Originally posted on Oracle Scratchpad:

Here’s a little puzzle if you have nothing better to do between now and the new year. The following extract came from 11.2.0.3, but could have come from 10.2.0.5 or 9.2.0.8 (and many others). I’ve got a simple heap table where the last thing I (or anyone) did was “alter table t1 move” before dumping the first (data) block of the table. Looking at the resulting trace file, I see the following:

1

If you need to have the acronyms decoded they are (according to my best guess):

  • fsbo – free space, begin offset
  • fseo – free space, end offset
  • avsp – available space
  • tosp – total space

Doing the arithmetic, the free space starts at offset 0x56e and ends at 0xf4d, which means the free space gap is 2,527 bytes; but the total space available for use is only 0x5f bytes, i.e. 95 bytes. So…

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