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filesystem_like_logging Tips

Oracle Tips by Donald BurlesonMay 22, 2017

Question:

A table with blob column and filesystem_like_logging feature is created using following script:

create table contracts_sec_fs
(
        contract_id     number(12),
        contract_name   varchar2(80),
        file_size       number,
        orig_file       blob
)
tablespace users
lob (orig_file)
store as securefile
(
        tablespace users
        enable storage in row
        chunk 8192
        pctversion 20
        nocache
filesystem_like_logging
);

But filesystem_like_logging is not valid syntax for the DDL of the table.

Answer: 

This may help:

http://www.dba-oracle.com/t_11g_new_shared_io_pool.htm

Securefile lobs can be created with different LOGGING options.


Another alternative is FILESYSTEM_LIKE_LOGGING. This only created redo for the metadata of the securefile lob. This reduces the mean time to recover in case of an instance crash. At the same time full data recoverability is ensured. The drawback here is that data can change during an online backup which would lead to inconsistency in. This would be fatal in case of media recovery being necessary.

% Make sure that LOGGING is enforced for the lob storage during online backups!

% Make sure that all redo which was generated during the online backup is archived!

Here is the syntax to enforce logging and to disable it again:

LUTZ AS SYSDBA @ orcl SQL> ALTER DATABASE FORCE LOGGING;
?
LUTZ AS SYSDBA @ orcl SQL> ALTER DATABASE NO FORCE LOGGING;


 


   
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