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histograms in dbms_stats.gather_table_stats [message #681677]

Fri, 14 August 2020 17:16

wtolentino
Messages: 422
Registered: March 2005

Senior Member

usually i use the default when i am using the dbms_stats.gather_table_stats package to collect the statistics.

for example:

 execute dbms_stats.gather_table_stats('HR','EMPLOYEE');

then i was been asked this question "does using a default on dbms_stats.gather_table_stats creates a histogram and if so how?".

how does dbms_stats.gather_table_stats creates a histogram?

thank you,
warren

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Re: histograms in dbms_stats.gather_table_stats [message #681678 is a reply to message #681677]

Fri, 14 August 2020 23:25

Michel Cadot
Messages: 68763
Registered: March 2007
Location: Saint-Maur, France, https...

Senior Member
Account Moderator

Quote:

does using a default on dbms_stats.gather_table_stats creates a histogram and if so how?".

It depends on your default gathering method (as you specified none):

SQL> select dbms_stats.get_param('METHOD_OPT') from dual;
DBMS_STATS.GET_PARAM('METHOD_OPT')
---------------------------------------------------------
FOR ALL COLUMNS SIZE AUTO

Quote:

how does dbms_stats.gather_table_stats creates a histogram?

Doc: https://docs.oracle.com/en/database/oracle/oracle-database/19/arpls/DBMS_STATS.html#GUID-CA6A56B9-0540-45E9-B1D7-D78769B7714C

[Updated on: Fri, 14 August 2020 23:25]

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