Skip Headers
Oracle® Database PL/SQL Packages and Types Reference
11g Release 2 (11.2)

Part Number E16760-04
Go to Documentation Home
Home
Go to Book List
Book List
Go to Table of Contents
Contents
Go to Index
Index
Go to Master Index
Master Index
Go to Feedback page
Contact Us

Go to previous page
Previous
Go to next page
Next
View PDF

50 DBMS_DBFS_SFS

The DBMS_DBFS_SFS package provides an interface to operate a SecureFile-based store (SFS) for the content interface described in the DBMS_DBFS_CONTENT package.

See Also:

Oracle Database SecureFiles and Large Objects Developer's Guide

This chapter contains the following topics:


Using DBMS_DBFS_SFS


Overview

The DBMS_DBFS_SFS package is a sample implementation of a package that implements and extends the DBMS_DBFS_CONTENT_SPI interface. It provides a POSIX-compliant file system stored in the RDBMS.


Security Model

The DBMS_DBFS_SFS package runs with AUTHID CURRENT_USER.


Constants

The DBMS_DBFS_SFS package uses the constants shown in following tables:

Table 50-1 DBMS_DBFS_SFS Constants - Compression Levels

Constant Type Value Description

COMPRESSION_DEFAULT

VARCHAR2(32)

''

Use the default SecureFile compression level

COMPRESSION_LOW

VARCHAR2(32)

'LOW'

Use compression level 'LOW'

COMPRESSION_MEDIUM

VARCHAR2(32)

'MEDIUM'

Use compression level 'MEDIUM'

COMPRESSION_HIGH

VARCHAR2(32)

'HIGH'

Use compression level 'HIGH'


Table 50-2 DBMS_DBFS_SFS Constants - Used by the encryption Parameter

Constant Type Value Description

ENCRYPTION_DEFAULT

VARCHAR2(32)

''

Use the default SecureFile encryption algorithm

ENCRYPTION_3DES168

VARCHAR2(32)

'3DES168'

Use encryption 3DES 168 bit

ENCRYPTION_AES128

VARCHAR2(32)

'AES128'

Use encryption AES 128 bit

ENCRYPTION_AES192

VARCHAR2(32)

'AES192'

Use encryption AES 192 bit

ENCRYPTION_AES256

VARCHAR2(32)

'AES256'

Use encryption AES 256 bit


Table 50-3 DBMS_DBFS_SFS Constants - Used by the npartitions Parameter

Constant Type Value Description

DEFAULT_PARTITIONS

INTEGER

16

Default to 16 partitions


Table 50-4 DBMS_DBFS_SFS Constants - Used by the partition_key Parameter

Constant Type Value Description

PARTITION_BY_ITEM

INTEGER

1

Use a hash of the item name for the partition key

PARTITION_BY_PATH

INTEGER

2

Use a hash of the path name for the partition key

PARTITION_BY_GUID

INTEGER

3

Use a hash of the GUID as the partition key



Summary of DBMS_DBFS_SFS Subprograms

Table 50-5 DBMS_DBFS_SFS Package Subprograms

Subprogram Description

CREATEFILESYSTEM Procedure

Creates a file system store

CREATESTORE Procedure

Creates a new DBFS SFS store

DROPFILESYSTEM Procedures

Drops the DBFS SFS store

INITFS Procedure

Initializes a POSIX file system store



CREATEFILESYSTEM Procedure

This procedure creates a file system store.

Syntax

DBMS_DBFS_SFS.CREATEFILESYSTEM (
   store_name         IN     VARCHAR2,
   schema_name        IN     VARCHAR2    DEFAULT NULL,
   tbl_name           IN     VARCHAR2    DEFAULT NULL,
   tbl_tbs            IN     VARCHAR2    DEFAULT NULL,
   lob_tbs            IN     VARCHAR2    DEFAULT NULL,
   use_bf             IN     BOOLEAN     DEFAULT FALSE,
   properties         IN     DBMS_DBFS_CONTENT_PROPERTIES_T DEFAULT NULL,
   create_only        IN     BOOLEAN     FALSE,
   use_objects        IN     BOOLEAN     DEFAULT FALSE,
   with_grants        IN     BOOLEAN     DEFAULT FALSE,
   do_dedup           IN     BOOLEAN     DEFAULT FALSE,
   do_compress        IN     BOOLEAN     DEFAULT FALSE
   compression        IN     VARCHAR2    DEFAULT COMPRESSION_DEFAULT,
   do_encrypt         IN     BOOLEAN     DEFAULT FALSE,
   encryption         IN     VARCHAR2    DEFAULT ENCRYPTION_DEFAULT,
   do_partition       IN     BOOLEAN     DEFAULT FALSE,
   npartitions        IN     NUMBER      DEFAULTDEFAULT_PARTITIONS,
   partition_key      IN     NUMBER      DEFAULT PARTITION_BY_ITEM,
   partition_guidi    IN     BOOLEAN     DEFAULT FALSE,
   partition_pathi    IN     BOOLEAN     DEFAULT FALSE,
   partition_prop     IN     BOOLEAN     DEFAULT TRUE);

Parameters

Table 50-6 CREATEFILESYSTEM Procedure Parameters

Parameter Description

store_name

Name of store

schema_name

Schema for the store, defaulting to the current schema

tbl_name

Table for store entries. If not specified, an internally generated name is used.

tbl_tb

Tablespace for the store, defaulting to the schema's default tablespace

lob_tbs

Tablespace in which to create the LOB segment. It defaults to the user's default tablespace.

use_bf

If TRUE, a BasicFile LOB is used; otherwise a SecureFile LOB is used.

properties

Table of (name, value, typecode) tuples used to configure the store properties. Currently no such properties are defined or used.

create_only

If TRUE, the file system is created, but not registered with the current user

use_objects

If TRUE, a single base-table with an object-type column (using a nested table) is created to backup the new file system. Otherwise, a pair of (parent, child) tables is used to backup the file system. In both cases, the object type nested table or the child table is used only for user-defined properties.

with_grants

If TRUE, DML and query access permissions are granted to the DBFS_ROLE as part of creating the file system. Otherwise, explicit grants (or existing permissions) are required to access the file system.

do_dedup

If TRUE, do deduplication the underlying SecureFile column

do_compress

If TRUE, do compression the underlying SecureFile column

compression

Compression algorithm to use (see DBMS_DBFS_SFS Constants - Compression Levels)

do_encrypt

If TRUE, encrypt the underlying SecureFile column

encryption

encryption algorithm to use (see DBMS_DBFS_SFS Constants - Used by the encryption Parameter)

do_partition

If TRUE, partition the table used for storage

npartitions

Number of partitions to create for the table (see DBMS_DBFS_SFS Constants - Used by the npartitions Parameter).

partition_key

How to partition the table: by item name, by path name, or by GUID (see DBMS_DBFS_SFS Constants - Used by the partition_key Parameter).

partition_guidi

If TRUE, build an index on GUID

partition_pathi

If TRUE, build an index on path name

partition_prop

If TRUE, partition the properties table


Usage Notes

The procedure executes like a DDL in that it auto-commits before and after its execution.


CREATESTORE Procedure

This procedure creates a new DBFS SFS store owned by the invoking session user.

Syntax

DBMS_DBFS_SFS.CREATESTORE  (
   store_name     IN     VARCHAR2,
   tbl_name       IN     VARCHAR2  DEFAULT NULL,
   tbs_name       in     VARCHAR2  DEFAULT NULL,
   use_bf         in     BOOLEAN   DEFAULT FALSE,
   stgopts        in     VARCHAR2 DEFAULT '');

Parameters

Table 50-7 CREATESTORE Procedure Parameters

Parameter Description

store_name

Name of store

store_type

STORETYPE_TAPE or STORETYPE_AMAZONS3

tbl_name

Placeholder for the store content cached in database

tbs_name

Named tablespace

use_bf

If TRUE, a BasicFile LOB is used; otherwise a SecureFile LOB is used.

stgopts

Currently non-operational, reserved for future use



DROPFILESYSTEM Procedures

This procedure drops the DBFS SFS store, purging all dictionary information associated with the store, and dropping the underlying file system table.

Syntax

DBMS_DBFS_SFS.DROPFILESYSTEM  (
   schema_name    IN      VARCHAR2 DEFAULT NULL,
   tbl_name       IN      INTEGER);

DBMS_DBFS_SFS.DROPFILESYSTEM  (
   store_name     IN      VARCHAR2);

Parameters

Table 50-8 DROPFILESYSTEM Procedure Parameters

Parameter Description

schema_name

Name of schema

tbl_name

Name of tablespace

store_name

Name of store path


Usage Notes


INITFS Procedure

This procedure initialize a POSIX file system store. The table associated with the POSIX file system store store_name is truncated and reinitialized with a single "root" directory entry.

Syntax

DBMS_DBFS_SFS.INITFS (
   store_name     IN      VARCHAR2);

Parameters

Table 50-9 INITFS Procedure Parameters

Parameter Description

store_name

Name of store


Usage Notes

The procedure executes like a DDL in that it auto-commits before and after its execution.