Difference between revisions of "Oracle Secure Files"
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| Line 12: | Line 12: | ||
* De-duplication | * De-duplication | ||
** Oracle stores only reference if identical copy of LOB data is already in database. Oracle uses a secure hash index to detect duplication. | ** Oracle stores only reference if identical copy of LOB data is already in database. Oracle uses a secure hash index to detect duplication. | ||
| − | + | <pre> | |
alter table contracts_sec modify lob(orig_file)(DEDUPLICATE LOB); | alter table contracts_sec modify lob(orig_file)(DEDUPLICATE LOB); | ||
</pre> | </pre> | ||
** Main benefit is dramatic reduction in storage usage. | ** Main benefit is dramatic reduction in storage usage. | ||
| + | |||
| + | * Compression | ||
| + | ** Oracle stores only reference if identical copy of LOB data is already in database. | ||
| + | <pre> | ||
| + | alter table contracts_sec modify lob(orig_file)(COMPRESS HIGH); | ||
| + | </pre> | ||
| + | ** Uncompress only the required set of data blocks for random read and write access | ||
| + | ** Default compression is MEDIUM. | ||
| + | ** Advanced Compression Option License is required | ||
| + | |||
| + | * Encryption | ||
| + | * Supports the industry-standard encryption algorithms: 3DES168, AES128, AES192 (default), and AES256. | ||
| + | <pre> | ||
| + | alter table contracts_sec modify lob(orig_file)(ENCRYPT USING 'AES128'); | ||
| + | </pre> | ||
| + | * Advanced Compression Option License is required. | ||
| + | |||
[[Category:Database_Features]] | [[Category:Database_Features]] | ||
Revision as of 19:19, 14 March 2011
What is SecureFiles?
- Current solutions to store unstructured or semi-structured data
- LOB – part of database but there is a limitation in sizing, low concurrency of DMLs
- OS Files – ease of access, compressed format, but not part of db backup nor security
- The SecureFiles in 11g gives the best features of database-resident LOBs and OS files.
- Note that traditional LOBs are still available in the form of BasicFiles.
Benefits of the SecureFiles
- Variable chunk size
- De-duplication
- Oracle stores only reference if identical copy of LOB data is already in database. Oracle uses a secure hash index to detect duplication.
alter table contracts_sec modify lob(orig_file)(DEDUPLICATE LOB);
- Main benefit is dramatic reduction in storage usage.
- Compression
- Oracle stores only reference if identical copy of LOB data is already in database.
alter table contracts_sec modify lob(orig_file)(COMPRESS HIGH);
- Uncompress only the required set of data blocks for random read and write access
- Default compression is MEDIUM.
- Advanced Compression Option License is required
- Encryption
- Supports the industry-standard encryption algorithms: 3DES168, AES128, AES192 (default), and AES256.
alter table contracts_sec modify lob(orig_file)(ENCRYPT USING 'AES128');
- Advanced Compression Option License is required.
