Mysql Error No 1071

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about specified key was too long max key length is 1000 bytes mysql hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask mysql innodb_large_prefix Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. mysql innodb increase max key length Join them; it only takes a minute: Sign up #1071 - Specified key was too long; max key length is 767 bytes up vote 194 down vote favorite 43 When I executed the following command: ALTER TABLE `mytable` ADD mysql max key length UNIQUE ( `column1` , `column2` ); I got this error message: #1071 - Specified key was too long; max key length is 767 bytes Information about column1 and column2: column1 varchar(20) utf8_general_ci column2 varchar(500) utf8_general_ci I think varchar(20) only requires 21 bytes while varchar(500) only requires 501 bytes. So the total bytes are 522, less than 767. So why did I get the error message? #1071 - Specified key was too long; max key length is 767 bytes mysql

Error 1709 (hy000): Index Column Size Too Large. The Maximum Column Size Is 767 Bytes.

byte varchar mysql-error-1071 share|improve this question edited May 23 '11 at 21:32 OMG Ponies 199k37360417 asked Nov 29 '09 at 3:18 Steven 5,2993480112 Because its not 520 bytes, but rather, 2080 bytes, which far exceeds 767 bytes, you could do column1 varchar(20) and column2 varchar(170). if you want a character/byte equiv, use latin1 –Rahly Dec 18 '15 at 0:21 add a comment| 17 Answers 17 active oldest votes up vote 137 down vote accepted 767 bytes is the stated prefix limitation for InnoDB tables - its 1,000 bytes long for MyISAM tables. According to the response to this issue, you can get the key to apply by specifying a subset of the column rather than the entire amount. IE: ALTER TABLE `mytable` ADD UNIQUE ( column1(15), column2(200) ); Tweak as you need to get the key to apply, but I wonder if it would be worth it to review your data model regarding this entity to see if there's improvements that would allow you to implement the intended business rules without hitting the MySQL limitation. share|improve this answer edited Oct 15 '14 at 20:20 The Alchemist 2,6901017 answered Nov 29 '09 at 3:52 OMG Ponies 199k37360417 To apply by specifying a subset of the column rather than the entire amount. A good solution. –Steven Nov 29 '09 at 4:14 @OMGPonies: Do you happen to know, if

18:54 Reporter: Bent Vangli Email Updates: Status: Not a Bug Impact on me: None Category:MySQL Server: MyISAM storage engine Severity:S2 (Serious) Version:4.1.7 OS:Linux (Linux (Fedora Core 2)) Assigned to: Matt Lord View Add Comment Files Developer Edit Submission

Django Specified Key Was Too Long; Max Key Length Is 767 Bytes

View Progress Log Contributions [13 Nov 2004 12:28] Bent Vangli Description: When I try to django.db.utils.operationalerror: (1071, 'specified key was too long; max key length is 767 bytes') execute the following SQL statement: CREATE TABLE phpgw_lang ( lang varchar(5) NOT NULL DEFAULT '', app_name varchar(100) NOT NULL DEFAULT 'common', message_id varchar(255) NOT mysql max key length is 3072 bytes NULL DEFAULT '', content text, PRIMARY KEY(lang,app_name,message_id) ); I got MySQL Error: 1071, Specified key was too long; max key length is 1000 bytes When I shorten message_id to varchar(228) it works. varchar(229) doesn't. I am using UTF8 http://stackoverflow.com/questions/1814532/1071-specified-key-was-too-long-max-key-length-is-767-bytes as default charset on my MySQL engine. I cannot see anything wrong with above statement. However, I probarly got this error because multibyte preferable UTF8 character set uses much more bytes than the number of characters. Looking at the numbers, you find (5 + 100 + 228) * 3 = 999, which is less than 1000. and contrary (5 + 100 + 229) * 3 = 1002. I looks like MySQL are using a factor of 3, https://bugs.mysql.com/bug.php?id=6604 maybe hardcoded? But in normal western languages this is normally much less than 3 times, maybe more like 1.2 - 1.5. I Had put this on Serious Severity because it disables the possibility to install eGroupWare from http://www.egroupware.org/ using MySQL 4.1.x. With very best regards Bent Vangli PS! I do compile and install from source. If guided to sourcefiles involved, I may do some testing. How to repeat: Run above statement on a MySQL 4.1.7 with UTF8 as default charset on a Fedora Core 2 (Linux kernel 2.6). Proberly also on other OS using UTF8. Suggested fix: Suggestion 1: Add a runtime or compiler variable/setting allowing to increase this 1000 bytes limit, or suggestion 2: Count characters only, and eventually discards bytes after 1000, or suggestion 3: Add a runtime or compiler option allowing for adjusting the expected characters/bytes factor for UTF8 multibyte. [14 Nov 2004 18:54] Matt Lord Hi, Thanks for your bug report! This is not a bug, it is a stated limitation. From the manual page: http://dev.mysql.com/doc/mysql/en/CREATE_INDEX.html "Prefixes can be up to 255 bytes long (or 1000 bytes for MyISAM and InnoDB tables as of MySQL 4.1.2). Note that prefix limits are measured in bytes, whereas the prefix length in CREATE INDEX statements is interpreted as number of characters. Take this into account when specifying a prefix length for a column that uses a multi-byte character s

log in tour help Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss http://dba.stackexchange.com/questions/76567/how-to-resolve-specified-key-was-too-long-max-key-length-is-767-bytes the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Database Administrators http://wiki.ispirer.com/sqlways/troubleshooting-guide/mysql/import/key-too-long Questions Tags Users Badges Unanswered Ask Question _ Database Administrators Stack Exchange is a question and answer site for database professionals who wish to improve their database skills and learn max key from others in the community. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top How to resolve: Specified key was too long; max key length is 767 bytes [duplicate] up vote 1 down vote favorite This max key length question already has an answer here: Specified key was too long; max key length is 1000 bytes in mysql 5.6 5 answers Our server is creating a lot of tables and one of them is the Lock_ table. We are using MySQL 5.5 on Percona. Also we are using utf8_general_ci and utf8. It throws the following error when creating the following index on Lock_ table: ERROR 1071 (42000): Specified key was too long; max key length is 767 bytes Here is the create-table query: create table Lock_ ( uuid_ VARCHAR(75) null, lockId LONG not null primary key, companyId LONG, userId LONG, userName VARCHAR(75) null, createDate DATE null, className VARCHAR(75) null, key_ VARCHAR(200) null, owner VARCHAR(255) null, inheritable BOOLEAN, expirationDate DATE null ); Index query: create unique index IX_DD635956 on Lock_ (className, key_, owner); This problem is happening on one of our prod servers (previously it was standalone mysql and then later moved to percona, but the problem was present in both the editions), but this is working fine on our dev environment. So is th

1071 (42000): Specified Key was too Long; Max Key Length is 767 Bytes Ispirer Home Page Ispirer SQLWays Product Page - Migration to MySQL Request SQLWays ERROR 1071 (42000): Specified Key was too Long; Max Key Length is 767 Bytes Symptoms During the import to MySQL, when you create a key for a InnoDB table, the “ERROR 1071 (42000)” error arises. For example, CREATE TABLE department ( id INT, name VARCHAR(1000) ); ALTER TABLE department ADD PRIMARY KEY (id, name); ERROR 1071 (42000) at line 8: Specified key was too long; max key length is 767 bytes Cause The maximum key length for the MySQL database for InnoDB Engine is 767 bytes. The key length includes the sum lengths of all the columns included in the key. Solutions There are several solutions for this issue: Changing the size of some columns. For example, if VARCHAR(300) is used to store last names, you can reduce its size to 100 with minimal risk of data loss. Specifying the partial column length for the character columns in the key. For example, for VARCHAR(1000) column, you can specify only 100 characters to be used in the key. ALTER TABLE department ADD PRIMARY KEY (id, name(100)); In this example only 100 bytes of the NAME column participate in the primary key. Using a different set of columns for the key. Ispirer Home Page Ispirer SQLWays Product Page - Migration to MySQL Request SQLWays sqlways/troubleshooting-guide/mysql/import/key-too-long.txt · Last modified: March 20, 2013, 04:14:08 AM (external edit) © 1999-2016, Ispirer Systems Ltd.All Rights Reserved. Privacy Statement