I would start by looking at how many databases, schemas, tables and views are involved. Then look at how many individual Oracle functions need to be converted to plpgsql. You also need to investigate if there are any custom data types. I do not have the formula, but I am sure there is a general time factor involved in converting x databases, y schemas and z tables. You did not mention what hardware is involved, but I am also sure there is a time factor involved in copying / converting data from Oracle to PostgreSQL, and you need to consider how much data you need to move and the order, as there are probably foreign keys involved also.
You might want to do a small test to see how long it takes to dump 10k rows of data from 1 tOracle table and load to PostgreSQL. That will at least give you a general idea of how long it will take to move all data.On Wed, Jul 8, 2015 at 5:20 PM, Joshua D. Drake <jd@xxxxxxxxxxxxxxxxx> wrote:
On 07/08/2015 12:47 PM, John McKown wrote:
Why are they converting?
Would EnterpriseDB (a commercial version of PostgreSQL which has
extensions to make it a "drop in" replacement for Oracle) be a possibility?
http://www.enterprisedb.com/solutions/oracle-compatibility-technology
Because EDB is expensive. Why go from one closed source solution to another when you can go to the best Open Source database and forgo all of that?
Yes, EDB has some nice tools (no denying that) but porting from Oracle to PostgreSQL proper is not difficult in the least (although time consuming).
Sincerely,
JD
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