In the last episode (Oct 20), Bermejo, Rodrigo (GE Infra, Aviation) said:
> We are facing a preformance issue with a desktop application which
> connects remotly to a Mysql / DB ( ping times 300-800ms). We do not have
> time to invest in modifications to create a 2-tier ... Web application
> The initial plan was to implement a Client cache or a local DB (mysql
> slave or XML files).
>
> After reviwing the code and the sql logs I figured out there are a lot of
> insert/updates and replaces within loops. Sometimes there are more than
> 200 inserts statments coming for a loop.
>
> What I did was to create a long string with all statments separated with
> semicolons (batching) and then just send them all in just one statment.
> This reduced the major application use case time in 300%
A reasonable optimization. Note that you can insert multiple rows in one
INSERT statement: http://dev.mysql.com/doc/refman/5.1/en/insert.html
INSERT statements that use VALUES syntax can insert multiple rows. To do
this, include multiple lists of column values, each enclosed within
parentheses and separated by commas. Example:
INSERT INTO tbl_name (a,b,c) VALUES(1,2,3),(4,5,6),(7,8,9);
--
Dan Nelson
dnelson@stripped
