PROBLEM WITH - AUTO_INCREMENT VALUE IN TABLE_SCHEMA NOT UPDATING - mysql

SCENARIO
ALTER TABLE {TABLE NAME} AUTO_INCREMENT = 1;
INSERT INTO {TABLE NAME} ({COLUMN}) VALUES (1);
(this is only record in table after auto increment was updated)
SELECT AUTO_INCREMENT FROM information_schema.TABLES
WHERE TABLE_SCHEMA = {DATABASE NAME}
AND TABLE_NAME = {TABLE NAME};
the last select auto_increment is returning the old value before execution alter table in step 1) and I don't understand why and hot to fix it or maybe alter table in step 1) is not correct way to reset auto_increment.
THX
PS. I know a bit but not everything. I was researching this problem and didn't find satisfactory/explanatory answer.


The INFORMATION_SCHEMA doesn't update to reflect recent alterations. MySQL 8.0 changed it so it only updates once every 24 hours.
You can set this:
SET GLOBAL information_schema_stats_expiry=0;
That will make INFORMATION_SCHEMA update immediately, at the cost of some overhead on your system.


I had the issue where the information schema wasn't being immediately updated.
To fix this I ran:
SET PERSIST information_schema_stats_expiry = 0;
As using SET GLOBAL didn't work for me.
Hope this helps somebody else.


I guess you must set AUTO_INCREMENT = 1 not 0

Related

MySQL read only transaction can modify table

I'm trying to use read only transaction in MySQL and I'm confused how it can modify (insert to table ) and can alter table column ( DDL and DML). example :
SET ##transaction_read_only=true;
start transaction ;
insert into Table_NAME (ID,name) values (3,'test');
ALTER TABLE Table_Name MODIFY COLUMN name VARCHAR (1000);
commit ;
can anybody explain what is wrong here ?
Update: I'm using datagrip and I found the issue is with DataGrip from mysql shell this doesn't work : insert into Table_NAME (ID,name) values (3,'test');
however this still work :
ALTER TABLE Table_Name MODIFY COLUMN name VARCHAR (1000);

ALTER TABLE will cause an implicit commit, so that that will be another transaction.
Don't put DDL in the transaction, it will make things complicated.
SET ##transaction_read_only=true; only works for the next transaction; while SET ##session.transaction_read_only = true is for the session.

MySql Query to Update Auto increment Primary Key [duplicate]

How can I reset the AUTO_INCREMENT of a field?
I want it to start counting from 1 again.

You can reset the counter with:
ALTER TABLE tablename AUTO_INCREMENT = 1
For InnoDB you cannot set the auto_increment value lower or equal to the highest current index. (quote from ViralPatel):
Note that you cannot reset the counter to a value less than or equal
to any that have already been used. For MyISAM, if the value is less
than or equal to the maximum value currently in the AUTO_INCREMENT
column, the value is reset to the current maximum plus one. For
InnoDB, if the value is less than the current maximum value in the
column, no error occurs and the current sequence value is not changed.
See How can I reset an MySQL AutoIncrement using a MAX value from another table? on how to dynamically get an acceptable value.

SET #num := 0;
UPDATE your_table SET id = #num := (#num+1);
ALTER TABLE your_table AUTO_INCREMENT =1;

Simply like this:
ALTER TABLE tablename AUTO_INCREMENT = value;
Reference: 13.1.9 ALTER TABLE Statement

There is a very easy way with phpMyAdmin under the "operations" tab. In the table options you can set autoincrement to the number you want.

The best solution that worked for me:
ALTER TABLE my_table MODIFY COLUMN ID INT(10) UNSIGNED;
COMMIT;
ALTER TABLE my_table MODIFY COLUMN ID INT(10) UNSIGNED AUTO_INCREMENT;
COMMIT;
It's fast, works with InnoDB, and I don't need to know the current maximum value!
This way. the auto increment counter will reset and it will start automatically from the maximum value exists.

The highest rated answers to this question all recommend "ALTER yourtable AUTO_INCREMENT= value". However, this only works when value in the alter is greater than the current max value of the autoincrement column. According to the MySQL 8 documentation:
You cannot reset the counter to a value less than or equal to the value that is currently in use. For both InnoDB and MyISAM, if the value is less than or equal to the maximum value currently in the AUTO_INCREMENT column, the value is reset to the current maximum AUTO_INCREMENT column value plus one.
In essence, you can only alter AUTO_INCREMENT to increase the value of the autoincrement column, not reset it to 1, as the OP asks in the second part of the question. For options that actually allow you set the AUTO_INCREMENT downward from its current max, take a look at Reorder / reset auto increment primary key.

As of MySQL 5.6 you can use the simple ALTER TABLE with InnoDB:
ALTER TABLE tablename AUTO_INCREMENT = 1;
The documentation are updated to reflect this:
13.1.7 ALTER TABLE Statement
My testing also shows that the table is not copied. The value is simply changed.

Beware! TRUNCATE TABLE your_table will delete everything in your your_table.
You can also use the syntax TRUNCATE table like this:
TRUNCATE TABLE table_name

ALTER TABLE news_feed DROP id
ALTER TABLE news_feed ADD id BIGINT( 200 ) NOT NULL AUTO_INCREMENT FIRST ,ADD PRIMARY KEY (id)
I used this in some of my scripts. The id field is dropped and then added back with previous settings. All the existent fields within the database table are filled in with the new auto increment values. This should also work with InnoDB.
Note that all the fields within the table will be recounted and will have other ids!!!.

It is for an empty table:
ALTER TABLE `table_name` AUTO_INCREMENT = 1;
If you have data, but you want to tidy up it, I recommend to use this:
ALTER TABLE `table_name` DROP `auto_colmn`;
ALTER TABLE `table_name` ADD `auto_colmn` INT( {many you want} ) NOT NULL AUTO_INCREMENT FIRST ,ADD PRIMARY KEY (`auto_colmn`);

To update to the latest plus one id:
ALTER TABLE table_name AUTO_INCREMENT =
(SELECT (id+1) id FROM table_name order by id desc limit 1);
Edit:
SET #latestId = SELECT MAX(id) FROM table_name;
SET #nextId = #latestId + 1;
ALTER TABLE table_name AUTO_INCREMENT = #nextId;
Not tested please test before you run*

Warning: If your column has constraints or is connected as a foreign key to other tables this will have bad effects.
First, drop the column:
ALTER TABLE tbl_name DROP COLUMN column_id
Next, recreate the column and set it as FIRST (if you want it as the first column I assume):
ALTER TABLE tbl_access ADD COLUMN `access_id` int(10) NOT NULL PRIMARY KEY AUTO_INCREMENT FIRST

As of MySQL 5.6 the approach below works faster due to online DDL (note algorithm=inplace):
alter table tablename auto_increment=1, algorithm=inplace;

SET #num := 0;
UPDATE your_table SET id = #num := (#num+1);
ALTER TABLE your_table AUTO_INCREMENT =1;

ALTER TABLE tablename AUTO_INCREMENT = 1

Try to run this query:
ALTER TABLE tablename AUTO_INCREMENT = value;
Or try this query for the reset auto increment
ALTER TABLE `tablename` CHANGE `id` `id` INT(10) UNSIGNED NOT NULL;
And set auto increment and then run this query:
ALTER TABLE `tablename` CHANGE `id` `id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT;

The auto-increment counter for a table can be (re)set in two ways:
By executing a query, like others already explained:
ALTER TABLE <table_name> AUTO_INCREMENT=<table_id>;
Using Workbench or another visual database design tool. I am going to show in Workbench how it is done - but it shouldn't be much different in other tools as well. By right clicking over the desired table and choosing Alter table from the context menu. On the bottom you can see all the available options for altering a table. Choose Options and you will get this form:
Then just set the desired value in the field Auto increment as shown in the image. This will basically execute the query shown in the first option.

If you're using PHPStorm's database tool you have to enter this in the database console:
ALTER TABLE <table_name> AUTO_INCREMENT = 0;

I tried to alter the table and set auto_increment to 1 but it did not work. I resolved to delete the column name I was incrementing, then create a new column with your preferred name and set that new column to increment from the onset.

I googled and found this question, but the answer I am really looking for fulfils two criteria:
using purely MySQL queries
reset an existing table auto-increment to max(id) + 1
Since I couldn't find exactly what I want here, I have cobbled the answer from various answers and sharing it here.
Few things to note:
the table in question is InnoDB
the table uses the field id with type as int as primary key
the only way to do this purely in MySQL is to use stored procedure
my images below are using SequelPro as the GUI. You should be able to adapt it based on your preferred MySQL editor
I have tested this on MySQL Ver 14.14 Distrib 5.5.61, for debian-linux-gnu
Step 1: Create Stored Procedure
create a stored procedure like this:
DELIMITER //
CREATE PROCEDURE reset_autoincrement(IN tablename varchar(200))
BEGIN
SET #get_next_inc = CONCAT('SELECT #next_inc := max(id) + 1 FROM ',tablename,';');
PREPARE stmt FROM #get_next_inc;
EXECUTE stmt;
SELECT #next_inc AS result;
DEALLOCATE PREPARE stmt;
set #alter_statement = concat('ALTER TABLE ', tablename, ' AUTO_INCREMENT = ', #next_inc, ';');
PREPARE stmt FROM #alter_statement;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
END //
DELIMITER ;
Then run it.
Before run, it looks like this when you look under Stored Procedures in your database.
When I run, I simply select the stored procedure and press Run Selection
Note: the delimiters part are crucial. Hence if you copy and paste from the top selected answers in this question, they tend not to work for this reason.
After I run, I should see the stored procedure
If you need to change the stored procedure, you need to delete the stored procedure, then select to run again.
Step 2: Call the stored procedure
This time you can simply use normal MySQL queries.
call reset_autoincrement('products');
Originally from my own SQL queries notes in https://simkimsia.com/reset-mysql-autoincrement-to-max-id-plus-1/ and adapted for Stack Overflow.

delete from url_rewrite where 1=1;
ALTER TABLE url_rewrite AUTO_INCREMENT = 1;
and then reindex

ALTER TABLE `table_name` DROP `id`;
ALTER TABLE `table_name` ADD `id` INT NOT NULL AUTO_INCREMENT FIRST, ADD PRIMARY KEY (`id`) ;
Shortly,First we deleted id column then added it with primary key id again...

The best way is remove the field with AI and add it again with AI. It works for all tables.

You need to follow the advice from Miles M's comment and here is some PHP code that fixes the range in MySQL. Also you need to open up the my.ini file (MySQL) and change max_execution_time=60 to max_execution_time=6000; for large databases.
Don’t use "ALTER TABLE tablename AUTO_INCREMENT = 1". It will delete everything in your database.
$con = mysqli_connect($dbhost, $dbuser, $dbpass, $database);
$res = mysqli_query($con, "select * FROM data WHERE id LIKE id ORDER BY id ASC");
$count = 0;
while ($row = mysqli_fetch_array($res)){
$count++;
mysqli_query($con, "UPDATE data SET id='".$count."' WHERE id='".$row['id']."'");
}
echo 'Done reseting id';
mysqli_close($con);

I suggest you to go to Query Browser and do the following:
Go to schemata and find the table you want to alter.
Right click and select copy create statement.
Open a result tab and paste the create statement their.
Go to the last line of the create statement and look for the Auto_Increment=N,
(Where N is a current number for auto_increment field.)
Replace N with 1.
Press Ctrl + Enter.
Auto_increment should reset to one once you enter a new row in the table.
I don't know what will happen if you try to add a row where an auto_increment field value already exist.

How to reset AUTO_INCREMENT in MySQL

How can I reset the AUTO_INCREMENT of a field?
I want it to start counting from 1 again.

You can reset the counter with:
ALTER TABLE tablename AUTO_INCREMENT = 1
For InnoDB you cannot set the auto_increment value lower or equal to the highest current index. (quote from ViralPatel):
Note that you cannot reset the counter to a value less than or equal
to any that have already been used. For MyISAM, if the value is less
than or equal to the maximum value currently in the AUTO_INCREMENT
column, the value is reset to the current maximum plus one. For
InnoDB, if the value is less than the current maximum value in the
column, no error occurs and the current sequence value is not changed.
See How can I reset an MySQL AutoIncrement using a MAX value from another table? on how to dynamically get an acceptable value.

SET #num := 0;
UPDATE your_table SET id = #num := (#num+1);
ALTER TABLE your_table AUTO_INCREMENT =1;

Simply like this:
ALTER TABLE tablename AUTO_INCREMENT = value;
Reference: 13.1.9 ALTER TABLE Statement

There is a very easy way with phpMyAdmin under the "operations" tab. In the table options you can set autoincrement to the number you want.

The best solution that worked for me:
ALTER TABLE my_table MODIFY COLUMN ID INT(10) UNSIGNED;
COMMIT;
ALTER TABLE my_table MODIFY COLUMN ID INT(10) UNSIGNED AUTO_INCREMENT;
COMMIT;
It's fast, works with InnoDB, and I don't need to know the current maximum value!
This way. the auto increment counter will reset and it will start automatically from the maximum value exists.

The highest rated answers to this question all recommend "ALTER yourtable AUTO_INCREMENT= value". However, this only works when value in the alter is greater than the current max value of the autoincrement column. According to the MySQL 8 documentation:
You cannot reset the counter to a value less than or equal to the value that is currently in use. For both InnoDB and MyISAM, if the value is less than or equal to the maximum value currently in the AUTO_INCREMENT column, the value is reset to the current maximum AUTO_INCREMENT column value plus one.
In essence, you can only alter AUTO_INCREMENT to increase the value of the autoincrement column, not reset it to 1, as the OP asks in the second part of the question. For options that actually allow you set the AUTO_INCREMENT downward from its current max, take a look at Reorder / reset auto increment primary key.

As of MySQL 5.6 you can use the simple ALTER TABLE with InnoDB:
ALTER TABLE tablename AUTO_INCREMENT = 1;
The documentation are updated to reflect this:
13.1.7 ALTER TABLE Statement
My testing also shows that the table is not copied. The value is simply changed.

Beware! TRUNCATE TABLE your_table will delete everything in your your_table.
You can also use the syntax TRUNCATE table like this:
TRUNCATE TABLE table_name

ALTER TABLE news_feed DROP id
ALTER TABLE news_feed ADD id BIGINT( 200 ) NOT NULL AUTO_INCREMENT FIRST ,ADD PRIMARY KEY (id)
I used this in some of my scripts. The id field is dropped and then added back with previous settings. All the existent fields within the database table are filled in with the new auto increment values. This should also work with InnoDB.
Note that all the fields within the table will be recounted and will have other ids!!!.

It is for an empty table:
ALTER TABLE `table_name` AUTO_INCREMENT = 1;
If you have data, but you want to tidy up it, I recommend to use this:
ALTER TABLE `table_name` DROP `auto_colmn`;
ALTER TABLE `table_name` ADD `auto_colmn` INT( {many you want} ) NOT NULL AUTO_INCREMENT FIRST ,ADD PRIMARY KEY (`auto_colmn`);

To update to the latest plus one id:
ALTER TABLE table_name AUTO_INCREMENT =
(SELECT (id+1) id FROM table_name order by id desc limit 1);
Edit:
SET #latestId = SELECT MAX(id) FROM table_name;
SET #nextId = #latestId + 1;
ALTER TABLE table_name AUTO_INCREMENT = #nextId;
Not tested please test before you run*

Warning: If your column has constraints or is connected as a foreign key to other tables this will have bad effects.
First, drop the column:
ALTER TABLE tbl_name DROP COLUMN column_id
Next, recreate the column and set it as FIRST (if you want it as the first column I assume):
ALTER TABLE tbl_access ADD COLUMN `access_id` int(10) NOT NULL PRIMARY KEY AUTO_INCREMENT FIRST

As of MySQL 5.6 the approach below works faster due to online DDL (note algorithm=inplace):
alter table tablename auto_increment=1, algorithm=inplace;

SET #num := 0;
UPDATE your_table SET id = #num := (#num+1);
ALTER TABLE your_table AUTO_INCREMENT =1;

ALTER TABLE tablename AUTO_INCREMENT = 1

Try to run this query:
ALTER TABLE tablename AUTO_INCREMENT = value;
Or try this query for the reset auto increment
ALTER TABLE `tablename` CHANGE `id` `id` INT(10) UNSIGNED NOT NULL;
And set auto increment and then run this query:
ALTER TABLE `tablename` CHANGE `id` `id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT;

The auto-increment counter for a table can be (re)set in two ways:
By executing a query, like others already explained:
ALTER TABLE <table_name> AUTO_INCREMENT=<table_id>;
Using Workbench or another visual database design tool. I am going to show in Workbench how it is done - but it shouldn't be much different in other tools as well. By right clicking over the desired table and choosing Alter table from the context menu. On the bottom you can see all the available options for altering a table. Choose Options and you will get this form:
Then just set the desired value in the field Auto increment as shown in the image. This will basically execute the query shown in the first option.

If you're using PHPStorm's database tool you have to enter this in the database console:
ALTER TABLE <table_name> AUTO_INCREMENT = 0;

I tried to alter the table and set auto_increment to 1 but it did not work. I resolved to delete the column name I was incrementing, then create a new column with your preferred name and set that new column to increment from the onset.

I googled and found this question, but the answer I am really looking for fulfils two criteria:
using purely MySQL queries
reset an existing table auto-increment to max(id) + 1
Since I couldn't find exactly what I want here, I have cobbled the answer from various answers and sharing it here.
Few things to note:
the table in question is InnoDB
the table uses the field id with type as int as primary key
the only way to do this purely in MySQL is to use stored procedure
my images below are using SequelPro as the GUI. You should be able to adapt it based on your preferred MySQL editor
I have tested this on MySQL Ver 14.14 Distrib 5.5.61, for debian-linux-gnu
Step 1: Create Stored Procedure
create a stored procedure like this:
DELIMITER //
CREATE PROCEDURE reset_autoincrement(IN tablename varchar(200))
BEGIN
SET #get_next_inc = CONCAT('SELECT #next_inc := max(id) + 1 FROM ',tablename,';');
PREPARE stmt FROM #get_next_inc;
EXECUTE stmt;
SELECT #next_inc AS result;
DEALLOCATE PREPARE stmt;
set #alter_statement = concat('ALTER TABLE ', tablename, ' AUTO_INCREMENT = ', #next_inc, ';');
PREPARE stmt FROM #alter_statement;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
END //
DELIMITER ;
Then run it.
Before run, it looks like this when you look under Stored Procedures in your database.
When I run, I simply select the stored procedure and press Run Selection
Note: the delimiters part are crucial. Hence if you copy and paste from the top selected answers in this question, they tend not to work for this reason.
After I run, I should see the stored procedure
If you need to change the stored procedure, you need to delete the stored procedure, then select to run again.
Step 2: Call the stored procedure
This time you can simply use normal MySQL queries.
call reset_autoincrement('products');
Originally from my own SQL queries notes in https://simkimsia.com/reset-mysql-autoincrement-to-max-id-plus-1/ and adapted for Stack Overflow.

delete from url_rewrite where 1=1;
ALTER TABLE url_rewrite AUTO_INCREMENT = 1;
and then reindex

ALTER TABLE `table_name` DROP `id`;
ALTER TABLE `table_name` ADD `id` INT NOT NULL AUTO_INCREMENT FIRST, ADD PRIMARY KEY (`id`) ;
Shortly,First we deleted id column then added it with primary key id again...

The best way is remove the field with AI and add it again with AI. It works for all tables.

You need to follow the advice from Miles M's comment and here is some PHP code that fixes the range in MySQL. Also you need to open up the my.ini file (MySQL) and change max_execution_time=60 to max_execution_time=6000; for large databases.
Don’t use "ALTER TABLE tablename AUTO_INCREMENT = 1". It will delete everything in your database.
$con = mysqli_connect($dbhost, $dbuser, $dbpass, $database);
$res = mysqli_query($con, "select * FROM data WHERE id LIKE id ORDER BY id ASC");
$count = 0;
while ($row = mysqli_fetch_array($res)){
$count++;
mysqli_query($con, "UPDATE data SET id='".$count."' WHERE id='".$row['id']."'");
}
echo 'Done reseting id';
mysqli_close($con);

I suggest you to go to Query Browser and do the following:
Go to schemata and find the table you want to alter.
Right click and select copy create statement.
Open a result tab and paste the create statement their.
Go to the last line of the create statement and look for the Auto_Increment=N,
(Where N is a current number for auto_increment field.)
Replace N with 1.
Press Ctrl + Enter.
Auto_increment should reset to one once you enter a new row in the table.
I don't know what will happen if you try to add a row where an auto_increment field value already exist.

How do I change the Auto Increment counter in MySQL?

I have an ID field that is my primary key and is just an int field.
I have less than 300 rows but now every time someone signs up that ID auto inc is inputted really high like 11800089, 11800090, etc.... Is there a way to get that to come back down so it can follow the order (310,311,312).
Thanks!

ALTER TABLE table_name AUTO_INCREMENT=310;
Beware though, you don't want to repeat an ID. If the numbers are that high, they got that way somehow. Be very sure you don't have associated data with the lower ID numbers.
https://dev.mysql.com/doc/refman/8.0/en/example-auto-increment.html

There may be a quicker way, but this is how I would do it to be sure I am recreating the IDs;
If you are using MySQL or some other SQL server, you will need to:
Backup your database
Drop the id column
Export the data
TRUNCATE or 'Empty' the table
Recreate the id column as auto_increment
Reimport the data
This will destroy the IDs of the existing rows, so if these are important, it is not a viable option.

The auto increment counter for a table can be (re)set two ways:
By executing a query, like others already explained:
ALTER TABLE <table_name> AUTO_INCREMENT=<table_id>;
Using Workbench or other visual database design tool. I am gonna show in Workbench how it is done - but it shouldn't be much different in other tool as well. By right click over the desired table and choosing Alter table from the context menu. On the bottom you can see all the available options for altering a table. Choose Options and you will get this form:
Then just set the desired value in the field Auto increment as shown in the image.
This will basically execute the query shown in the first option.

Guessing that you are using mysql because you are using PHP. You can reset the auto_increment with a statement like
alter table mytable autoincrement=301;
Be careful though - because things will break when the auto inc value overlaps

I believe that mysql does a select max on the id and puts the next. Try updating the ids of your table to the desired sequence. The problem you will have is if they're linked you should put a Cascade on the update on the fk.
A query that comes to my mind is:
UPDATE Table SET id=(SELECT max(id)+1 FROM TAble WHERE id<700)
700 something less than the 11800090 you have and near to the 300 WHERE id>0;
I believe that mysql complaints if you don't put a where

I was playing around on a similar problem and found this solution:
SET #newID=0;
UPDATE `test` SET ID=(#newID:=#newID+1) ORDER BY ID;
SET #c = (SELECT COUNT(ID) FROM `test`);
SET #s = CONCAT("ALTER TABLE `test` AUTO_INCREMENT = ",#c);
PREPARE stmt FROM #s;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
I hope that helps someone in a similar situation!

Incrementing in MySQL

I try to increment a field in mysql but it seems that it is not really working for some reasons ...
That is the query I run in mysql query:
UPDATE profil_perso
SET profile_views = profile_views +1
WHERE id = 30537
In the status bar it says : 1 row affected by the last command. No resultset returned. But it didn't seemed to work. At first I thougth that it was simply because there were no rows at all. So then I ran this query:
SELECT *
FROM profil_perso
WHERE id = 30537
And found 1 row and the profile_views field is still at 0...
Any ideas of why this would be that way ?
[edit]
profile_views = 1 (set manually) at this moment and it still doesn't work.

Didn't you forget to commit a transaction when working with an InnoDB table?
UPDATE:
Since it's a MyISAM, I'll ask yet a couple of stupid questions:
Are you absolutely sure you're issuing UPDATE and SELECT against one database?
I once had a large farm of databases with identical schemata, and this used to be a problem when someone deleted something from the wrong database.
Aren't you using some kind of client caching on your client? What client are you using?
And try to REPAIR your table, this also may be the issue.

Just to verify - is profile_views zero, or null? If you add 1 to null, you still get null, so that could be your problem.
ETA:
So it isn't null. Next question would be, do you have autocommit on or, if not, did you issue a "commit"? Could be that it was updated, but your update never committed.

If it's null, won't increment.
UPDATE profil_perso
SET profile_views = IF(profile_views,profile_views+1,1)
WHERE id = 30537

Add some parens and a coalesce to see if that fixes it:
UPDATE profil_perso
SET profile_views = ( COALESCE(profile_views,0) + 1 )
WHERE id = 30537