php/mysql index issue

joey3002

I have a script that I am trying to speed up. Its written in php and uses mysql.

With the following statement, where should indexes be or how can this statement be optimized? It is taking a good 15 seconds to display this.. (50 items)

SELECT n_date, n_title, news, short_text, n_id, global_ngid, catagory_id , nfo FROM news WHERE catagory_id IN (5,6,47,50) and ( (catagory_id = 5) or (catagory_id = 6) or (catagory_id = 47) or (catagory_id = 50) ) AND ngid = global_ngid AND valid = 0 ORDER BY n_id DESC LIMIT 0,50

thanks

dagon

index catagory_id, ngid, valid and n_id

15 sec is a huige amountof time, are you sure thats just the db?

joey3002

what else could it be?

Here is what I see now with the changes:
Page generated in 16.59341 secs

If I choose another category from the webpage.. meaning I am changing:
IN (5,6,47,50) and ( (catagory_id = 5) or (catagory_id = 6) or (catagory_id = 47) or (catagory_id = 50) )

The speed is under 1 sec. There are alot of items in the categories above.. But the entire table is 68 megs.

What else can I do to get you guys more info to help? Do you need to see my mysql.conf file?

joey3002

here is my my.cnf file...

[mysqld]
max_connections = 500
max_allowed_packet = 16777216
max_heap_table_size = 1073741824
key_buffer = 150M
myisam_sort_buffer_size = 64M
join_buffer_size = 1M
read_buffer_size = 1M
sort_buffer_size = 1M
table_cache = 2000
thread_cache_size = 1500
wait_timeout = 14400
max_allowed_packet = 16M
max_connect_errors = 10
query_cache_limit = 1M
query_cache_size = 32M
query_cache_type = 1

#added this one to point mysql databases to the other drive
datadir=/var/lib/mysql
old-passwords = 1

[mysqld_safe]
open_files_limit = 8192
err-log=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

[mysqldump]
quick
max_allowed_packet = 16M

[myisamchk]
key_buffer = 64M
sort_buffer = 64M
read_buffer = 16M
write_buffer = 16M

[mysql.server]
user=mysql
basedir=/var/lib/mysql