An insert it takes sometimes 2 hours ends instead of 4 minutes

Dears

I have the following insert runing daily overnight batch in Production

INSERT / * + APPEND * / INTO my_table
(col_id, col1, dat_1, col2, col3, col4, dat_2, col5,
col6, col7,..., coln)
SELECT / * + index (dist_tab index_ni) * /.
(col_id, col1, dat_1, col2, col3, col4, dat_2, col5,
col6, col7,..., coln)
OF distant_table dist_tab
WHERE the dist_tab.dat_1 BETWEEN TRUNC(sysdate-6) AND TRUNC (sysdate + 1).
AND dist_tab.dat_2 BETWEEN TRUNC(sysdate-3)
AND TRUNC(sysdate-1) + (1-1/24/60/60)
AND NOT EXISTS (SELECT NULL
FROM my_table local_tab
WHERE local_tab.col1 = dist_tab.col_1
AND local_tab.dat_1 = dist_tab.dat_1
AND local_tab.col_2 = dist_tab.col_2);

Several months ago the inset above took more than 2 hours to complete. When I go back with the 10046 trace event and when I profiled this trace with RST$ generator xtat from Christian antognini profiles, I found that 94.295% of the response time is DB file sequential read.
The local table my_table is partitioned by dat_1. I'm in it insert the data from a remote table (more dblink) here named dist_tab.
the table my_table has a loca_index single index locally partitioned (col1, dat_1, col_2).

So I decided to

(a) alter table my_table parallel 4
(b) alter index loca_index parallel 4

This alter the insert began to fill in 4 minutes of time on average.

But, there is always a but. Sometimes (once or twice a month) this insert last more than 2 hours.

I printed here below the execution time of the last two days and the number of records inserted into my_table
start time end time nbr inserted records
2009-12-22 04:53:54 2009-12-22 04:59:40 115.350
2009-12-23 04:24:33 2009-12-23 06:04:43 119.365

Today, it took 2 hours to complete all yesterday and all the other days before it took about 4 minutes to insert almost the same number of records

The last time my_table was analyzed is 2009-12-17 13:28:5 and so it's to its index
Select last_analyzed
of all_ind_statistics
where index-name = "loca_index"; Returns the 17/12/2009 13:35:43

The last time the distant table was abalyzed 20/12/2009 01:58:09

Select last_analyzed all_tables where table_name = 'distant_table ';

So, where can I look for to understand this time not very often high insertion?

Thanks in advance

Tags: Database

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