9.33 V$LCR_CACHE

V$LCR_CACHE displays information about entries in the logical change record (LCR) cache.

Column Datatype Description

LCR_TYPE

CHAR(12)

Indicates whether the LCR is INTERNAL or EXTERNAL

COMPONENT_NAME

VARCHAR2(128)

Component name

COMPONENT_TYPE

VARCHAR2(40)

Component type. Possible values:

  • APPLY COORDINATOR
  • APPLY READER
  • APPLY SERVER
  • CAPTURE COORDINATOR
  • CAPTURE READER
  • CAPTURE SERVER

NUM_COLUMNS

NUMBER

Number of columns in the LCR

FREE_COUNT

NUMBER

Number of available LCRs

REQUEST_COUNT

NUMBER

Total request count

CACHE_HITS

NUMBER

Cache hit count

ALT_CACHE_HITS

NUMBER

Hit count from an alternate LCR cache entry

PURGED_COUNT

NUMBER

Cache purge count

SID

NUMBER

Session ID of the component process

SERIAL#

NUMBER

Session serial number of the component process

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

Note:

This view is available starting with Oracle Database 21c.