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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