what u means by "sysengines contains one row for each Adaptive Server engine currently online." if I have multiple instance of sybase will that measn I can see it at any instances available in the server ?
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sysengines table in sybase
Hi,
what is actually this table reported ?
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by: Deepak_FILPosted on 2009-10-29 at 02:13:01ID: 25691703
Hi,
sysengines contains one row for each Adaptive Server engine currently online.
you can query the sysengines table to find the starttime of the oldest engine.
==============
Each ASE server running on the machine will have at least one OS process, the dataserver binary, and may have many such running. A single server instance consists of at least one dataserver process. Under Sybase terminology, such dataserver processes that are cooperating and communicating with each other in shared memory are known as engines. For production use, one CPU on the server machine is often reserved as dedicated to host each Sybase engine. The engine may then be configured to hog this CPU, even when there is no active work it will idle loop polling for new incoming client connections to avoid context switches. Of course, this behaviour is entirely configurable and running one or more server instances on a single-CPU machine is not a problem - depending of course upon the load on these servers. As long as there is sufficient memory for each instance and they are started on different TCP ports, there is no problem having several instances on one machine - even of different versions.
A simple ps will show you the dataserver processes (by default you only have one), Sybase has provided a utility named showserver that will just show you the Sybase-related processes that are active. The sp_sysmon stored procedure will monitor ASE for a given time interval, then dump out several pages of global performance data. The Engine section shows how active the server really is, regardless of the CPU usage shown on OS level.
===============
also note that:
1) select * from master..sysengines
2) at the UNIX prompt, use the ps -ef command to list all running processes. Note the dataserver
processes, each is an engine.
How to start/stop an engine?
-- start engine #4
sp_engine 'online',4
go
-- stop engine #4
sp_engine 'offline',4
go