Details. An INT is 4 bytes, and holds values up to 2^31-1 (or 2^32-1 for UNSIGNED INT). If you specify ON DUPLICATE KEY UPDATE, and a row is inserted that would cause a duplicate value in a UNIQUE index or PRIMARY KEY, MySQL performs an UPDATE of the old row. Since ids are not visible outside the transaction until the COMMIT, other queries can see id=7 before id=6 is visible. When i update a record with. Stack Overflow for Teams is a private, secure spot for you and
INSERT IGNORE, REPLACE, IODKU (that you are using), and some other commands will first allocate new id(s), then either use them or 'burn' them. Isn't key 1 id in this case and having it on auto_increment sufficient for being able to not specify it? Showed me I'd zapped the auto_increment with an update. In MySQL 8.0, the current maximum auto-increment value is persisted, preventing the reuse of previously allocated values. > The duplicate key entry happens when you reach the upper limit of the auto increment field I'm using a table that I update once a month, deleting all existing rows. ON DUPLICATE KEY+AUTO INCREMENT issue mysql (2) ... Next I did the "ON DUPLICATE KEY UPDATE" version of that sql statement, now this breaks the auto_increment value, but all the updates and inserts we've put in are all perfect auto_incrememnt values. Seems like mysql had the row count wrong, and the issue went away. That is, you can't set it to 1 or anything else less than MAX(id)+1. With an auto-increment column, an INSERT statement increases the auto-increment value but UPDATE … V-brake pads make contact but don't apply pressure to wheel. I take from your comments that you may be concerned about running out of integers if you don't fill every gap in an auto-increment primary key. your coworkers to find and share information. Storing JSON in database vs. having a new column for each key. The following demonstrates such. Thanks. Asking for help, clarification, or responding to other answers. INSERT INTO t1 (a,b,c) VALUES (1,2,3) ON DUPLICATE KEY UPDATE c=c+1; UPDATE t1 SET c=c+1 WHERE a=1; (The effects are not identical for an InnoDB table where a is an auto-increment column. Setup for examples to follow: site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. ...with 13 and 27 being valid id-s for existing pricing and apartment rows, and the table is defined as: Isn't key 1 id in this case and having it on auto_increment sufficient for being able to not specify it? Can you expand a bit about what table engine, key type, indexes were you using? It was Tinyint, and MySql want to write a 128th line. The "normal" usage of IODKU is to trigger "duplicate key" based on some UNIQUE key, not the AUTO_INCREMENT PRIMARY KEY. So slave then generates a new value based on its auto_inc counter, differing from master's. Step 2 - Align the AUTO_INCREMENT counter on table. I'm using an older version of mysql in a dev environment, so I don't assume the engine to work flawless. Mixed-mode inserts are basically ones where the maximum number of required AUTO_INCREMENT values is known, but the amount that will actually be needed is not. Thanks for contributing an answer to Stack Overflow! @TimBiegeleisen - I will dispute the "ever increasing", especially when viewed from a Slave. This can lead to lots of gaps. As I wrote before, we can do two queries. A word or phrase for people who eat together and share the same food. I understand, but why does the approach work then? Why not a normal index? XML Word Printable. Can anyone identify this biplane from a TV show? Is this house-rule that has each monster/NPC roll initiative separately (even when there are multiple creatures of the same kind) game-breaking? ON DUPLICATE KEY UPDATE is described as a "mixed-mode insert" for the purposes of InnoDB's AUTO_INCREMENT handling. i.e with the following table: create table `t1` ( `c1` int auto_increment, `c2` int unsigned not null, `c3` varchar(100) not null, counter int not null default 1, primary key (c1), unique key (`c2`, `c3`) ) engine = innodb If we use c2 and c3 within the ON DUPLICATE KEY UPDATE clause, we still get duplicate key errors - when we should not. But with a loss of performance and concurrency. What does 'levitical' mean in this context? ; Description: When inserting multiple rows on a table which has a UNIQUE constraint defined, a column which is an AUTO_INCREMENT value, and using the ON DUPLICATE KEY UPDATE clause, if an insert is converted in update due to the violation of a unique constraint, the … By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. The ON DUPLICATE KEY UPDATE clause can contain multiple column assignments, separated by commas. What procedures are in place to stop a U.S. Vice President from ignoring electors? So when we load the page we want to insert row into table if it's not exists. Periodically, the Auto_increment primary key reaches its limit so I reset it. ON DUPLICATE KEY UPDATE, which in the worst case is in effect an INSERT followed by a UPDATE, where the allocated value for the AUTO_INCREMENT column may or may not be used during the update phase. What does 'levitical' mean in this context? I had the same problem and here is my solution : My ID column had a bad parameter. share | improve this answer | follow | … Making statements based on opinion; back them up with references or personal experience. ... Interestingly enough, with non-traditional, it still increments for me using INSERT..ON DUPLICATE KEY UPDATE for MySQL 5.5.41 – Rogue Apr 4 '15 at 22:06. Thanks for contributing an answer to Stack Overflow! Making statements based on opinion; back them up with references or personal experience. ON DUPLICATE KEY UPDATE and AUTO_INCREMENT columns: View as plain text : ... (0.00 sec) I expected that the last INSERT clause would set the LAST_INSERT_ID() to 1. As for why the AUTO_INCREMENT has got out of whack I don't know. SQL statement. Can someone explain me WTF was MySQL doing to produce this weird behavior? With an auto-increment column, an INSERT statement increases the auto-increment value but UPDATE does not.) When the ON DUPLICATE KEY UPDATE option is defined in the INSERT statement, the existing rows are updated with the new values instead. ON DUPLICATE KEY UPDATE and AUTO_INCREMENT columns (too old to reply) Sven Paulus 2005-05-19 14:08:16 UTC. Is there *any* benefit, reward, easter egg, achievement, etc. Note 2: OK, this is a complete "twilight zone" moment: so after running the query above with the huge number for id, things started working normally, no more duplicate entry errors. After Mar-Vell was murdered, how come the Tesseract got transported back to her secret laboratory? Slow cooling of 40% Sn alloy from 800°C to 600°C: L → L and γ → L, γ, and ε → L and ε. Late to the party, but I just ran into this tonight - duplicate key '472817' and the provided answers didn't help. to get back the value of the AUTO_INCREMENT column. If the string already exists in the table, I'd like to get the AUTO_INCREMENT value of the existing entry. Manually updating primary key in a row causes subsequent insert to fail / Duplicate entry for key. How do I import CSV file into a MySQL table? Jack McDevitt book where a toy-like spaceship turns out to be real for a small butterfly-like spacefaring race. If you must avoid burning ids, you must test before inserting. ON DUPLICATE KEY UPDATE executes the UPDATE statement instead of the INSERT statement, LAST_INSERT_ID() gets incremented as if a row was added to the table, even though no such thing happened. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. SELECT and INSERT or UPDATE. ON DUPLICATE KEY UPDATE produce gaps on the auto_increment column. MariaDB ON DUPLICATE KEY UPDATE autoincrement, Podcast Episode 299: It’s hard to get hacked worse than this. Sometimes, your problem you think the bigger you have is only a tiny parameter... You can check the current value of the auto_increment with the following command: Then check the max value of the id and see if it looks right. The only base unsigned integer data type that is able to produced an error when a boundary is reached, is found when type is of BIGINT UNSIGNED. From the docs: If you specify ON DUPLICATE KEY UPDATE, and a row is inserted that would cause a duplicate value in a UNIQUE index or PRIMARY KEY, MySQL performs an UPDATE of the old row. Note: If I just provide an unused value for id, like INSERT INTO wp_abk_period (id, pricing_id, apartment_id) VALUES (3333333, 13, 27) it works fine, but then again, it is set as auto_increment so I shouldn't need to do this! Otherwise we want to increase views_count field by 1. The row/s affected value is reported as 1 if a row is inserted, and 2 if a row is updated, unless the API's CLIENT_FOUND_ROWSflag is set. Is this house-rule that has each monster/NPC roll initiative separately (even when there are multiple creatures of the same kind) game-breaking? What is the difference between an Electron, a Tau, and a Muon? With ON DUPLICATE KEY UPDATE, the affected-rows value per row is 1 if the row is inserted as a new row and 2 if an existing row is updated. INSERT INTO t1 (a,b,c) VALUES (1,2,3) ON DUPLICATE KEY UPDATE c=c+1; UPDATE t1 SET c=c+1 WHERE a=1; Thanks for your answer. @RickJames I spend 4-6 hours on this site every day, so I'm inclined to call myself the slave. Added auto_increment after data was in the table? The wreaks havoc with some simplistic designs for queuing. If the string already exists in the table, I'd like to get the AUTO_INCREMENT value of the existing entry. These 2 tables might have different contents and different file system locations which might lead to the described problem. There are three possible settings for the innodb_autoinc_lock_mode configuration parameter. And not increment auto increment fields if index check failed. Resolution: Fixed Affects Version/s: 10.0.14, 5.5, 10.0. What is the difference between an Electron, a Tau, and a Muon? Devart's method can show whether a row was inserted or updated. I created all the tables myself with create statements as above. Type: Bug Status: Closed (View Workflow) Priority: Major . mysql> CREATE TABLE `bla1` Recently i saw in my database (InnoDB), that my "ID" column which is set to autoincrement, does count a bit weird. When you insert a new row into a table if the row causes a duplicate in UNIQUE index or PRIMARY KEY , MySQL will issue an error. Would a lobby-like system of self-governing work? For example, if column a is declared as UNIQUE and contains the value 1, the following two statements have similar effect: . I think you need to get over worrying about gaps. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Why does the Indian PSLV rocket have tiny boosters? Syntax : INSERT INTO table (column_names) VALUES (values) ON DUPLICATE KEY UPDATE col1 = val1, col2 = val2 ; When you make an "insert ... on duplicate key update" auto_increment adds 1 to every row, that just was updated. Press CTRL+C to copy. INSERT INTO t1 (a,b,c) VALUES (1,2,3) ON DUPLICATE KEY UPDATE c=c+1; UPDATE t1 SET c=c+1 WHERE a=1; (The effects are not identical for an InnoDB table where a is an auto-increment column. Permalink. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. no (or at least I don't think so). Jack McDevitt book where a toy-like spaceship turns out to be real for a small butterfly-like spacefaring race. It is not recommended to use this statement on tables with more than one unique index. The output of. Asking for help, clarification, or responding to other answers. If you're still concerned, then use an UNSIGNED BIGINT which has 2^64-1 distinct values. Example: create table t1 (a int primary key auto_increment, b int unique, c varchar(20)) engine=innodb; insert t1 (b) values (10),(20),(30); insert t1 (b) values (20) on duplicate key update c='! Sometimes, when updating on duplicate key it comes in handy to use VALUES() in order to access the original value that was passed to … What do you exaclty mean by test before inserting? Now it's probably the case that auto-increment occurs when you insert and no duplicate key is found. I thought this might be possible using INSERT ... ON DUPLICATE KEY UPDATE..., but LAST_INSERT_ID() seems to be unusable in this case. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. Note that it does not supply the id in the INSERT. Fix Version/s: 5.5.41, 10.0.16. This bug is related to bug #83030. Ask Question Asked 9 years, 7 months ago. thanks! When debugging this problem check the table name case sensitivity (especially if you run MySql not on Windows). If you were to generate 1 auto-inc id every second (whether it results in an INSERT or else it's discarded), that would last 136 years. As I informed you before, it is not documented that INSERT IGNORE … Log In. – Pekka Sep 19 '10 at 20:35 Whether or not the auto increment number changes is not really a concern. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Component/s: Data Manipulation - Update. But let's use ON DUPLICATE KEY UPDATE. INSERT INTO users (user, group) VALUES ('username', 'group') ON DUPLICATE KEY UPDATE username = 'username', group = 'group' autoincrement counts the ID, so now my table is looking as follows: Prevent auto increment on MySQL duplicate insert. Does it need to be a primary key? ON DUPLICATE KEY UPDATE never creates a new row, so it cannot be incrementing. If you specify an ON DUPLICATE KEY UPDATE clause and a row to be inserted would cause a duplicate value in a UNIQUE index or PRIMARY KEY, an UPDATE of the old row occurs. If more than one unique index is matched, only the first is updated. Trouble with the numerical evaluation of a series. INSERT INTO t1 (a,b,c) VALUES (1,2,3) ON DUPLICATE KEY UPDATE c=c+1; UPDATE t1 SET c=c+1 WHERE a=1; @andy - You can't start over without throwing out all the ids. So far the tests are based on unsigned integer types. How to increment a field in MySql using "ON DUPLICATE KEY UPDATE" when inserting multiple rows? Environment: Red Hat Enterprise Linux Description. “INSERT IGNORE” vs “INSERT … ON DUPLICATE KEY UPDATE”, How to avoid mysql 'Deadlock found when trying to get lock; try restarting transaction'. If not change the auto_increment value of your table. Recently i saw in my database (InnoDB), that my "ID" column which is set to autoincrement, does count a bit weird. for collecting all the relics without selling any? ON DUPLICATE KEY UPDATE, but that's actually hardly important issue" mentioned in the great comment dated "[20 Dec 23:24] Przemyslaw Malkowski" Important or not, but I'd say it's a bug in InnoDB's implementation of auto_increment. E.g. unfortunately neither (1) "Added auto_increment after data was in the table" nor (2) "Altered the auto_increment value after data was inserted into the table?" If the table has an AUTO_INCREMENT primary ke… Try something like this: INSERT INTO example (id, a, b, c) VALUES (1,1,2,3) ON DUPLICATE KEY UPDATE a = VALUES(a), b = VALUES(b), c = VALUES(c); Now if, the id is duplicate, the row will update. Is there a word for the object of a dilettante? ON DUPLICATE KEY UPDATE when the inserted columns include NULL in an auto-increment column . Here's a method to tell you the id of the row which was inserted or updated. Export . Hi, If you add another command, mysql> insert into bla1 values (NULL, "Cello3", NULL) on duplicate key update whentime = NOW(); The right ID will be used. Means, when you have 50 inserts (from 1-50) and you then 4 updates happens, the next value, auto_increment will insert is 55. If you specify an ON DUPLICATE KEY UPDATE clause and a row to be inserted would cause a duplicate value in a UNIQUE index or PRIMARY KEY, an UPDATE of the old row occurs. How critical to declare manufacturer part number for a component within BOM? ALTER TABLE my_freshly_deleted_table AUTO_INCREMENT = … Since last_insert_id() has a connection scope, it's better for you to use : select max(id) from bla1; Mathias Selon Sven Paulus
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