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Posts Tagged ‘Index’

Oracle CTXSYS LEXER issues

January 17th, 2011 Comments off

Hello,

I recently tried to troubleshoot an application issue that was related to a text index. The index itself appeared in valid state but there was obviously some kind of a problem with it.
I started with the following

SQL> connect sys as sysdba
Enter password:
Connected.
SQL> DROP INDEX USER5.INDX71;
Index dropped.
SQL>CREATE INDEX USER5.INDX71 ON USER5.APP_NOTES (DETAIL_TEXT) INDEXTYPE IS CTXSYS.CONTEXT;
REATE INDEX USER5.INDX71 ON USER5.APP_NOTES (DETAIL_TEXT) INDEXTYPE IS CTXSYS.CONTEXT;
*
ERROR at line 1:
ORA-29855: error occurred in the execution of ODCIINDEXCREATE routine
ORA-20000: Oracle Text error:
DRG-10700: preference does not exist: CTXSYS.DEFAULT_LEXER
ORA-06512: at “CTXSYS.DRUE”, line 160
ORA-06512: at “CTXSYS.TEXTINDEXMETHODS”, line 364

There was something wrong with the CTXSYS schema and especially with the DEFAULT_LEXER.
I fixed this by reapplying the correct drdefXX.sql script for the database locale.

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Categories: Database, Oracle Tags: , , ,

Gather Schema and Index Statistics in Oracle

January 28th, 2010 2 comments

In this post I would like to draw your attention to the Optimizer in Oracle 10g.
The best place to start is the DBMS_STATS package reference page.

The DBMS_STATS package contains all the procedures required to maintain the optimizer statistics of any schema.
Once you get familiar with the documentation of the package, you will actually know which approach is best for your database and schemas. In my case I have to gather schema statistics once per week with a specific estimate_percent value and I have to gather schema index statistics every night. For this purpose I have created the following simple PL/SQL. I recommend if you create jobs and schedule them as appropriate.

-- Gathering Schema Statistics
execute dbms_stats.gather_schema_stats('SCHEMA1', estimate_percent=>39, cascade=>TRUE);
execute dbms_stats.gather_schema_stats('SCHEMA2', estimate_percent=>45, cascade=>TRUE);
-- Gathering Index Statistics
set serveroutput on
begin
for ind in
(select object_name
from user_objects
where object_type='INDEX'
and object_name like 'YOUR_INDEX_PATTERN_HERE'
)
loop
dbms_output.put_line('Gathering Index Statistics for '||ind.object_name||'.....');
dbms_stats.gather_index_stats('SHEMA1', ind.object_name , estimate_percent=>100);
dbms_output.put_line('Gathering Index Statistics for '||ind.object_name||' is Complete!');
end loop;
end;
/

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