TIP, how to fight with corrupted indexing

[Totte Alm]

tisdagen den 4 februari 2003 kl 10.06 skrev Ruslan Zasukhin:

> on 2/4/03 10:39 AM, Totte Alm at totte at code66.se wrote:
>
> Hi Totte,
>>
>> lördagen den 1 februari 2003 kl 09.21 skrev Ruslan Zasukhin:
>>
>>> For now you can try reduce risk of this, ifyou self add in your prefs
>>> The flag "DbClosed". So on next open you can REINDEX db if it is  
>>> FALSE.
>>
>> This only works for "one db" solutions.
>
> But if to think more?  :-)
>
> If store in X property list
>
>     dbName      Yes
>     dbName2     No
>

Yes, this is a possibility, but kludgy.

> Another hack...you can self write into .vdb header some byte.
> This will work for 1.x versions of course.
>
> Header is 1KB.
> But Valentina use only first hubdreds of bytes.,
> So you can store YOUR flag in to e.g. 500 byte offset.

Might be an option
>
>> My problem is that I use  Valentina DBs as documents. The user can  
>> have
>> hundred or even thousands  databases on their drive, and I've seen  
>> that even
>> with 4-file set, if  teh app crashes before correct database close, it
>> corrupts the index  and when I try to read a Picturedata from the  
>> database, I
>> get garbage  pictureadata back that crashes DrawPicture(). If I  
>> rebuild the
>> index,  it works.
>
> But how index can affect BLOB data?
> I see only one way why it crashes. Record was deleted before crash.  
> Yes?
>
> Totte, may be you need add more Flushes after Updates()?
>

Nope, was NOT deleted, but blobdata was updated. It looks like the  
trashed index points to deleted blobdata, which causes the crash.


>> PS, I have the database for you if you like.
>
> But I need app to debug also,
> Otherwise how I see graphic file? VAPP can not do this.

I know....

// Totte


>
>
> --  
> Best regards,
> Ruslan Zasukhin      [ I feel the need...the need for speed ]
> -------------------------------------------------------------
> e-mail: ruslan at paradigmasoft.com
> web: http://www.paradigmasoft.com
>
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