Things to consider while merging two DBs?

Dear gurus,
We have 2 instances, 1 is prod and other is replica of prod, just 4-5 hours behind prod,
used for queries just to reduce overhead on PROD,(the second instance is not a DSS/warehosuese/OLAP env it is just replica on instance 1) with some additional indexes,
now the management has decided to remove the second instance,
my question is : how do i proceed that the queries running on instance 2 should not create any problem when shifted to instance 1
thanks

user548749 wrote:
my question is : how do i proceed that the queries running on instance 2 should not create any problem when shifted to instance 1If an existing query on instance 2 uses an index which is not available on instance 1, there can be a hefty performance impact. Or instance 1 can already be quite busy and unable to handle the additional volume of queries from instance 2. Or the buffer cache on instance 1 may not allow the same level of caching enjoyed by queries on instance 2 (due to production processes that are absent from instance 2).
So there is no simple way to identify problematic queries that worked fine on instance 2 and would be a problem on instance 1. For starters, you will need to parse every single query on both and compare the resulting execution plans simply to determine if there will be a difference.
Also, as instance 1 contains more data than instance 2 (which lags some hours behind), execution plans can quite likely be different in some cases due to the volume of data.
This is not a simple exercise to undertake. There will be execution plan differences - and the difference may not be a bad thing due to the differences of instance 1 compared with instance 2.
What you can do is implement resource profiles on instance 1 for instance 2 queries - and that way attempt to control those queries resource utilisation and thus minimise their impact on instance 1.
Bottom line though - I see this as a lot of manual and hard work to make the replacement of instance 2 with instance 1 a transparent one to the end users that are using instance 2 for queries.
Billy

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