WebApr 12, 2024 · Okay, given you commented above that you only need to update the rows that spawned the trigger, you can do that without using UPDATE in the body of the trigger.. DELIMITER $$ CREATE TRIGGER update_order_state BEFORE UPDATE ON orders FOR EACH ROW BEGIN IF ( NEW.payment_date IS NOT NULL AND NEW.order_state IN (1, 2) ) THEN … WebMay 6, 2015 · alter table candidate_candidate add column responsible_user_id int, algorithm=INPLACE, lock=NONE; Query OK, 0 rows affected (0.48 sec) Records: 0 Duplicates: 0 Warnings: 0 So I am sure that this kind of operation can be done online.
MySQL :: MySQL 5.7 Reference Manual :: 14.13.1 Online DDL …
WebThe example shown here requires LOCK TABLES to execute safely: Press CTRL+C to copy. LOCK TABLES trans READ, customer WRITE; SELECT SUM (value) FROM trans WHERE customer_id=some_id; UPDATE customer SET total_value=sum_from_previous_statement WHERE customer_id=some_id; UNLOCK TABLES; WebDec 7, 2024 · Dump without locking tables and the --skip-lock-tables flag. Using --skip-lock-tables prevents table locking during the dump process. This is important when backing up a production database that you cannot lock it down during the dump. Generally it is recommended to use --skip-lock-tables whenever you are dumping InnoDB tables. … buff gura
Mysql Alter table add column with …
WebCan I use the "MySQL Adminstrator" GUI database administration utility on my MOVEit server? WebStarting with SQL Server 2012 (11.x) Enterprise Edition, adding a NOT NULL column with a default value is an online operation when the default value is a runtime constant. This means that the operation is completed almost instantaneously despite the number of rows in the table. Because, the existing rows in the table aren't updated during the ... WebFor example, if you want to make sure the locks are never escalated above individual rows, you can use this: UPDATE mytable WITH (ROWLOCK) SET col1 = 'something' WHERE col2 = 'somethingelse'. This suggests SQL to lock only the rows affected by the query, and never escalate locks to contain pages or the entire table. buff gumball pfp