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Select one or more table cells to edit. In Cell Format panel, clickCell Locking Unlocked.
This occurs when some user is accessing the table that DTP is using to fetch data and is accessing the same table for his/her work. You may find the lock entries in SM12 Tcode. But before deleting be sure that the user has completed his work on that table by asking him/her.
In MySQL, locked tables are identified using the SHOW OPEN TABLES command. In its simplest form is displays all locked tables. All open tables in the table cache are listed, but the IN_USE column indicates of the table is locked. When the first lock is taken, the value increments to 1.
A READ lock has the following features: A READ lock for a table can be acquired by multiple sessions at the same time. In addition, other sessions can read data from the table without acquiring the lock. The session that holds the READ lock can only read data from the table, but cannot write.
MySQL Table Locking. ... A lock is a flag associated with a table. MySQL allows a client session to explicitly acquire a table lock for preventing other sessions from accessing the same table during a specific period. A client session can acquire or release table locks only for itself.
If the tables use InnoDB, MySQL automatically uses row level locking so that multiple transactions can use same table simultaneously for read and write, without making each other wait. ... Row level locking also can be obtained by using SELECT ... FOR UPDATE statement for each rows expected to be modified.
MySQL uses row-level locking for InnoDB tables to support simultaneous write access by multiple sessions, making them suitable for multi-user, highly concurrent, and OLTP applications. ... Advantages of row-level locking: Fewer lock conflicts when different sessions access different rows. Fewer changes for rollbacks.
In MySQL, locked tables are identified using the SHOW OPEN TABLES command. In its simplest form is displays all locked tables. All open tables in the table cache are listed, but the IN_USE column indicates of the table is locked. When the first lock is taken, the value increments to 1.
Transaction concepts and locks are different. However, transaction used locks to help it to follow the ACID principles. If you want to the table to prevent others to read/write at the same time point while you are read/write, you need a lock to do this.
SELECTs do not normally do any locking that you care about on InnoDB tables. The default transaction isolation level means that selects don't lock stuff.
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