Hi I have attempted to follow the post on changing the database page size from February 2013.

I am using Sybase ASA

Step 1 was to create a fresh database using dbinit - p 8k c:\sqlData\NewData\MyData12.db

Step 2 was to use the dbunload command to copy the existing database to the new one with:

dbunload -c "UID=DBA;PWD=sql;DBN=MyData12;DBF=c:\sqlData\MyData12.db" -ar "UID=DBA;PWD=sql;DBN=MyDataNew;DBF=c:\sqlData\NewData\MyData12.db"

This results in SQL Error: Specified database file already exists.

I have tried using the -ac and -an switch both giving the same error.

What have I missed?

I wish to change the existing database 4k page size to 8k page size keeping the same database name and file. Just as in the orignal post with the -ar option, but I can't seem to get it to work.

asked 17 Feb '15, 22:22

Datagaard's gravatar image

accept rate: 0%

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When you want to reload into an existing database, you cannot use option "-ar" as that creates a new database by design and replaces the old one. Instead you want to use option "-ac" instead.

If you only want to change the pagesize, you could omit the step to create a new database and could then use something like (untested):

dbunload -c "UID=DBA;PWD=sql;DBN=MyData12;DBF=c:\sqlData\MyData12.db" -ap 8k -ar

in one step.

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answered 18 Feb '15, 03:56

Volker%20Barth's gravatar image

Volker Barth
accept rate: 32%

edited 18 Feb '15, 04:08

Hi Volker,

Didn't work, I get the same error "Specified database file already in use". Do I have to stop the database service first?

The answer is yes. I have to stop the database service first. Doh!!

(18 Feb '15, 18:01) Datagaard
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Ah, I see - yes, this is documented behaviour - from the DBUNLOD doc page:

To unload a database, first ensure that the database is not already running. Then, run dbunload, specifying a DBA user and password, and referencing the database with the DBF= connection parameter.

(19 Feb '15, 03:18) Volker Barth


Is each DB as follows?
c:\sqlData\MyData12.db = 4k
c:\sqlData\NewData\MyData12.db = 8k

Please try the following command.

dbunload -c "UID=DBA;PWD=sql;SERVER=MyData12;DBF=c:\sqlData\MyData12.db" -ac "UID=DBA;PWD=sql;SERVER=MyDataNew;DBF=c:\sqlData\NewData\MyData12.db" -xx


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answered 18 Feb '15, 02:53

asa's gravatar image

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question asked: 17 Feb '15, 22:22

question was seen: 806 times

last updated: 19 Feb '15, 03:18