Amending system tables when the logical page size changes

If the logical page size changes during migration, you must alter the rs_lastcommit and rs_threads system tables to account for the change.

Follow this procedure for all databases in which the page size has changed.

1. Alter the rs_lastcommit table. Enter:

    declare @pad8_size integer
    declare @alter_cmd varchar(200)
   
    select @pad8_size = (@@maxpagesize / 2)
    - (select sum(A.length) from
    syscolumns A, sysobjects B
    where A.id = B.id
    and B.name = 'rs_lastcommit')
    + (select A.length from
    syscolumns A, sysobjects B
    where A.id = B.id
    and B.name = 'rs_lastcommit'
    and A.name = 'pad8')
   
    select @alter_cmd = "alter table rs_lastcommit "
    + "modify pad8 char("
    + convert(varchar(100), @pad8_size)
    + ")"
    execute (@alter_cmd)
    go
   

2. Alter the rs_threads table. Enter:

    declare @pad4_size integer
    declare @alter_cmd varchar(200)
   
    select @pad4_size = (@@maxpagesize / 2)
    - (select sum(A.length) from
    syscolumns A, sysobjects B
    where A.id = B.id
    and B.name = 'rs_threads')
    + (select A.length from
    syscolumns A, sysobjects B
    where A.id = B.id
    and B.name = 'rs_threads'
    and A.name = 'pad4')
   
    select @alter_cmd = "alter table rs_threads "
    + "modify pad4 char("
    + convert(varchar(100), @pad4_size)
    + ")"
    execute (@alter_cmd)
    go