Mysql error 121

mysql error 121

Error 121 is a foreign key constraint issue. The first thing to check is that your foreign key definitions are ok (all the tables and field. When you are trying to reference a key on parent table which is not a candidate key (either a primary key or a unique key) you may get the. mysql error 121_mysql-sql error errno:121-爱代码爱编程 #1005 - Can't create table 'wew.users_companies' (errno: 121) (Details) 谁能告诉我.

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MySQL : sql error errno: 121

Re: ERROR 1005: Can't create table (errno: 121) Help

Posted by: Heikki Tuuri
Date: March 15, 2006 03:17PM


Hi!

errno 121 means a duplicate key error. Probably the table already exists in the InnoDB internal data dictionary, though the .frm file for the table has been deleted. This is the most common reason for getting errno 121 in table creation. Another possible reason is a name conflict in a foreign key constraint name. Constraint names must be unique in a database, like table names are.

What does InnoDB print in the .err log?

Best regards,

Heikki
Oracle Corp./Innobase Oy
InnoDB - transactions, row level locking, and foreign keys for MySQL

InnoDB Hot Backup - a hot backup tool for InnoDB which also backs up MyISAM tables
http://www.innodb.com/order.php


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Re: ERROR 1005: Can't create table (errno: 121) Help

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Heikki Tuuri

March 15, 2006 03:17PM



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Code 1478

MySQL errno: 121

MySQL errno: 121

MySQL error code 121: Duplicate key on write or update Sometimes can be a bit confusing how we might get a duplicate key error while creating a table.

I faced this error (errno 121) but it was caused by mysql-created intermediate tables that had been orphaned, preventing mysql error 121 from altering a table even though no such constraint name existed across any of my tables.

errno 121 means a duplicate key error. Probably the table already exists in the InnoDB internal data dictionary, though the.frm file for the table has been deleted. This is the most common reason for getting errno 121 in table creation. Another possible reason is a name conflict in a foreign key constraint name.

Error 1005 mysql

Solution for ERROR 1005 (HY000) Can't create table ' in MySQL If you are using referential integrity on MySQL, you can easily run into this error with the InnoDB engine. It frequently seems to occur with an ALTER TABLE statement.

If MySQL reports an error number 1005 from a CREATE TABLE statement, and the error message refers to error 150, table creation failed because a foreign key constraint was not correctly formed. Similarly, if an ALTER TABLE fails and it refers to error 150, that means a foreign key definition would be incorrectly formed for the altered table.

Sorry, you can't reply to this topic, mysql error 121. It has been closed. Content reproduced on this site is the property of the respective copyright holders.

Error Code: 1005 can t create table (errno: 150)

Error Code: 1005 -- there is a wrong primary key reference in your code Usually it's due to a referenced foreign key field that does not exist. It might be you have a typo mistake, or check case it should be same, or there's a field-type mismatch. Foreign key-linked fields must match definitions exactly.

If these are not satisfied, MySQL returns Error 1005 and refers to Error 150 in the error message, which means that a foreign key constraint was not correctly formed. Similarly, if an ALTER TABLE fails due to Mysql error 121 150, this means that a foreign key definition would be incorrectly formed for the altered table.

If these are not satisfied, MySQL returns error number 1005 and refers to error 150 in the error message. A few ideas: Better drop the tables and create it new with a well formed syntax, mysql error 121. Make sure to add ENGINE=InnoDB; to your CREATE TABLE - command. Make sure InnoDB is enabled on your MySQL server.

Error Code: 3780 MySQL

MySQL Bugs: #101330: On adding Foreign key gives error 3780. Bug #101330. On adding Foreign key gives error 3780. Submitted: 27 Oct 2020 4:15. Modified: 27 Oct 2020 6:36. Reporter: Abhijeet Singh.

Added new, more specific error code and message which are used in cases when foreign key can't be created due to column types mismatch. === The new mysql error 121 message which above test case emits now is: ERROR 3780 (HY000): Referencing column 'num' and referenced column 'num' in foreign key constraint 't2_ibfk_1' are incompatible.

Error code 3780 mysql MySQL cannot create foreign key constraint, This error can also occur, if the references table and the current table don't have the same character set, mysql error 121. Error Code: 3780. Referencing column 'personOne' and referenced column 'person' in foreign key constraint mysql error 121 are incompatible.

6) The foreign key is a multi-column PK or UK, where the referenced column is not the leftmost one. How to diagnose: Do a SHOW CREATE TABLE parent to check if the REFERENCES part points to a column that is present in some multi-column index(es) but is not the leftmost one in its definition.

Sql error 1005

ERROR 1005 (HY000): Can't create table './mndb/#sql-992_406.frm' (errno: 150) How to repeat: create table foo (id integer) ; create table bar (id integer) ; alter table foo add foreign key (id) references bar (id) ; returns: ERROR 1005 (HY000): Can't create table './mndb/#sql-992_406.frm' (errno: 150) It appears that MySQL is generating a temporary table with '#' in it.

According to your SQL Server error log, the issue could be due to the failure of registering a Service Principal Name (SPN) for the SQL Server service. SQL Server always attempts to create an SPN for the instance upon startup. Unless the service account mysql error 121 specifically given the Read and Write ServicePrincipalName permissions, this will fail.

MariaDB error 1005

ERROR 1005 (HY000): Can't create table 'sphinx' (errno: 6 "No such device or address") when trying to create Sphinx proxy table. Any idea where is the problem? Using MariaDB 10.1.21 and Sphinx 2.2.11.

ERROR 1005 (HY000): Can't create table 'my_data' (errno: 150) You can try SHOW WARNINGS but you will discover more about the error by running the following command as the root superuser: Copy to clipboard. mysql> SHOW engine innodb STATUS; It returns a dump of the InnoDB's activity.

SET SESSION innodb_strict_mode = ON; CREATE OR REPLACE TEMPORARY TABLE tab ( id int PRIMARY KEY, str varchar (50) ) DATA DIRECTORY = '/mariadb'; ERROR 1005 (HY000): Can 't create table `db1`.`tab` (errno: 140 "Wrong create options") SHOW WARNINGS; +-----+-----+-----+

[Solved-4 Solutions] error 1005 Can't create table (errno 121)

Error Description:

Error 1005 Can't create table (errno 121)

Solution 1:

We will get this message if we're trying to add a constraint with a name that's already used somewhere else

To check constraints use the following SQL query:

click below button to copy the code. By - mysql tutorial - team

Solution 2:

Foreign Key Constraint Names Have to be Unique Within a Database

  • If the table we're trying to create includes a foreign key constraint, and we've provided our own name for that constraint, remember that it must be unique within the database.
  • We wasn’t mysql error 121 of that. we have changed foreign key constraint names according to the following schema which appears to be used by Ruby on Rails applications, too:
click below button to copy the code. By - mysql tutorial - team

Solution 3:

There is no need to name our constraints, but if we do, mysql error 121, then that is the name that must be unique within each schema. The error is telling us that we already have constraints with the same name elsewhere.

To see where, We can Show Engine Innodb Status;

click below button to copy the code. By - mysql tutorial - team

But in mysql error 121 case, we don't need to look that up, mysql error 121, since it's apparent from the script that we are reusing the same constraint names in multiple syntax error, unexpected t_else in denwer definitions.

click below button to copy the code. By - mysql tutorial - team

We should not have a problem. we will find that InnoDB will generate names for our constraints, like PAESE_ibfk_1, PAESE_ibfk_2, mysql error 121, etc.

  • we can continue to declare the names of our constraints, remembering that whatever comes after the keyword CONSTRAINT has to be unique within each schema.
  • "If the CONSTRAINT symbol clause is given, the symbol value must be unique in the database. If the clause is not given, InnoDB creates the name automatically."

Solution 4:

  • We faced this error (errno 121) but it was caused by mysql-created intermediate tables that had been orphaned, preventing me from altering a table even though no such constraint name existed across any of my tables.
  • At some point, my MySQL had crashed or failed to cleanup an intermediate table (table name starting with a #sql-) which ended up presenting me with an error such as: Can't create table '#sql-' (errno 121) when trying to run an ALTER TABLE with certain constraint names.
click below button to copy the code. By - mysql tutorial - team
click below button to copy the code. By - mysql tutorial - team

After discovering the filename, such as #sql-9ad_15.frm, we was able to drop that orphaned table in MySQL:

click below button to copy the code. By - mysql tutorial - team

After doing so, mysql error 121, we was then able to successfully run my ALTER TABLE.

When I try to run the query in phpMyAdmin I get the following error:

Error SQL query:

ALTER TABLE common_publication_descriptions ADD CONSTRAINT FK_id_commun_publication_comun FOREIGN KEY mysql error 121 REFERENCES publications_commons (id) MySQL said: Documentation

1005 - Cannot create table . (Error: 121 "Duplicate key on write or update") (Detalles…)

Here is the script of my query:

Asked el 28 de October, 2019 by Leonidas

Answers

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You had duplicated the name of the restriction that is, after . It is a name that must be declared but you do not use it, mysql does. Notice that I put a number to each one. And I also commented the look:

Answered el 28 de October, mysql error 121, 2019 by Juan Rom(1 Points )

the problems you have are 2, but they are practically the same:

You have those repeated names. just change the names of the constraints and it will work without problems.

for example:

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