Oracle内部视图:x$targetrba

SQL> desc x$targetrba
Name
-----------------------------------------
ADDR                               N/A

INDX                               N/A

INST_ID                            N/A

TOTALLOGSZ                         select sum(bytes)/redo_standard_size from v$log

LGLOGSZ                            select bytes/512 from v$Log where status='CURRENT'

CUR_EST_RCV_READS                  Number of dirty buffers in the buffer cache.
In the Standard Edition, this column is always null.

ACTUAL_REDO_BLKS                   Current actual number of redo blocks required for recovery

TARGET_RBA_SEQ                     target redo block address log sequence

TARGET_RBA_BNO                     target redo block address block number

TARGET_RBA_BOF                     target redo block address offset

MIN_LAG                            Current target number of redo blocks that must be processed for recovery.
This value is the minimum value of the following 3 columns,
and identifies which of the 3 user-defined limits determines checkpointing.

LOGFILESZ                          Maximum number of redo blocks required to guarantee that a
log switch does not occur before the checkpoint completes.

CT_LAG                             Number of redo blocks that need to be processed during
recovery to satisfy the LOG_CHECKPOINT_TIMEOUT parameter.
The value displayed is not meaningful unless that parameter has been set.

CI_LAG                             Number of redo blocks that need to be processed during recovery to
satisfy the LOG_CHECKPOINT_INTERVAL parameter.
The value displayed is not meaningful unless that parameter has been set.