SQLite

# In-memory database for collecting statistics. This script loops through
# the tables and indices in the database being analyzed, adding a row for each
# to an in-memory database (for which the schema is shown below). It then
# queries the in-memory db to produce the space-analysis report.
#
sqlite3 mem :memory:
set tabledef\
{CREATE TABLE space_used(
   name clob,        -- Name of a table or index in the database file
   tblname clob,     -- Name of associated table
   is_index boolean, -- TRUE if it is an index, false for a table
   nentry int,       -- Number of entries in the BTree
   leaf_entries int, -- Number of leaf entries
   payload int,      -- Total amount of data stored in this table or index
   ovfl_payload int, -- Total amount of data stored on overflow pages

  if {$int_pages>0} {
    statline {Index pages used} $int_pages
  }
  statline {Primary pages used} $leaf_pages
  statline {Overflow pages used} $ovfl_pages
  statline {Total pages used} $total_pages
  if {$int_unused>0} {
    set int_unused_percent \
         [percent $int_unused [expr {$int_pages*$pageSize}] {of index space}]
    statline "Unused bytes on index pages" $int_unused $int_unused_percent
  }
  statline "Unused bytes on primary pages" $leaf_unused \
     [percent $leaf_unused [expr {$leaf_pages*$pageSize}] {of primary space}]
  statline "Unused bytes on overflow pages" $ovfl_unused \
     [percent $ovfl_unused [expr {$ovfl_pages*$pageSize}] {of overflow space}]
  statline "Unused bytes on all pages" $total_unused \
               [percent $total_unused $storage {of all space}]
  return 1
}

# Calculate the overhead in pages caused by auto-vacuum. 
#
# This procedure calculates and returns the number of pages used by the 
# auto-vacuum 'pointer-map'. If the database does not support auto-vacuum,

Page size in bytes

    The number of bytes in a single page of the database file.  
    Usually 1024.

Number of pages in the whole file
}
puts \
"    The number of $pageSize-byte pages that go into forming the complete
    database"
puts \
{
Pages that store data

    The number of pages that store data, either as primary B*Tree pages or
    as overflow pages.  The number at the right is the data pages divided by
    the total number of pages in the file.

Pages on the freelist

#!/usr/bin/awk
#
# Convert input text into a C string
#
{
  gsub(/\\/,"\\\\");
  gsub(/\"/,"\\\"");
  print "\"" $0 "\\n\"";
}