Context Indexing Performance

Question

If anyone can look at this that would be of great help.
The context index creation for a million rows is taking forever. We had let it run for 10 or so hours and it still was not finished so we had to cancel it.
We are creating the index as follows:
create index content_version_text_idx on content_version
(dummy_indexed_column)
indextype IS ctxsys.context parameters('datastore concat_cols_datastore sync (on commit)
section group ctxsys.auto_section_group');
The procedure used above in indexing is this:
CREATE OR REPLACE procedure concat_cols
(p_rowid IN ROWID,
p_clob IN OUT clob)
AS
v_clob CLOB :='';
title varchar2(7) := '<title>';
titlec varchar2(8) := '</title>';
detail varchar2(6) := '<DATA>';
detailc varchar2(7) := '</DATA>';
meta varchar2(6) := '<META>';
metac varchar2(7) := '</META>';
localecode varchar2(8) := '<LOCALE>';
localecodec varchar2(9) := '</LOCALE>';
BEGIN
FOR c1 IN
(SELECT content_id, content_data_id, version_number, content_title, isactive_flag
from content_version
WHERE ROWID = p_rowid
LOOP
FOR c0 IN
(SELECT ' ' || locale_iso_code as data
FROM content a1
WHERE c1.content_id = a1.content_id
LOOP
v_clob := v_clob || localecode;
v_clob := v_clob || c0.data;
v_clob := v_clob || localecodec;
END LOOP;
v_clob := v_clob || title;
v_clob := v_clob || c1.content_title;
v_clob := v_clob || titlec;
FOR c3 IN
(SELECT ' ' || content_data as data
FROM content_data b
WHERE b.content_data_id = c1.content_data_id
AND c1.isactive_flag = 1)
LOOP
v_clob := v_clob || detail;
v_clob := v_clob || c3.data;
v_clob := v_clob || detailc;
END LOOP;
FOR c4 IN
(SELECT ' ' || short_string_value || ' ' || long_string_value as data
FROM meta_value d
WHERE d.content_id = c1.content_id
AND d.version_number = c1.version_number
AND c1.isactive_flag = 1)
LOOP
v_clob := v_clob || meta;
v_clob := v_clob || c4.data;
v_clob := v_clob || metac;
END LOOP;
END LOOP;
p_clob := v_clob;
END concat_cols;
Anyone any ideas ?

Answer 1

OK have managed to reduce the indexing time by removing the xml tagging in the loop, instead am now using the sql to construct the tags when doing the select. so the sqls have now changed to
SELECT ' <data>'||content_data||'</data>' as data
FROM content_data b
WHERE b.content_data_id = c1.content_data_id
This change has brought the time for 30MB of data from around 8 mins to around 4.30 mins. Have noticed in the log that there are some rows that is taking lot of time to be indexed and because of that think that it is loosing around 40 seconds. Have turned on the logging to print the rowid but not sure what is causing these rows longer indexing time, these rows do not seem to contain any more data then the other rows.