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ion recovery ? Some Oracle Server ponents do not participate in SQL statement processing. E10 Copyright 169。 Oracle Corporation, 2023. All rights reserved. Rollback Segment DML statement Old image New image Rollback segment Table E21 Copyright 169。 Oracle Corporation, 2023. All rights reserved. Hidden Slide E31 Copyright 169。 Oracle Corporation, 2023. All rights reserved. Database Writer (DBW0) DBW0 writes when: ? There are many dirty buffers ? There are few free buffers ? Timeout occurs ? Checkpoint occurs SGA Redo log buffer Data buffer cache Shared pool Database Redo log files Control files Data files DBW0 E26 Copyright 169。 Oracle Corporation, 2023. All rights reserved. Database Buffer Cache ? Stores the most recently used blocks ? Size of a buffer based on DB_BLOCK_SIZE ? Number of buffers defined by DB_BLOCK_BUFFERS Data buffer cache E16 Copyright 169。 Oracle Corporation, 2023. All rights reserved. Database Redo log files Control files Data files Overview User process Server process PGA Archived log files Parameter file Password file Instance SGA Redo log buffer Data buffer cache Shared pool Data dict.