DB_SECUREFILE

1.91 DB_SECUREFILE

DB_SECUREFILE specifies whether to treat LOB files as SecureFiles.

Property	Description
Parameter type	String
Syntax	`DB_SECUREFILE = { NEVER \| PERMITTED \| PREFERRED \| ALWAYS \| IGNORE }`
Default value	`PERMITTED if the COMPATIBLE initialization parameter is set to 11.2.0.1, 11.2.0.2, or 11.2.0.3, or PREFERRED if the COMPATIBLE initialization parameter is set to 12.0.0.0 or higher`
Modifiable	`ALTER SESSION`, `ALTER SYSTEM`
Modifiable in a PDB	Yes
Basic	No

Values

NEVER

Any LOBs that are specified as SecureFiles are created as BasicFiles LOBs. All SecureFiles-specific storage options and features (for example, compress, encrypt, deduplicate) will cause an exception. The BasicFiles LOB defaults will be used for storage options not specified.
PERMITTED

LOBs are allowed to be created as SecureFiles.
PREFERRED

All LOBs are created as SecureFiles unless BASICFILE is explicitly specified in the LOB storage clause or the tablespace is a Manual Segment Space Management tablespace. When PREFERRED is set, cases where BASICFILE would otherwise be inherited from the partition or column level LOB storage are ignored; the LOBs will be created as SecureFiles instead.
ALWAYS

Attempts to create all LOBs as SecureFiles LOBs but creates any LOBs not in an Automatic Segment Space Managed (ASSM) tablespace as BasicFiles LOBs, unless SECUREFILE is explicitly specified. Any BasicFiles LOB storage options that are specified will be ignored and the SecureFiles LOB defaults will be used for all storage options not specified.
IGNORE

The SECUREFILE keyword and all SecureFiles options are ignored.

If the COMPATIBLE initialization parameter is not set to 11.1.0 or higher, then LOBs are not treated as SecureFiles.

If there is a LOB column with two partitions (one that has a tablespace for which ASSM is enabled and one that has a tablespace for which ASSM is not enabled), then LOBs in the partition with the ASSM-enabled tablespace will be treated as SecureFiles and LOBs in the other partition will be treated as BasicFiles.

If an application is not certified with SecureFiles, the value of the DB_SECUREFILE initialization parameter can be set to PERMITTED to get the default behavior of Oracle Database 11g.