What is Securefile LOB?

What is Securefile LOB?

The original LOB storage, now known as BASICFILE , is still the default storage method, but the SECUREFILE keyword enables the new storage method, which allows encryption for security and space savings using compression and deduplication.

What is Oracle Secure file?

Starting with Oracle Database 12c, SecureFiles is the default storage mechanism for LOBs in Oracle. In Oracle Database 11g Release1, ‘BASICFILE’ is the default storage LOB storage type. The keyword ‘SECUREFILE’ is used for specifying SecureFiles. The default LOB storage can be changed using the db_securefile parameter.

What is LOB in Oracle 11g?

Large Objects (LOBs) are a set of datatypes that are designed to hold large amounts of data. A LOB can hold up to a maximum size ranging from 8 terabytes to 128 terabytes depending on how your database is configured. Storing data in LOBs enables you to access and manipulate the data efficiently in your application.

How do I convert Basicfile to Securefile?

Migrate From Basicfile to Securefile

1. Export the table, create a new table with the same columns with the secure file lob and import the data into the new table.
2. Add securefile column to table, update with data in basicfile column.
3. With the command ALTER TABLE table_name MOVE …

What is result cache in Oracle 11g?

Result Cache is a new feature in Oracle 11g and it does exactly what its name implies, it caches the results of queries and puts it into a slice of the shared pool. If you have a query that is executed often and reads data that rarely changes, this feature can increase performance significantly.

Can LOB columns be compressed?

Like normal columns memory LOBs are compressed. It is not possible to compress and deduplicate LOB data.

What is LOB segment in Oracle?

A LOB is simply a pointer. It points to an index. the index points to the chunks that make up the LOB. Hence when you create a LOB, you will always get a lob index created (to find the chunks for the lob fast) and a segment that holds the lob data (chunks).

How do I move a lob partition to another tablespace?

Move Lob Segment to Another Tablespace in Oracle You can move any lob segment to another tablespace as follows. ALTER TABLE OWNER. TABLE_NAME MOVE LOB(LOB_COLUMN) STORE AS (TABLESPACE NEW_TABLESPACE_NAME);

How Result_cache works in Oracle?

So, the Result Cache is an area in the shared pool and contains the end results of a query execution. The output from the tkprof report of the trace file reveals that the query traversed through more than 347,000 rows to provide a final output that contains 300 rows of summary data, which is the result set.