I understand more schema's is difficult to maintain. Are there any limitation on number of schema's in Oracle 11g RAC? Supporting old application with 250 schema's per DB. I was told more than 250 schema's will cause some SQLLIB error from Oracle. Anyone worked/faced issues with around 250 schema's ? BTW our new application modified to handle in single schema. Karth Sent from my IPhone > On Aug 7, 2014, at 5:04 AM, Niall Litchfield <niall.litchfield@xxxxxxxxx> > wrote: > > That's a fair question, Patrice's original question arose in the context of > the SQL Developer diff tool for comparing schemas in 2 different databases. > In that context I considered an empty schema to count towards the number of > schemas in a db since you definitely want to know if it is empty in db A but > populated in db B. However it did seem likely to me that most people would go > with your definition - hence Q2. > > As I'm away for a bit now, and we have 60 responses, the results so far (DB > account = any user, schema = user owning objects) are below. So the anecdotal > evidence from this list is that it is unusual, but hardly unheard of, to have > > 100 users owning database objects. If anyone missed Jeff's later reply on > the other thread the DBDiff feature of SQL*Developer isn't really intended to > be used at that sort of scale. > > Total DB accounts > > 0-10 15.00% > 10-100 40.00% > 100-500 28.33% > 500-1000 10.00% > 1000-5000 1.67% > 5000+ 5.00% > > > Total Schemas > > 0-10 31.67% > 10-100 45.00% > 100-500 18.33% > 500-1000 3.33% > 1000+ 1.67% > > Niall > <pedantry> > I'd go with schema as being a set of objects in a single namespace and of > course would say that that must logically include the empty set :) > </pedantry> > > > >> On Thu, Aug 7, 2014 at 8:58 AM, William Robertson >> <william@xxxxxxxxxxxxxxxxxxxx> wrote: >> How are we defining "schema"? To me it's a collection of database objects >> owned by a single account (or equivalent namespace), so I was a bit puzzled >> by the two-part question. A user that owns no objects (such as a read-only >> production account) is not a schema, surely. >> >> William Robertson >> >> >> On 5 Aug 2014, at 14:35, Niall Litchfield <niall.litchfield@xxxxxxxxx> wrote: >> >> All >> >> For those not following the dbdiff thread I've created a 2 question survey >> at https://www.surveymonkey.com/s/VGKZMY5 to get some statistics on how many >> different schemas databases in the wild actually contain. If we get more >> than, say, 50 responses I'll post back the answers here. >> >> -- >> Niall Litchfield >> Oracle DBA >> http://www.orawin.info > > > > -- > Niall Litchfield > Oracle DBA > http://www.orawin.info