8.24 V$JAVA_POOL_ADVICE

V$JAVA_POOL_ADVICE displays information about estimated parse time in the Java pool for different pool sizes.

The sizes range from 10% of the current Java pool size or the amount of pinned Java library cache memory (whichever is higher) to 200% of the current Java pool size, in equal intervals. The value of the interval depends on the current size of the Java pool.

Parse time saved refers to the amount of time saved by keeping library cache memory objects in the Java pool, as opposed to having to reload these objects.

Column Datatype Description

JAVA_POOL_SIZE_FOR_ESTIMATE

NUMBER

Java pool size for the estimate (in megabytes)

JAVA_POOL_SIZE_FACTOR

NUMBER

Size factor with respect to the current Java pool size

ESTD_LC_SIZE

NUMBER

Estimated memory in use by the library cache (in megabytes)

ESTD_LC_MEMORY_OBJECTS

NUMBER

Estimated number of library cache memory objects in the Java pool of the specified size

ESTD_LC_TIME_SAVED

NUMBER

Estimated elapsed parse time saved (in seconds), owing to library cache memory objects being found in a Java pool of the specified size. This is the time that would have been spent in reloading the required objects in the Java pool had they been aged out due to insufficient amount of available free memory.

ESTD_LC_TIME_SAVED_FACTOR

NUMBER

Estimated parse time saved factor with respect to the current Java pool size

ESTD_LC_LOAD_TIME

NUMBER

Estimated elapsed time (in seconds) for parsing in a Java pool of the specified size

ESTD_LC_LOAD_TIME_FACTOR

NUMBER

Estimated load time factor with respect to the current Java pool size

ESTD_LC_MEMORY_OBJECT_HITS

NUMBER

Estimated number of times a library cache memory object was found in a Java pool of the specified size

CON_ID

NUMBER

The ID of the container to which the data pertains. Possible values include:

  • 0: This value is used for rows containing data that pertain to the entire CDB. This value is also used for rows in non-CDBs.

  • 1: This value is used for rows containing data that pertain to only the root

  • n: Where n is the applicable container ID for the rows containing data