The enterprise data warehouse routinely receives data from various production OLTP databases. The database block size on the data warehouse is 8192, and in the OLTP databases it may be 2048, 4096 or 8192. The current SGA is 112 MB. Oracle9i has the ability to transport tablespaces with different block sizes. Which two parameters are required in order to "plug in" the OLTP tablespaces into the warehouse database? (Choose two.)
A. DB_2K_CACHE_SIZE
B. DB_4K_CACHE_SIZE
C. DB_8K_CACHE_SIZE
D. DB_2K_BLOCK_BUFFERS
E. DB_4K_BLOCK_BUFFERS
F. DB_8K_BLOCK_BUFFERS
Answer: A, B
Explanation:
DB_2K_CACHE_SIZE and DB_4K_CACHE_SIZE parameters are required in order to “plug in” the OLTP tablespaces into the warehouse database. DB_CACHE_SIZE specifies the database buffer cache sized to the standard block size. Oracle 9i can also support four additional block sizes; you can specify the buffer cache size corresponding to each of these block sizes with the DB_nK_CACHE_SIZE parameter. It this parameter, nK stands for the nonstandard block size; n can take the following values: 2, 4, 8, 16, or 32.
Incorrect Answers
C: The database block size on the data warehouse is 8192, so DB_8K_CACHE_SIZE does not need to be specified.
D: There is no DB_2K_BLOCK_BUFFERS parameter in Oracle. You can specify the buffer cache size with the DB_nK_CACHE_SIZE parameter.
E: There is no DB_4K_BLOCK_BUFFERS parameter in Oracle. You can specify the buffer cache size with the DB_nK_CACHE_SIZE parameter.
F: There is no DB_8K_BLOCK_BUFFERS parameter in Oracle. You can specify the buffer cache size with the DB_nK_CACHE_SIZE parameter.
OCP Oracle9i Database: New Features for Administrators, Daniel Benjamin, p. 164-166
Chapter 3: Manageability Enhancements
Oracle 9i New Features, Robert Freeman, p. 14-16
Chapter 1: Oracle9i Database Administration and Management Features
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