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