1069 Error Mysql
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CI MySQL Sandbox MariaDB data chef Adtech Twitter GitHub RSS Avoiding MySQL ERROR 1069 by Explicitly Naming Indexes Since I recently wrote about both MySQL error 1071 and
1069 Too Many Keys Specified
error 1070 I decided to continue the pattern with a quick too many keys specified; max 0 keys allowed note on MySQL error 1069. In case you've never seen it before, this is MySQL error 1069: 1 ERROR 1069 (42000): Too many keys specified; max 64 keys allowed I can't think of a valid use case that requires more than 64 indexes on a MySQL table, but it's possible to get this error by inadvertantly adding lots of duplicate indexes to a table. This can happen if you don't explicitly name your indexes. Read on for examples… If I try to add the same named index twice, the second time it fails, so I do not end up with a duplicate index: 1 2 3 4 5 6 mysql> alter table sakila.film add index release_year (release_year); Query OK, 0 rows affected (0.03 sec) Records: 0 Duplicates: 0 Warnings: 0 mysql> alter table sakila.film add index release_year (release_year); ERROR 1061 (42000): Duplicate key name 'release_year' If I do the same thing without naming the index, then a duplicate index is created and I get a warning, not an error: 1 2 3 4 5 6 7 8 9 mysql> alter table sakila.film add index (release_year); Query OK, 0 rows affected (0.04 sec) Records: 0 Duplicates: 0 Warnings: 0 mysql> alter table sakila.film add index (release_year); Query OK, 0 rows affected, 1 warning (0.03 sec) Records: 0 Duplicates: 0 Warnings: 1 Note (Code 1831): Duplicate index 'release_year_2' defined on the table 'sakila.film'. This is deprecated and will be disallowed in a future release. Now imagine an automated script that tri
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reddy Email Updates: Status: Not a Bug Impact on me: None Category:MySQL Server: InnoDB storage engine Severity:S1 (Critical) Version:5.0,5.5 OS:Any Assigned to: View Add Comment Files Developer Edit https://bugs.mysql.com/bug.php?id=51450 Submission View Progress Log Contributions [24 Feb 2010 9:11] krishna reddy Description: I https://www.safaribooksonline.com/blog/2012/11/06/avoiding-too-many-keys-in-mysql/ am getting the error 1069:Too many keys specified. Max 64 keys allowed while creating the table with more than 64 foreign keys in My SQL 5.0 and later versions also like(My SQL 5.5). one of my table having 100 foreign keys.Data base engine is InnoDB. How to repeat: creating the table with too many more than 64 columns with 64 foreign keys. [24 Feb 2010 9:15] krishna reddy sql file consists the statements to test this bugAttachment: test_index_limit.sql (application/octet-stream, text), 5.02 KiB.
[24 Feb 2010 17:39] Miguel Solorzano Thank you the bug report. That's by design: http://dev.mysql.com/doc/refman/5.0/en/features.html "Support for up to 64 indexes per table (32 before MySQL 4.1.2). Each index may consist of 1 to 16 columns or parts too many keys of columns. The maximum index width is 1000 bytes (767 for InnoDB); before MySQL 4.1.2, the limit is 500 bytes...." Microsoft Windows [Version 6.0.6002] Copyright (c) 2006 Microsoft Corporation. All rights reserved. C:\build>type 5.0\include\config-win.h | findstr MAX_INDEXES #ifndef MAX_INDEXES #define MAX_INDEXES 64 C:\build> [25 Feb 2010 6:03] krishna reddy Hi, I am getting the error while adding the foreign key constraints to the table columns.Here One of my table of DB Engine type InnoDB having more than 64 foreign keys. Error is Too Many Keys specified:max 64 keys allowed. [25 Feb 2010 6:04] krishna reddy sql file consists the statements to test this bug.Attachment: test_foreign_key_limit.sql (application/octet-stream, text), 11.35 KiB. [3 Mar 2010 12:26] krishna reddy Hi, I am getting the error while adding the foreign key constraints to the table columns.Here One of my table of DB Engine type InnoDB having more than 64 foreign keys. Error is Too Many Keys specified:max 64 keys allowed. [4 Mar 2010 4:49] krishna reddy Hi, what will be the maximum limit for foreign keys to be created for a table? [17 Mar 2010 10:17] krishna reddy Hi, what will be the maximum limit for foreign keys to be ca relatively new server. Unfortunately I was greeted with this: django.db.utils.DatabaseError: (1069, 'Too many keys specified; max 64 keys allowed') 1 django.db.utils.DatabaseError: (1069, 'Too many keys specified; max 64 keys allowed') What does that mean? First, we have to figure out what a key is. Stackoverflow is helpful for this sort of thing: http://stackoverflow.com/questions/924265/what-does-the-key-keyword-mean. So a key is an index. Great. We definitely have a lot of Foreign Keys and each table has a Primary Key, but we certainly don't have 64 Foreign Keys + Primary Keys. Now that we know that a key is really an index, how do we see what indices exist? Luckily the stack trace that produced the error above at least had a table it seemed to be having trouble with (table: penguin). Running this command shows us the indices: mysql> show index in penguin; +---------+----------+-------------+ | Table | Key_name | Column_name | +---------+----------+-------------+ | penguin | PRIMARY | id | | penguin | username | username | | penguin | email | email | | penguin | email_4 | email | | penguin | email_2 | email | | penguin | email_3 | email | | penguin | email_5 | email | | penguin | email_6 | email | | penguin | email_7 | email | ... | penguin | email_62 | email | +---------+----------+-------------+ 64 rows in set (0.00 sec) 1234567891011121314151617 mysql> show index in penguin;+---------+----------+-------------+| Table | Key_name | Column_name |+---------+----------+-------------+| penguin | PRIMARY| id|| penguin | username | username|| penguin | email| email || penguin | email_4| email || penguin | email_2| email || penguin | email_3| email || penguin | email_5| email || penguin | email_6| email || penguin | email_7| email |...| penguin | email_62 | email |+---------+----------+-------------+64 rows in set (0.00 sec) Ah ha! There are the the 64 keys but why in the world are there 62 email indices? What could be adding an index to the email column during a deploy? Well, the traceback said that it failed during a run of Django's syncdb, which creates new database tables to align with a model. A little code snooping (thank you git grep) yielded a piece of our code that hooked into the django post_syncdb signal. This was the offending code: def update_email_field(sender, **kwargs): from django.db import connection, transaction cursor = connection.cursor() cursor.execute("ALTER TABLE penguin MODIFY email VARCHAR(255) NOT NULL UNIQUE") transaction.commit_unless_managed() post_syncdb.connect(update_email_field) 1234567 def update_email_field(sender,