V$EQ_MESSAGE_CACHE

V$EQ_MESSAGE_CACHE provides performance statistics of the message cache for Transactional Event Queues (TxEventQs) at the event stream partition level in the instance.

Column Datatype Description
QUEUE_ID NUMBER Queue ID
EVENT_STREAM_ID NUMBER Event stream ID
PRIORITY NUMBER Priority of the event stream partition for dequeue, range 0 - 9
EVENT_STREAM_PARTITION_ID NUMBER Event stream partition ID
PARTITION_ID NUMBER Queue partition ID
MAX_MSGS NUMBER Maximum number of messages for the event stream partition
ENQUEUED_MSGS NUMBER Number of messages enqueued for the event stream partition
MSGS_MADE_EXPIRED NUMBER Number of messages made expired
CHUNK_SIZE NUMBER The size of the memory chunk for storing messages
NUM_CHUNKS NUMBER Number of chunks for the event stream partition
NUM_FREE_CHUNKS NUMBER Number of free chunks for the event stream partition
USED_MEMORY_SIZE NUMBER Total estimated size of memory in use (in bytes) for the event stream partition
STATE VARCHAR2(13)

Event stream partition state. Possible values:

  • CACHED (in memory)

  • UNCACHED (on disk)

  • UNCACHED_FREE

  • CACHED_FREE

  • UNKNOWN
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

See Also: Oracle AI Database Transactional Event Queues and Advanced Queuing User’s Guide for more information about Oracle Transactional Event Queues and Advanced Queuing