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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Slow Inserts
Mike,
First of all, I don't think 6 million rows an hour is bad. But I think that the way the thing is written slows the process down. The way I look at it, your are performing 6 million individual insert statements. rather than one insert into...select from statement. Your way is much slower than the other way.
I would try and find a way to combine all of the inerts/selects you are doing into one statement. I tried, but can't make sense out of what the query is doing. This is what it looks like it's doing to me. Note that this is a big assumption on my part as I don't know what the Load_Acct_Subset_Table procedure is doing. Ther query below also seems to be mssing any type of 'where' clause for the V_LDGR_ACCT_HIER VLGR view.
Insert Into T_RPT_ACCT_SUBSET_TEMP (acct_subset_cd, acct_nbr) Select TRPT.acct_subset_cd, VLGR.Acct
From V_LDGR_ACCT_HIER VLGR, T_RPT_ACCT_SUBSET TRPT Where TRPT.node_lvl_nbr = TRPT.node_nm and TRPT.node_lvl_nbr is null;
Good Luck!
Tom Mercadante
Oracle Certified Professional
-----Original Message-----
From: Jared.Still_at_radisys.com [mailto:Jared.Still_at_radisys.com]
Sent: Friday, March 19, 2004 1:12 PM
To: oracle-l_at_freelists.org
Subject: Re: Slow Inserts
In addition to Mark's comments, I am wondering about a couple of things.
The first is almost trivial, but not quite.
The record v_rpt_acct_subset_record is based on the table t_rpt_acct_subset.
It would be better practice to base it on the cursor c_rpt_acct_subset. One
less thing
to worry about should you change the cursor definition in the future.
The other concerns the SQL string. The code for the procedure
Load_Acct_Subset_Table is
not visible, so it's kind of hard to comment on.
Try using bind variables with 'execute immediate .. using ... '
HTH Jared
mkline1_at_comcast.net
Sent by: oracle-l-bounce_at_freelists.org
03/19/2004 08:40 AM
Please respond to oracle-l
To: oracle-l_at_freelists.org
cc:
Subject: Slow Inserts
Client has what appears to be a VERY simple insert program, but this is taking forever.
Are there any "basic" things that might help with speed?
This takes about 7 hours and does 6,000,000 rows per hours.
This is HP-UX and 8.1.7.3.4... Seems pretty fast, but they'd like to get it up a bit. It's been so long for me though being the Production DBA side most of the time. Arraysize? buffers?
This is about an 600-800gb database.
Declare
v_insert_clause varchar2(500); v_set_clause varchar2(500); v_select_from_clause varchar2(500); v_where_clause varchar2(500); v_sql_string varchar2(900);
Cursor c_rpt_acct_subset IS
Select *
From T_RPT_ACCT_SUBSET
Where node_lvl_nbr is not null;
v_rpt_acct_subset_record t_rpt_acct_subset%ROWTYPE;
Begin
Open c_rpt_acct_subset;
LOOP Fetch c_rpt_acct_subset INTO v_rpt_acct_subset_record;
EXIT WHEN c_rpt_acct_subset%NOTFOUND;
v_insert_clause := 'Insert Into T_RPT_ACCT_SUBSET_TEMP
(acct_subset_cd, acct_nbr)';
v_select_from_clause := ' Select
'''||v_rpt_acct_subset_record.acct_subset_cd||''', Acct
From V_LDGR_ACCT_HIER ';
v_where_clause := 'Where '||v_rpt_acct_subset_record.node_lvl_nbr|| ' = '''|| v_rpt_acct_subset_record.node_nm|| '''';
v_sql_string := v_insert_clause || v_select_from_clause || v_where_clause;
Load_Acct_Subset_Table(v_sql_string);
END LOOP; Close c_rpt_acct_subset;
Insert Into t_rpt_acct_subset_temp
(acct_subset_cd,
acct_nbr)
Select acct_subset_cd,
node_nm
From T_RPT_ACCT_SUBSET
Where node_lvl_nbr is null;
END;
/
--
Michael Kline, Principle Consultant
Business To Business Solutions
13308 Thornridge Ct
Midlothian, VA 23112
804-744-1545
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