Do CTXCAT/CATSEARCH indexes need maintenance???

Hi,
Today I dropped and re-created some of our CATSEARCH indexes. The only change was that I removed the NUMBERS-stopclass from the index configuration (to include numbers also in the text index).
I expected the indexes to grow (as we are indexing numbers additionally). But they did not. Instead index size reduced from 2.6GB to 1.7GB (ctx_report.index_size()). I did some further investigation with a small test table and found the following: When adding entries to the data table, the index tokens appear in $I table, also some entries are created in $P table. When removing the data from the text tables the $I table goes empty while $P still holds all the data.
So I think my indexes reduced their sizes because of the growing $P table which never seems to to be deleted. I am not sure if this is expected behaviour. But it wastes a of tablespace in our database.
My question: do CTXCAT indexes need maintenance? I know about optimize_index procedure which seems to be suiteable for CONTEXT indexes only. But I could not find anything similiar concerning CTXCAT in the documentation.
Thanks in advance.
PS: Oracle Version is 10.2.0.5.0
Edited by: user5740061 on Jan 6, 2011 12:39 AM

Hi,
I can confirm your findings. If you delete records from the table, records in dr$index_name$p are not deleted, tested today on 10.2.04, 11.1.07 and 11.2.1. I think this is, because there is no relation between the rows in the $P table and the records in the base table. So that is why, I think Oracle is not deleting any rows in the $P table. I did find out that if you truncate the base table, the $P table is also cleaned.
So the problem only occurs if you delete a lot of records and insert others again, delete again and again inserts. So my advice would be to keep record of the statistics on such table.
If you want more to know, maybe make a SR with Oracle Support (or maybe Roger can tell more).
Herald ten Dam
http://htendam.wordpress.com

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Edited by: orausern on Jan 17, 2013 1:43 AM

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SCOTT@orcl_11gR2> CREATE TABLE TEST_USER
2    (FIRST_NAME VARCHAR2(64 CHAR))
3 /
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SCOTT@orcl_11gR2>The only time that I am aware of that there is a conflict between a wordlist and a lexer is when you specify stemming in both. If you are using stemming, you can still use both a wordlist and a lexer, but only set the stemmer attribute in the wordlist, not the index_stems attribute in the lexer.

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