Additional SQL Statement at the Start of a Transaction

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Introduction: You can find a description of this phase in section Phase 4 (Introduction).

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Some databases require the sending of an additional SQL statement due to incomplete committed read implementations. For example, a command can be used to block rows, columns or even entire tables. This is achieved by entering the required SQL command in (1). This command is executed whenever the node is entered and when at the same time a transaction is started on the registered database alias of the node.