aq_tm_processes=4
     This parameters is needed to start the queues monitor processes. It is also responsible for the number of
     apply execution server that purges the queue for applied events. Setting it to 4 for 1 queues doubles the speed
     of apply due to the faster cleanout of applied events.    

SHARED_POOL_SIZE
     Amount of  memory available for logminer processing is take out of shared_pool_size. The default amount of
     shared_pool memory allocated to logminer is 10Mb. Increase this value especially in environment
     where large LOBs are process. Stream will use by default, 10% of the shared_pool_size. When the 10% are used
     by the buffers queues, then spillover start to occurs Use _first_spare_parameter to increase
    the % of shared_pool allocate to streams.

Logmnr_max_persistent_session=1
     You need at least one of this. You neeed to have at least one logminer per server capture process.
     If you set multiple capture processes, you will have multiple logminer session, so you will need
     to increase this parameters to match the number of capture process.
     Do not mix 'capture process' with sever capture server. These last and are defined with
     DBMS_CAPTURE_ADM.SET_PARAMETER(parallelism=> nn) and can be up to 3 * cpu

_first_spare_parameter=50
     This parameter allocate percentage of the SGA for the streams processes. 
     The default is 10% of your SGA

_job_queue_interval=1
     Setting this to one overwrite the default setting of 5 secondes at which the queues are scanned by job.
     There is no reason to wait 5 seconds to realize new event arrived.

PARALLEL_MAX_SERVERS=(> apply or capture processes)
     Each capture process and apply process may use multiple parallel execution servers. The apply
     process by default needs two parallel servers.  So this parameter needs to set to at least 2 even 
     for a single non-parallel apply process. Specify a value for this parameter to ensure that there are enough 
     parallel execution servers. In our installation we went for 12 apply server, so we increased
     the number of parallel_max_server above this figure of 12.

_kghdsidx_count=1 	
     This parameter prevents the shared_pool from being divided among CPUs

LOG_PARALLELISM=1
     This parameter must be set to 1 at each database that captures events.

     There may be only one logminer session for the whole ruleset and only one enqueuer process that will push the
     objects. you can safely define as much as 3 execution capture process
     per CPU

     Increase the frequency of logminer checkpoints especially in a database with significant LOB or DDL
     activity. A logminer checkpoint is requested by default every 10Mb of redo mined.

     Amount of memory available from the shared pool for logminer processing. The default amount of shared_pool memory
     allocated to logminer is 10Mb. Increase this value especially in environments where large LOBs are processed.