Consolidation of DB - Cost Cutting

Dear members,
I'm new to this forum. We have several servers classified as development, Test and Production in which several databases are executed in each of them. Can anyone suggest me how to proceed with the consolidation of oracle database in the server group. I have an idea little lit up like
patterns in several databases can be grouped into a single oracle database.

But how calculate efficiency as, a particular database have not been used for the last 2 months... etc so that it can be used as a factor of consolidation.

If I'm not mistaken, the size of each scheme can be determined in dba_segments selection owner and sum column (bytes).

Please let me know what might be other issues to look out here in the consolidation.

Kind regards
Mani
TCS

First of all, you must understand what databases are candidates for consolidation. For example
-Your databases do support packaged applications with specific requirements for the version parameters and/or database initialization? If so, these databases must usually be retained separately.
-L' one of your databases have other reasons to run a different Oracle that everyone else version (additional construction or different and cycles, different points on the life cycle, etc.)?
-Your data have the same availability requirements? If not, it can get very difficult (and therefore expensive) to coordinate downtime if you consolidate the databases that have needs different downtime.
-What's your approach to the consolidation of the support of the permissions? If you regularly give users (particularly in environments below) powerful privileges (i.e. SELECT ANY TABLE) knowing that the data in this particular database is a relatively low risk, consolidate with a database that contains payroll information is probably a bad idea.
-Your applications use public synonyms? If so, these synonyms would be in line with consolidation?

Second, what is the efficiency as you try to win? If a particular database has not been used in 2 months, why is - it? Assuming it will be reused, really saving you much if you consolidate with another database on the same server? You can decrease the RAM required on the server, but it is often the least expensive component to add. If you can consolidate enough bases to start to get rid of servers, which can begin to be a reduction of costs (especially where you have CPU based licenses).

Assuming that you have a level of oversight in place, either at the level of the OS or Oracle via statspack / AWR, you can usually get an idea of the average and which are placed on a system to see what you can gain by consolidating the peak loads. But you need determine how correlated is the use of various databases - if takes the data base to 100% of the CPU and database B takes 100% of CPU, you might be well consolidate if one runs almost exclusively during the night and B works almost exclusively during the day. On the other hand, if you have databases with vertices coincide (i.e. the activity in a single system implies that it is likely to be activity in another), you can get very little consolidation and can end up creating new bottlenecks if everyone is fighting on the CPU during a peak. And you will need to know how much you should allocate slack (for example, some applications may spec on the server of database planning for a few years worth of growth - you will need to have access to these projections to determine whether the database that only takes 10% of the CPU will double or triple in size in the next few years).

Justin

Tags: Database

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