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Re: Need Help Restoring Old Backup

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On 12/15/2013 11:00 AM, Steve Knott wrote:
Hi,

I have a really old database (5+ years old) that was backed up stored
away for a while.  Now I want some data out of it.

Not sure what you mean here? Do you mean you stored the database data directory or did a dump and stored that?


I originally thought that if I made a backup and kept around the
original database install.exe file, I could reinstall the db & restore
the data.  It looks like that is not happening.  The old database was
somewhere in 8.2.x before it was shut down.

Whenever I try to restore, I get:
 > pg_restore: [archiver (db)] Error while PROCESSING TOC:
 > pg_restore: [archiver (db)] Error from TOC entry 1490: 1259 26787
TABLE users client
 > ...
 > pg_restore: [custom archiver] found unexpected block ID (1257691431)
when reading data -- expected 2049

So here you are using an old dump file produced with -Fc switch?

What version of pg_restore are you using?

A dump/restore should work across architectures, but for troubleshooting purposes have you changed machines?


I tried restoring on an 8.2, 8.4 and 9.0, but each fail with similar
error messages.

How similar, the same table, the same unexpected block id message, or other?



Is there anyway to repair this file or break it up some I can get most
of the data out of it?  It appears to be stopping half way through.  If
I could get it past this point, I could at least reclaim the tables
after this issue.


Well you could use the below to selectively dump items.

http://www.postgresql.org/docs/9.3/interactive/app-pgrestore.html

-l
--list

List the contents of the archive. The output of this operation can be used as input to the -L option. Note that if filtering switches such as -n or -t are used with -l, they will restrict the items listed.

-L list-file
--use-list=list-file

Restore only those archive elements that are listed in list-file, and restore them in the order they appear in the file. Note that if filtering switches such as -n or -t are used with -L, they will further restrict the items restored.

list-file is normally created by editing the output of a previous -l operation. Lines can be moved or removed, and can also be commented out by placing a semicolon (;) at the start of the line. See below for examples.



Thanks for any help,
Steve



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Adrian Klaver
adrian.klaver@xxxxxxxxx


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