Обсуждение: pg_toast record in table pg_class

Hi.

I accidentally deleted pg_toast record from pg_class table that belongs to regular table (reltoastrelid).

Now [select * from table_name] not work:
ERROR:  could not open relation with OID [oid_of_pg_toast_table]

Is it possible to restore corruption?


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Regards,
M.Nasedkin

2009/9/24 Mihail Nasedkin <m.nasedkin@gmail.com>:
> Hi.
>
> I accidentally deleted pg_toast record from pg_class table that belongs to
> regular table (reltoastrelid).
>
> Now [select * from table_name] not work:
> ERROR:  could not open relation with OID [oid_of_pg_toast_table]
>
> Is it possible to restore corruption?

Self succecc:

1. select oid, reltoastrelid from pg_catalog.pg_class where
relname='my_corrupt_table';
This is OID(step1) and RELTOASTRELID(step1)

2. pg_ctl stop

3. mkdir temp_data_dir

4. initdb temp_data_dir
pg_ctl start -D  temp_data_dir

5. createdb temp_db


6. create table temp (with same structure of 'my_corrupt_table');

7. select oid, reltoastrelid from pg_catalog.pg_class where relname='temp';
Check:
RELTOASTRELID(step1) - OID(step1) = RELTOASTRELID(step7) - OID(step7)
Equal, OK.

8. drop table temp;

9. again create table temp (...)

10. select oid, reltoastrelid from pg_catalog.pg_class where relname='temp';
Calculate:
(OID(step1)-OID(step10))/(OID(step10)-OID(step7))
This is count of loops create&drop table.N(step10)

11. After N(step10) times create&drop temp table
select oid, reltoastrelid from pg_catalog.pg_class where relname='temp';
Check
OID(step11)=OID(step1) and RELTOASTRELID(step11)=RELTOASTRELID(step1)
Equal, Ok.

12. pg_ctl stop

13. Replace files with names OID(step1) and RELTOASTRELID(step1) in
the  temp_data_dir
with same files from my work_data_dir

14. pg_ctl start -D  temp_data_dir

15. reindex table temp;

16. dump table temp;
17. pg_ctl stop;
18. pg_ctl start -D  work_data_dir
19. restore table temp
.....
.....
.....



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Regards, unsubscribe now
m.nasedkin