Know more about RBA redo block address
2013-03-19 00:51
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A "Redo Block Address" (RBA) describes a physical location within a redo log file. An RBA consists of the following:
Log sequence number
Block number within log file
Byte offset within block
The structure of the redo block address is given below :
1 - The number of the redo log.
[4 bytes]
2 - The block offset from the beginning of the redo log file.
[4 bytes]
3 - The byte offset within the block.
[2 bytes]
Log sequence number v$logmnr_contents.RBASQN
Block number within log file v$logmnr_contents.RBABLK
Byte offset within block v$logmnr_contents.RBABYTE
So in this case, RBA [0x19.2.10] maps to Log squence 25, Block number 2 with byte offset 16.
With this information you should be able to find the details from v$logmnr_contents.
In particular, the buffer header information includes two fields: low-RBA and high-SCN. The low-RBA field indicates the point in the redo-log corresponding to the block’s first update after it came into the buffer cache. The high-SCN field indicates the SCN of the last update to the block.
Log sequence number
Block number within log file
Byte offset within block
The structure of the redo block address is given below :
1 - The number of the redo log.
[4 bytes]
2 - The block offset from the beginning of the redo log file.
[4 bytes]
3 - The byte offset within the block.
[2 bytes]
Log sequence number v$logmnr_contents.RBASQN
Block number within log file v$logmnr_contents.RBABLK
Byte offset within block v$logmnr_contents.RBABYTE
So in this case, RBA [0x19.2.10] maps to Log squence 25, Block number 2 with byte offset 16.
With this information you should be able to find the details from v$logmnr_contents.
In particular, the buffer header information includes two fields: low-RBA and high-SCN. The low-RBA field indicates the point in the redo-log corresponding to the block’s first update after it came into the buffer cache. The high-SCN field indicates the SCN of the last update to the block.
*************************************************************************** CHECKPOINT PROGRESS RECORDS *************************************************************************** (size = 8180, compat size = 8180, section max = 11, section in-use = 0, last-recid= 0, old-recno = 0, last-recno = 0) (extent = 1, blkno = 2, numrecs = 11) THREAD #1 - status:0x2 flags:0x0 dirty:47 low cache rba:(0x37a.11c.0) on disk rba:(0x37a.151.0) on disk scn: 0x0000.0045d2f2 12/19/2011 01:03:21 resetlogs scn: 0x0000.00080634 11/07/2011 04:08:50 heartbeat: 770246919 mount id: 2811012380 THREAD #2 - status:0x0 flags:0x0 dirty:0 low cache rba:(0x0.0.0) on disk rba:(0x0.0.0) on disk scn: 0x0000.00000000 01/01/1988 00:00:00 resetlogs scn: 0x0000.00000000 01/01/1988 00:00:00 heartbeat: 0 mount id: 0
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