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Question 52/72
Your Database Machine has a large database with some very large tables supporting OLTP workloads.
High volume Insert applications and high volume update workloads access the same tables.
You decide to compress these tables without causing unacceptable performance overheads to the OLTP application.
Which three are true regarding this requirement?
High volume Insert applications and high volume update workloads access the same tables.
You decide to compress these tables without causing unacceptable performance overheads to the OLTP application.
Which three are true regarding this requirement?
Correct Answer: A,C,E
Explanation/Reference:
Note:
(E not B):
* Types of compression
Basic compression
OLTP compression
Warehouse compression
Online archival compressio
* /OLTP compression allows compression during DML operations.
/Basic compression works at the data block level.
* When you enable table compression by specifying COMPRESS FOR OLTP, you enable OLTP table compression. Oracle Database compresses data during all DML operations on the table. This form of compression is recommended for OLTP environments.
* When you specify COMPRESS FOR QUERY or COMPRESS FOR ARCHIVE, you enable hybrid columnar compression. With hybrid columnar compression, data can be compressed during bulk load operations. During the load process, data is transformed into a column-oriented format and then compressed. Oracle Database uses a compression algorithm appropriate for the level you specify. In general, the higher the level, the greater the compression ratio.
Hybrid columnar compression can result in higher compression ratios, at a greater CPU cost. Therefore, this form of compression is recommended for data that is not frequently updated.
Note:
(E not B):
* Types of compression
Basic compression
OLTP compression
Warehouse compression
Online archival compressio
* /OLTP compression allows compression during DML operations.
/Basic compression works at the data block level.
* When you enable table compression by specifying COMPRESS FOR OLTP, you enable OLTP table compression. Oracle Database compresses data during all DML operations on the table. This form of compression is recommended for OLTP environments.
* When you specify COMPRESS FOR QUERY or COMPRESS FOR ARCHIVE, you enable hybrid columnar compression. With hybrid columnar compression, data can be compressed during bulk load operations. During the load process, data is transformed into a column-oriented format and then compressed. Oracle Database uses a compression algorithm appropriate for the level you specify. In general, the higher the level, the greater the compression ratio.
Hybrid columnar compression can result in higher compression ratios, at a greater CPU cost. Therefore, this form of compression is recommended for data that is not frequently updated.
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