Question

I have a large table in mysql, about 1 million records.

I’m using a dynamic query with different parameters in where clause and order, so i cant use some code like AND id > 34000 LIMIT 10

I have index on my fields in WHERE and LIMIT and ORDER but index doesn’t help alone.

I need a better way than LIMIT 34000, 10, Is there any way to slove offset delay?

I put my table schema but i just copy more usable field without any index, because i’m using dynamic queries.

CREATE TABLE IF NOT EXISTS `p_apartmentbuy` (
  `property_id` mediumint(8) unsigned NOT NULL,
  `dateadd` int(10) unsigned NOT NULL,
  `sqm` smallint(5) unsigned NOT NULL,
  `sqmland` smallint(5) unsigned NOT NULL,
  `age` tinyint(2) unsigned NOT NULL,
  `price` bigint(12) unsigned NOT NULL,
  `pricemeter` int(11) unsigned NOT NULL,
  `floortotal` tinyint(3) unsigned NOT NULL,
  `floorno` tinyint(3) unsigned NOT NULL,
  `unittotal` smallint(4) unsigned NOT NULL,
  `unitthisfloor` tinyint(3) unsigned NOT NULL,
  `room` tinyint(1) unsigned NOT NULL,
  `parking` tinyint(1) unsigned NOT NULL,
  `renovate` tinyint(1) unsigned NOT NULL,
  `address` varchar(255) COLLATE utf8_general_ci NOT NULL,
  `describe` varchar(500) COLLATE utf8_general_ci NOT NULL,
  `featured` tinyint(1) unsigned NOT NULL,
  `l_location_id` smallint(5) unsigned NOT NULL,
  `l_city_id` smallint(4) unsigned NOT NULL,
  `pf_furnished_id` tinyint(2) unsigned NOT NULL,
  PRIMARY KEY (`property_id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_general_ci;

Answer 1

the problem with a table with 1 mill records wont be the AND id > 34000 LIMIT 10 or LIMIT 34000, 10 that will up to the Structure and the rest of the query. I.E, you need index, PK, FK to speed up the query, beside that an Order by probably will slow it down, make search like '%text%' it will make your query SLOW. Also it’s up to the table’s Engine

So don’t expect that changing limit 10 will make a huge difference. There are a couple of tool that will help you to determinate a ‘better’ query, but not all queries works as the same so don’t expect the “best solution” because it doesn’t exists.

You can use Show create table or Describe select ...... or explain to see what’s going on, or use the command benchmark to see the approximate time of a function that you are applying to improve it

EDIT:

Some tools for MySQL
I’ll recommend you to take a look to this program that will help you with this part of performance.

• Mysqlslap (it’s like benchmark but you can customize more the result).
• SysBench (test CPUperformance, I/O performance, mutex contention, memory speed, database performance).
• Mysqltuner (with this you can analize general statistics, Storage engine Statistics, performance metrics).
• mk-query-profiler (perform analysis of a SQL Statement).
• mysqldumpslow (good to know witch queries are causing problems).