BLOB Clean up

Oracle 12 c

OS Linux.

As I understand it, in what concerns the storage of BLOB (such as image files or audio) data, only the reference to the BLOB is stored in the table, while the data itself is stored outside the table, somewhere in the file system of the server.  Is this correct?  If so, then I have a few questions:


(1) pourraient all those related to the view of database or change the BLOB data directly?  This will pose a real risk to safety?


(2) the issue of removal:

When I run the "removal of the TABLE where row_id = 12345" command, will be the reference and the BLOB data deleted from the system, OR, that the reference will be removed, while the BLOB data will be left behind and I run scripts of cleaning using cron or some other tool of periodic planning?




Thank you


Scott

958303 wrote:

Oracle 12 c

OS Linux.

As I understand it, in what concerns the storage of BLOB (such as image files or audio) data, only the reference to the BLOB is stored in the table, while the data itself is stored outside the table, somewhere in the file system of the server.  Is this correct?  If so, then I have a few questions:

(1) pourraient all those related to the view of database or change the BLOB data directly?  This will pose a real risk to safety?

(2) the issue of removal:

When I run the "removal of the TABLE where row_id = 12345" command, will be the reference and the BLOB data deleted from the system, OR, that the reference will be removed, while the BLOB data will be left behind, and I need to run the scripts of cleaning using cron or another recurring planning tool?

Thank you

Scott

https://docs.Oracle.com/database/121/ADLOB/adlob_smart.htm#ADLOB4444

BLOBs are stored in the database (still technically on disk, but not in the sense I think mean you in your question).

BFILE is stored on the file system (the database stores a pointer to the file).

https://docs.Oracle.com/database/121/SQLRF/sql_elements001.htm#SQLRF0021

"

LOB (large Object) data types

Integrated LOB data types BLOB , CLOB , and NCLOB (stored internally) and BFILE (stored externally) can store large and structured data such as text, image, video, and data space. The size of BLOB , CLOB , and NCLOB data can be up to (232-1 bytes) * (the value of the CHUNK parameter of LOB storage). Storage in your database are standard block size, so if you have used the value by default to the CHUNK LOB storage parameter when you create a LOB column, then this is equivalent to (232-1 bytes) * (database block size). BFILE data can be up to 264-1 bytes, even if your operating system may impose restrictions on the maximum.

"

See you soon,.

Tags: Database

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