Section 1- oratop and database/instance specifics

   spid       :oratop's server SPID connected to instance,

   SID        :instance name (First 4 letters), 

   clock      :Time of current stats collected (hh24:mi:ss)

   time       :uptime since this instance startup,

   ins        :Total number of active database instance(s),

   MT         :database total memory (sum Memory_Target),

   ses        :Total user's sessions,

   usr        :Total distinct database foreground (F/G) users,

   %DB      :%database Active, 0 0ndicate idle db

Section 2- Cluster-wide "Top 5 instances activity" ordered by Wait Time 

   ID         :instance id,

   %HC        :Host CPU Utilization, %(busy/busy+idle),

   HLD        :Current Host Load,

   MBPS       :throughput, 'I/O Megabytes per Second',

   %FR        :Shared Pool Free %,

   PGAU       :total PGA inuse,

   IORL       :Avg Synchronous Single-Block Read Latency,

   PQS        :PQ Slave Session Count,

   ASC        :Active Sessions on CPU,

   ASI        :Active Sessions waiting on user i/o,

   ASW        :Active Sessions waiting/sleeping,

   AST        :Total Active Sessions,

   ASB        :Active Sessions blocked,

   AAS        :Average Active Sessions,

   CTPS       :(CPS) User Calls Per Sec, OR,                (TPS) User Transactions Per Sec (appears in RED),

   SSRT       :SQl service Response time,

   DBC        :database cpu time ratio,

   DBW        :database wait time ratio.

Section 3- Cluster-wide "Top 5 Timed Events" ordered by Wait Time 

   EVENT      :database wait event,

   WAITS      :cluster average Total waits,

   TIME(s)    :cluster average Total wait time in seconds),

   AVG_MS     ::cluster Average wait time in milliseconds,

   PCT        :Percent of wait time,

   WAIT_CLASS :Name of the wait class corresponding to the event.

Section 4- Session/process none-idle ordered by Wait Time desc.

   ID         :instance id,

   SID        :session id,

   SPID       :server process os pid,

   USR        :user name (abbreviated),

   PROG       :program name (abbreviated),

   PGA        :process pga used,

   OPN        :OPERATION name, e.g. SELECT,

   SQLID      :SQL identifier if no blocker, else,

   /BLOCKR    :final blocking instance:session:ospid,

   E/T        :Elapsed Time since the session has become active. Units: (s)econds, (M)inutes, (h)our, (d)ay.

   STATUS     :ACTIVE | INACTIVE | KILLED | CACHED | SNIPED,

   STE        :Process STATE: ON CPU or USR I/O or WAITING,

   WAIT_EVENT :process wait event name,

   W/T        :Wait Time. Units: (u)-micro second, (m)illi second, (s)econds, (M)inutes, (h)our, (d)ay.