Force CURSOR_SHARING and similar

Hi all
In the case of a session using mainly interview a PK of a table (different values each time),
are there disadvantages of using ALTER SESSION SET CURSOR_SHARING = FORCE?
And in the case of a session to help main query against a column with histogram (different values each time),
are there disadvantages of using ALTER SESSION SET CURSOR_SHARING = SIMILAR?
is it depends on the edition of oracle (9i / 10g..)?

As far as I understand, there is no, but I tend to hear a lot of DBA saying setting this parameter to something else that RIGHT will cause a lot of trouble.

I am currently working on 11 GR 2

Thank you! :)

Hello

There is nothing wrong on the use of FORCE or SIMILAR on a session-level (even better, on a level of education), if you know what you're doing.

On an instance level, nothing EXACT is likely to be a disaster. I understand the DBA feel to this topic very well... it is hard to feel otherwise
When you see something like this:

SELECT * (SELECT .... FROM ... ORDER BY :SYS_B0) WHERE ROWNUM=1

(seen on the realization of a large-scale application)

or something like this:

SELECT sql_id, count(*) num_versions
FROM v$sql
GROUP BY sql_id

sql_id num_versions
0q76895qvaz 56 053
9zfav935aafb 39 899
...

etc.

Best regards
Nikolai

Best regards
Nikolai

Tags: Database

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