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odbc fixes

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gmdb commit
documentation updates
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brianb
2002-04-09 01:18:16 +00:00
parent e2c3a9d818
commit f20560d1f1
16 changed files with 3068 additions and 1127 deletions
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8
HACKING
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@@ -52,9 +52,11 @@ The second byte is always 0x01 as far as I can tell.
At some point in the file the page layout is apparently abandoned though the
very last 2K in the file again looks like a valid page. The purpose of this
non-paged region is so far unknown. Could be a corrupt db as well. My current thinking is that this area is unallocated pages based on the GAM (global allocation map stored on page 0x01).
non-paged region is so far unknown. Could be a corrupt db as well. My current
thinking is that this area is unallocated pages based on the GAM (global
allocation map stored on page 0x01).
Bytes after the first and second seemed to depend on the type of page, although bytes 4-7 seem to indicate a page type of some sort. 02 00 00 00 is found on all catalog pages.
Bytes after the first and second seemed to depend on the type of page, although bytes 4-7 are pages pointers that refer to the parent (data pages) or a continuation page (table definition).
Pages seem to have two parts, a header and a data portion. The header starts
at the front of the page and builds up. The data is packed to the end of the
@@ -145,7 +147,7 @@ The header of each Tdef page looks like this (8 bytes) :
| 0x00 | 4 bytes | next_pg | Next tdef page pointer (0 if none) |
+------+---------+-------------+------------------------------------------+
Note: The tabledef is very long, so it can take many TDEF pages linked
Note: The tabledef can be very long, so it can take many TDEF pages linked
with the next_pg pointer.
+-------------------------------------------------------------------------+