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Issue in fetching data by using XMLSERIALIZE

SIVAKUMRFeb 11 2025 — edited Feb 11 2025
SELECT XMLSERIALIZE ( DOCUMENT COLUMN1 AS CLOB NO INDENT) col1,
    XMLSERIALIZE ( DOCUMENT COLUMN2 AS CLOB NO INDENT) col2, etc.... 
    FROM tableName
    WHERE PK_ID = 100;

This select always returns 1 row.

The XMLSERIALIZE is applied on around 15+ columns.

Client executes the above statement sequentially to fetch and process all rows( around 2000).

For the first few executions, the XMLSERIALIZE returns data correctly but after it returns empty value even though the xmltype column has data init.

Could you please help what is casusing the issue here ?

ORACLE 19

Sga ASSM SIZE 12G

Large pool 3.5G

PGA AGGREGATE TARGET 3G.

If we use XMLTYPECOL1.GETCLOBVAL() Its returns data without any issue.

The IBM WTX Oracle adaptor issues this select statement in shared server mode

Comments

MartinBach-Oracle Jan 8 2025

Hi Salomon,

please have a look at this blog post written by @ulrike-schwinn-oracle :

https://blogs.oracle.com/coretec/post/easy-sql-statement-tracking-in23c

I hope this answers your question, if not, please shout!

- Martin

Solomon Yakobson Jan 8 2025

@martinbach-oracle - No, it doesn't answer my question. Article you pointed to shows uses:

SQL> alter system set sql_history_enabled=true scope=both;

And in my post I said “Works fine when enabled on system level”. My question was about

SQL> ALTER SESSION SET SQL_HISTORY_ENABLED = TRUE;

where I showed SQL history was NOT captured even though it should be based on SQL_HISTORY_ENABLED:

Modifiable **ALTER SESSION**, ALTER SYSTEM

SY.

MartinBach-Oracle Jan 8 2025

As per the article I shared the situation is as follows at the moment

  • You must enable SQL history PDB-wide (only a DBA can do that) so there's a certain level of control over the feature
  • Your session has access to the SQL history
  • If you don't want to record anything, set sql_history_enabled to false.

I'm currently assessing if that's intended behaviour (in which case the documentation should be amended) or a feature not working as it should (in which case it needs fixing). The parameter is indeed session-modifyable, but not in the sense you expected.

We'll keep you posted.

- Martin

Solomon Yakobson Jan 8 2025

Do you mean it must be enabled on system level and not on session level and all session can do is disabe it for the session?

SY.

MartinBach-Oracle Jan 14 2025

Yes,

that's correct as of Oracle Database Free 23.6.

- Martin

Solomon Yakobson Jan 14 2025

Thanks Martin, I hope this will be added to 23AI docs soon.

SY.

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Added on Feb 11 2025
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