Running Instances in SOA EM

Hi,
I want to understand if we have lot of running instances in SOA , what is the impact of it.
As far as I know that running instances means that
1: Running instances are in dehydrated state. They should not consume systems memory continuously to make the system slow.
2: Running instances will consume space in the database as they are nothing but a process under execution.
If above two points are correct then, Please help me in below query,
If we have too many running instances in the system say due to some non recoverable fault(other system is down) in target system and source system is sending transactional data
regularly,
Will my soa infra tablespace be filled with the same rate by which it is filled when SOA saves a completed instance ?
Thanks,
Ashutosh

Ashutosh,
I want to understand if we have lot of running instances in SOA , what is the impact of it.Depends on many factors. Depends on why are they stuck in running state, how old are they and how many of them. Also depends on server's capacity as well as DB's capacity.
1: Running instances are in dehydrated state. They should not consume systems memory continuously to make the system slow.It's not true always. Only if a process encounters the dehydration activity then only instances are dehydrated.
2: Running instances will consume space in the database as they are nothing but a process under execution. Running instances which are having large number of retries and are failing continuously may cause severe performance issue as load increases rapidly on DB and on server both. Remember that for each fault, data will be written in DB as well as in logs (which will consume CPU and memory both).
Will my soa infra tablespace be filled with the same rate by which it is filled when SOA saves a completed instance ?No, because additional data about faults will also get stored in DB along with the other details of instance (which are stored in case of normal completion). Moreover if retries are enabled and one instance is failing multiple times then issue may become severe as it will impact both SOA server and DB.
Remember that by default "RUNNING" instances are not purged so if you are having too old and too many running instances then even regular purge may not help in reducing the size of SOA INFRA tablespace and in that case, SQL queries may also start performing poorly which will eventually impact the SOA server(s).
So it's not a good idea to have too many running instances for a too long time specially in high load messaging systems.
Regards,
Anuj

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Running Instances in SOA EM

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