	[x] Posted via EE Mobile
	Search, ask, and monitor your questions on the go with EE Mobile. Visit Experts Exchange from your mobile device and never be out of touch again.

Question

	[x] Attachment Details

[x]

The Solution Rating System

With so many solutions, how can you tell which solutions are most likely to help you and which ones are not? To provide you with a tool to use, we rate our solutions based on various elements that most accurately determine if a solution is a quality solution. To explain what factors affect the solution rating, here are the elements we take into consideration when formulating our solution rating.

The Grade of the Solution
The Zone Rank of the Expert Providing the Solution
The Number of Author and Expert Comments
The Number of Experts Contributing
The Feedback of the Community

Your Input Matters
Because of the way the system is set up, the most important variable in this equation is you. As a member of Experts Exchange, you are able to cast your vote on the quality of the solutions in regard to how complete, accurate, helpful and easy to understand each solution is. When you provide your feedback, each rating is adjusted accordingly. So, if you see a solution that has a poor rating that you think is a good solution, let us know by rating it. As you do, the rating will be adjusted and will become more accurate for other members of our site.

If you have any suggestions that you would like to make for our rating system, please ask a question in the Suggestions Zone of Community Support.

Thank you!

9.2

MySQL -> Reducing size of index to free up more RAM

Asked by t1shopper in PHP and Databases, MySQL Server

Tags: mysql, php

MySQL Administrator shows that my data length is 435 MB with an index length of 425MB in my two column table with 2,227,884 rows in it as you can see in the CREATE TABLE below. To free up more RAM, I'd like to reduce the size of the index. Using the approach below, I beleive I can change the index length from 425MB to 34MB.

1. Do a MD5 hash on the varchar(255) field which is 16 BINARY bytes long
2. Put the BINARY hash into a 3rd column with data type BINARY(16)
3. Remove the UNIQUE index from the varchar(255) and instead put it on the BINARY(16) field.

I get the 34MB index length number by doing:

(16 bytes * 2,227,884 rows) = 35,646,144 bytes = 33.9948 megabytes

Do you agree that this approach should work as planned?

Get your answer NOW

         
             CREATE TABLE  `server_logs`.`httpd_referer_mapping` (
  `hrmid` mediumint(8) unsigned NOT NULL auto_increment COMMENT 'INT allows for up to 4,294,967,295 unique referers.  4.2 billion.',
  `referer` varchar(255) NOT NULL,
  PRIMARY KEY  (`hrmid`),
  UNIQUE KEY `the_unique` USING BTREE (`referer`)
) ENGINE=InnoDB AUTO_INCREMENT=2190520 DEFAULT CHARSET=latin1;

20091111-EE-VQP-89 - Hierarchy / EE_QW_3_20080625

Hall of Fame

1. Ray_Pas...1,229,254
2. cxr811,332
3. angelIII359,843
4. NerdsOfT...288,539
5. hielo194,560
6. bportlock140,843
7. shobinsun139,297
8. gawai127,156
9. gamebits112,274
10. logudotcom104,037
11. wuff1uk102,884
12. routinet99,390
13. yodercm93,404
14. profya91,494
15. mwvisa188,012
16. RQuadling80,065
17. gr8gonzo79,888
18. jason117878,625
19. fibo76,650
20. adrian_b...76,317
21. racmail2...74,495
22. al3cs1274,074
23. Michael70169,941
24. leakim97169,221
25. ushastry65,890

1. Ray_Pas...1,655,256
2. hielo1,388,153
3. angelIII1,361,013
4. hernst421,083,141
5. cxr994,784
6. Roonaan690,452
7. ldbkutty688,003
8. RQuadling620,436
9. wasifg508,617
10. gamebits453,083
11. snoyes_jw431,105
12. routinet427,049
13. yodercm426,169
14. glcummins421,844
15. bportlock392,111
16. logudotcom342,507
17. NerdsOfT...329,284
18. i_m_aa...318,147
19. steelseth12306,629
20. TeRReF266,490
21. fibo262,259
22. nizsmo246,687
23. Diablo84239,472
24. dr_dedo218,197
25. nplib216,282

MySQL -> Reducing size of index to free up more RAM

Asked by t1shopper in PHP and Databases, MySQL Server

Tags: mysql, php

About this solution