COMMIT_WRITE

1.46 COMMIT_WRITE

COMMIT_WRITE is an advanced parameter used to control how redo for transaction commits is written to the redo logs.

Property	Description
Parameter type	String
Syntax	`COMMIT_WRITE = '{IMMEDIATE \| BATCH},{WAIT \|NOWAIT}'`
Default value	If this parameter is not explicitly specified, then database commit behavior defaults to writing commit records to disk before control is returned to the client. If only `IMMEDIATE` or `BATCH` is specified, but not `WAIT` or `NOWAIT`, then `WAIT` mode is assumed. If only `WAIT` or `NOWAIT` is specified, but not `IMMEDIATE` or `BATCH`, then `IMMEDIATE` mode is assumed. Be aware that the `NOWAIT` option can cause a failure that occurs after the database receives the commit message, but before the redo log records are written. This can falsely indicate to a transaction that its changes are persistent. Also, it can violate the durability of ACID (Atomicity, Consistency, Isolation, Durability) transactions if the database shuts down unexpectedly.
Modifiable	Yes (at both session-level and system-level). Values supplied for `COMMIT_WRITE` in an `ALTER SYSTEM` or `ALTER SESSION` statement must be separated by a comma.
Modifiable in a PDB	Yes
Range of values	Single-quoted, comma-separated list of either `IMMEDIATE` or `BATCH`, and either `WAIT` or `NOWAIT`.
Basic	No
Oracle RAC	Each instance may have its own setting

The IMMEDIATE and BATCH options control how redo is batched by Log Writer. The WAIT and NOWAIT options control when the redo for a commit is flushed to the redo logs.

Note:

The COMMIT_WRITE parameter is deprecated. It is retained for backward compatibility only. It is replaced by the COMMIT_LOGGING and COMMIT_WAIT parameters.