Memory leak in Oracle Text under Oracle 8.1.7!!!

Question

When I wanted to use USER_DATASOTRE preference to use my own formatting tag in Oracle Text, the memory leak occured in Oracle Text!
Memory just freed when I close SQL*Plus program
My formatting procedure is so easy
PROCEDURE format_tag(r IN ROWID, tlob IN OUT NOCOPY CLOB) IS
BEGIN
SELECT '<C>' &#0124; &#0124; catalog_id &#0124; &#0124; '</C></T>' &#0124; &#0124; tag_id &#0124; &#0124; '</T><V>' &#0124; &#0124; tag_value &#0124; &#0124; '</V>' INTO buf
FROM tbl_catalog WHERE ROWID=r;
dbms_lob.trim(tlob, 0); -- set LOB's size to zero
dbms_lob.write(tlob, length(buf), 1, buf);
END;
The typical rows are about 100,000 ( The actual records are tens of millions )
How can I solve this problem?

Answer 1

Thanks for your reply
I'm using Oracle 8.1.7.0.0 on Windows 2000
The preferences are as follows:
DECLARE
ds VARCHAR2(30):= 'dts_catalog';
grp VARCHAR2(30):= 'grp_catalog';
lxr VARCHAR2(30):= 'lxr_catalog';
wrd VARCHAR2(30):= 'wrd_catalog';
BEGIN
ctx_ddl.create_preference(wrd, 'BASIC_WORDLIST');
ctx_ddl.set_attribute(wrd, 'STEMMER', 'NULL');
ctx_ddl.create_preference(lxr, 'BASIC_LEXER');
ctx_ddl.set_attribute(lxr, 'INDEX_TEXT', 'TRUE');
ctx_ddl.set_attribute(lxr, 'INDEX_THEMES', 'FALSE');
ctx_ddl.create_preference(ds, 'USER_DATASTORE');
ctx_ddl.set_attribute(ds, 'OUTPUT_TYPE', 'VARCHAR2');
ctx_ddl.set_attribute(ds, 'PROCEDURE', 'pkg_catalog.format');
ctx_ddl.create_section_group(grp, 'BASIC_SECTION_GROUP');
ctx_ddl.add_field_section(grp, 'catalog', 'C', TRUE);
ctx_ddl.add_field_section(grp, 'tag', 'T', TRUE);
TRUE);
ctx_ddl.add_field_section(grp, 'value', 'V', TRUE);
END;
the STORAGE preferences are not here ( because they are long )
Index statement that I used for indexing
CREATE INDEX idx_catalog_info ON tbl_catalog_info(val)
INDEXTYPE IS ctxsys.context
PARAMETERS(
'STORAGE stg_catalog
DATASTORE dts_catalog
SECTION GROUP grp_catalog
LEXER lxr_catalog
WORDLIST wrd_catalog
MEMORY 24M'
I changed my last version of procedure and using VARCHAR2 parameter type instead of CLOB, but memory leak persist during building index.
so I used a simple trick by writing a package and counting the records to be indexed, after each 100,000 records I used DBMS_SESSION.FREE_UNUSED_USER_MEMORY procedure to free unused session's memory.
the package is as follows:
CREATE OR REPLACE PACKAGE pkg_catalog IS
PROCEDURE format(r ROWID, buf IN OUT NOCOPY VARCHAR2);
END pkg_catalog;
CREATE OR REPLACE PACKAGE BODY pkg_catalog IS
recs PLS_INTEGER:= 0;
PROCEDURE format(r ROWID, buf IN OUT NOCOPY VARCHAR2) IS
BEGIN
SELECT '<C>'&#0124; &#0124;catalog_id&#0124; &#0124;'</C><T>'&#0124; &#0124;tag_id&#0124; &#0124;subfield_id&#0124; &#0124;'</T><V>'&#0124; &#0124;val&#0124; &#0124;'</V>' INTO buf FROM &usr.tbl_catalog_info WHERE ROWID=r;
recs:= recs + 1;
IF recs>100000 THEN
recs:= 0;
dbms_session.free_unused_user_memory; -- clean-out memory garbage
END IF;
END format;
END pkg_catalog;
My problem solved, but it is very marvelous "Why Oracle does not free unused session's memory?"