This page (Section 5.2.9: Speed of INSERT Queries) might be of interest:
http://www.mysql.com/doc/en/Insert_speed.html
You might also want to investigate the INSERT IGNORE command (IGNORE
means ignore all inserts with duplicate unique keys), for example:
INSERT IGNORE
INTO your_table
(col1,col2,col3)
VALUES
(vala1,vala2,vala3),
(valb1,valb2,valb3),
(valc1,valc2,valc3)
See
http://www.mysql.com/doc/en/INSERT.html
for more info.
-steve
At 9:15 AM +0200 1/20/03, Zysman, Roiy wrote:
>Hi All,
>I'm trying to insert multiple lines to a table with 3 col. All 3 of them
>are a part of the primary key.
>But while inserting the data , sometime occurs the situation where I
>want to insert an already exist entry with the same keys. And mysql
>barfs out that this key already exist in the table.
>The solution to it would be probably to query for each entry that I'm
>about to insert if that entry exists , but it looks like it would be an
>enormous overhead. I'm asking this question on a _performance_ context .
>What is the best way , ignore the error messages mysql barfs out or
>query each entry for existences before inserting it ?
>
>Roiy
>
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| Steve Edberg sbedberg@stripped |
| University of California, Davis (530)754-9127 |
| Programming/Database/SysAdmin http://pgfsun.ucdavis.edu/ |
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