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Background documentation Lock Locate the document in its SAP Library structure

The lock behavior depends among other things on the type of lock. Tables and rows are locked in a transaction with a defined lock mode (Requesting and Releasing a Lock).

The database system differentiates between the following locks:

The following table provides an overview of the possible parallel shared locks (S locks) and exclusive locks (E locks).

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A lock collision exists in the cases which are marked with "No"; i.e., after having requested a lock within a transaction, the user must wait for the lock to be released until one of the above situations or one of the situations that are marked with "Yes" in the matrix occurs.

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