The search index can be rebuilt from the command line, and since Tiki9 can be run using a Cron job where the server runs the command automatically - see Cron Job to Rebuild Search Index.

Below are the commands that may be used to rebuild the index.


Lucene Engine: Important note These commands need to be run as the web server user when using the Lucene implementation, often www-data or nobody depending on your server setup, otherwise the web server cannot update and maintain the index. This means prepending the following commands with "sudo -u www-data ".

All commands below assume you are already in the Tiki root directory.

Tiki9 and Tiki10

Basic command
php lib/search/shell.php rebuild;
sh setup.sh -n

Create a log too
If you are troubleshooting, and would like a log (which will be created in temp/Search_Indexer.log:
php lib/search/shell.php rebuild log

From Tiki11

From Tiki11, you can also rebuild it using the unified console.php command, with the appropriate parameters. For example:
Basic command
php console.php index:rebuild

<-- or -->

php console.php i:r


The syntax "i:r" is equivalent to "index:rebuild".

Multitiki sites
For multitiki sites, you can rebuild with commands like:
php console.php index:rebuild --site=site1.example.com  
php console.php index:rebuild --site=site2.example.com  

Successful rebuild
If the rebuild is successful a message like the following will be produced (for cron jobs, this can usually be sent to you via email as part of automatically running the command):
Started rebuilding index...
 wiki page: 150
 forum post: 67
 blog post: 412
 article: 61
 file: 1294
 trackeritem: 196
 comment: 0
Rebuilding index done
X-Powered-By: PHP/5.5.8
Content-type: text/html; charset=utf-8

If the rebuild is unsuccessful, instead of the above message you may get a message that indicates there has been an internal server error, or it may say "Rebuild in progress." This may be because the rebuild process uses more memory or takes more time than allowed by the server's php settings. Such settings can be changed on the fly as part of the rebuild command - examples of how to do this are shown below.

Increase memory limit
One way to increase memory is to change the memory_limit php setting as follows (this example changes the memory limit to 4 gigabytes while the rebuild process is running):
php -dmemory_limit=4G console.php i:r --log

You could also direct php to use a specific php.ini file, where there may be a higher memory limit setting or no limit. In this case you would use the -c parameter followed by the path to the php.ini file, as in the example below:
php -c /etc/php5/cli/php.ini console.php i:r --log

Increase maximum execution time
Getting an internal server error may indicate the rebuild process takes longer than the max_execution_time php setting. That can be increased as part of the command as shown below where the max execution time is set to 300 seconds, or 5 minutes. (This command is also increasing the memory limit as described above):
php -dmemory_limit=4G -dmax_execution_time=300 console.php i:r --log

Force rebuild
When the rebuild is unsuccessful with a "Rebuild in progress" message, this usually means that the rebuild failed previously in the middle of the process, leaving a temporary folder called temp/unified-index-new on the server. When a new rebuild is started and the program sees this folder, it thinks there is a rebuild already in progress and will stop. You can either delete this folder before rebuilding again or include the --force parameter in the rebuild command as follows:
php -dmemory_limit=4G -dmax_execution_time=300 console.php i:r --force --log


Developer Notes

Content sources

These can be found in lib/core/Search/ContentSource

What determines if a field is full-text searchable in the default contents field

For each indexed source, there is a getGlobalFields() function. If the field in question is listed as one of the keys of the returned array, then it can be searched using full-text in the default contents fields, in addition, if the value is set to true, then it is preserved after it is included in the contents field, otherwise it is discarded. For example:
function getGlobalFields()
		return array(
			'title' => true,  // included in contents field and the field itself is preserved
			'description' => true,  // included in contents field and the field itself is preserved

			'article_content' => false,  // included in contents field and the field itself is discarded thereafter
			'article_topline' => false, // included in contents field and the field itself is discarded thereafter
			'article_subtitle' => false, // included in contents field and the field itself is discarded thereafter
			'article_author' => false, // included in contents field and the field itself is discarded thereafter

Adding new fields to be indexed

  • Remember to add it to the getProvidedFields functions. That function is used to get a list of indexed fields to iterate through for various purposes within Tiki.
alias names for this page
Unified Search | UnifiedSearch | Enterprise search | Search Index | SearchIndex | UnifiedIndex | IndexRebuild | Index Rebuild






Keywords serve as "hubs" for navigation within the Tiki documentation. They correspond to development keywords (bug reports and feature requests):

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Wiki Plugin extends basic syntax
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