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.