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dml is very slowly when table have many rows [message #521927]

Sun, 04 September 2011 20:14

andy huang
Messages: 498
Registered: July 2011

Senior Member

Dear all,
If a table(have a primary key) is empty(after truncate),the sql of dml(insert,update) is very quickly,but if the table have many rows about 10,000,000 rows, the dml is very slowly,why?

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Re: dml is very slowly when table have many rows [message #521928 is a reply to message #521927]

Sun, 04 September 2011 20:34

BlackSwan
Messages: 26766
Registered: January 2009
Location: SoCal

Senior Member

It would be helpful if you followed Posting Guidelines - http://www.orafaq.com/forum/t/88153/0/

post SQL_TRACE & EXPLAIN PLAN for both cases.

INSERT /*+ APPEND */ should maintain constant rate regardless of number of existing rows.

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Re: dml is very slowly when table have many rows [message #521930 is a reply to message #521927]

Sun, 04 September 2011 23:28

Michel Cadot
Messages: 68765
Registered: March 2007
Location: Saint-Maur, France, https...

Senior Member
Account Moderator

Quote:

why?

Why update 10,000,000 rows is slower then 0 row?

Regards
Michel

[Updated on: Sun, 04 September 2011 23:28]

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Re: dml is very slowly when table have many rows [message #521935 is a reply to message #521930]

Mon, 05 September 2011 01:58

andy huang
Messages: 498
Registered: July 2011

Senior Member

hi,
Just only insert, not update.

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Re: dml is very slowly when table have many rows [message #521939 is a reply to message #521935]

Mon, 05 September 2011 02:17

Michel Cadot
Messages: 68765
Registered: March 2007
Location: Saint-Maur, France, https...

Senior Member
Account Moderator

Quoting you: "the sql of dml(insert,update) [...] the dml is very slowly".
If you post a question that is not the one you want an answer there is few likelyhood you get an answer to the question you didn't post, isn't it?

Regards
Michel

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Re: dml is very slowly when table have many rows [message #521942 is a reply to message #521939]

Mon, 05 September 2011 02:34

andy huang
Messages: 498
Registered: July 2011

Senior Member

hi,
Sorry, I just test insert,not update. note the table is partitioned. when there no any row, it quickly,but when i have many rows about 10,000,000 rows, the insert is very.

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Re: dml is very slowly when table have many rows [message #521944 is a reply to message #521942]

Mon, 05 September 2011 02:45

Michel Cadot
Messages: 68765
Registered: March 2007
Location: Saint-Maur, France, https...

Senior Member
Account Moderator

You didn't post any information that allows us to diagnose.

Regards
Michel

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