How do I find the size of a tablespace block?
You can query the user_tablespaces or dba_tablespaces (if you have access) and see the block size for each tablespace; these views usually run instantly.
What is the sizing of DB block size?
DB_BLOCK_SIZE specifies (in bytes) the size of Oracle database blocks. Typical values are 4096 and 8192 .
What is Oracle block size?
“rule of thumb” is Oracle Database block sizes (2 KB or 4 KB) for online transaction processing (OLTP) or mixed workload environments and larger block sizes (8 KB, 16 KB, or 32 KB) for decision support system (DSS) workload environments.
What is the default block size in Oracle 12c?
The default block size is 8k in Oracle. This is the most common. Sometimes, people create the database with 16k block size for datawarehouses. You can also find some 32k block size, but less common which means more bugs.
How do I create a different tablespace block size?
Use the BLOCKSIZE clause of the CREATE TABLESPACE statement to create a tablespace with a block size different from the database standard block size. In order for the BLOCKSIZE clause to succeed, you must have already set the DB_CACHE_SIZE and at least one DB_nK_CACHE_SIZE initialization parameter.
How do I change my DB block size?
The DB block size is one of the Oracle system parameters. The default DB block size cannot be changed once the database is created, but multiple DB block sizes can be set up to meet the requirement.
What is the maximum database size in Oracle?
The maximum size of the single datafile or tempfile is 128 terabytes (TB) for a tablespace with 32 K blocks and 32 TB for a tablespace with 8 K blocks.
Can we change DB block size?
What is the default block size in database can we use different block sizes and how?
The block size for data warehouses is often 32K (you want many rows to be read at a time) and OLTP systems are often 8K. Most experts recommend an 8K block size. The data block cache for the default block size is set using the DB_CACHE_SIZE initialization parameter.
How do I change the block size in Oracle 12c?
You cannot modify the data block size after a database is created. You can only create a new database with the correct block size, export the old database and do a full import into the new database.
Can we change db block size?
Can we change DB_BLOCK_SIZE?
The DB_BLOCK_SIZE is the size of the default data block size when the database is created. Converting database from one block size to another is not directly possible.