alter system checkpoint
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checkpoint_clause
Specify CHECKPOINT
to explicitly force Oracle Database to perform a checkpoint, ensuring that all changes made by committed transactions are written to datafiles on disk. You can specify this clause only when your instance has the database open. Oracle Database does not return control to you until the checkpoint is complete.
GLOBAL In a Real Application Clusters environment, this setting causes Oracle Database to perform a checkpoint for all instances that have opened the database. This is the default.
LOCAL In a Real Application Clusters environment, this setting causes Oracle Database to perform a checkpoint only for the thread of redo log file groups for the instance from which you issue the statement.
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