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Oracle® Database Reference
11g Release 2 (11.2)

E40402-14
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V$MEMORY_TARGET_ADVICE

V$MEMORY_TARGET_ADVICE provides information about how the MEMORY_TARGET parameter should be sized based on current sizing and satisfaction metrics.

Column Datatype Description
MEMORY_SIZE NUMBER If the MEMORY_SIZE_FACTOR column has a value of 1, then this column shows the current size of memory, as set by the MEMORY_TARGET initialization parameter.

If the value of the MEMORY_SIZE_FACTOR column is less than or greater than 1, then this column shows a proposed memory size.

MEMORY_SIZE_FACTOR NUMBER A multiplier for the current memory size. Possible values are 0.25, 0.5, 0.75, 1, 1.5, 1.75, and 2. This multiplier times the current memory size equals the value of the MEMORY_SIZE column.
ESTD_DB_TIME NUMBER For current memory size (MEMORY_SIZE_FACTOR = 1), the amount of database time required to complete the current workload. For a proposed memory size, the estimated amount of database time that would be required if the MEMORY_TARGET parameter were changed to the proposed size.
ESTD_DB_TIME_FACTOR NUMBER For a proposed memory size, ratio of estimated database time to current database time
VERSION NUMBER Version number of this recommendation (this snapshot of the V$MEMORY_TARGET_ADVICE view)

Table 8-2 shows how the information provided in V$MEMORY_TARGET_ADVICE could be used to improve performance. The data indicates that if current memory size is 380M, and you were to increase it to 760M (2x), the current workload would take 80525 units of DBtime as opposed to 115475 units of DBtime, which is a significant improvement in performance.

Table 8-2 Example of Using V$MEMORY_TARGET_ADVICE

MEMORY_SIZE MEMORY_SIZE_FACTOR ESTD_DB_TIME ESTD_DB_TIME_FACTOR VERSION

380

1

115475

1

3

95

.25

200500

1.7

3

190

.5

125600

1.1

3

760

2

80525

0.7

3