  servers working together.  Because there is no single solution
  that eliminates the impact of the sync problem for all use cases,
  there are multiple solutions.  Each solution addresses this
  problem in a different way, and minimizes its impact for a specific
  workload.
 </P
><P
>  Some solutions deal with synchronization by allowing only one
  server to modify the data.  Servers that can modify data are
  called read/write, <I
CLASS="FIRSTTERM"
>master</I
> or <I
CLASS="FIRSTTERM"
>primary</I
> serve