Oracle stream - first_scn and start_scn

Question

Hi,
My first_scn is 7669917207423 and start_scn is 7669991182403 in DBA_CAPTURE view.
Once I will start the capture from which SCN it will start to capture from archive log?
Regards,

Answer 1

I am using oracle 10.2.0.4 version oracle streams. It's Oracle downstream setup. The capture as well as apply is running on target database.
Regards,
Below is the setup doc.
1.1 Create the Streams Queue
conn STRMADMIN
BEGIN
DBMS_STREAMS_ADM.SET_UP_QUEUE(
queue_table => 'NIG_Q_TABLE',
queue_name => 'NIG_Q',
queue_user => 'STRMADMIN');     
END;
1.2 Create apply process for the Schema
BEGIN
DBMS_APPLY_ADM.CREATE_APPLY(
queue_name => 'NIG_Q',
apply_name => 'NIG_APPLY',
apply_captured => TRUE
END;
1.3 Setting up parameters for Apply
exec dbms_apply_adm.set_parameter('NIG_APPLY' ,'disable_on_error','n');
exec dbms_apply_adm.set_parameter('NIG_APPLY' ,'parallelism','6');
exec dbms_apply_adm.set_parameter('NIG_APPLY' ,'_dynamic_stmts','Y');
exec dbms_apply_adm.set_parameter('NIG_APPLY' ,'_hash_table_size','1000000');
exec dbms_apply_adm.set_parameter('NIG_APPLY' ,'_TXN_BUFFER_SIZE',10);
/********** STEP 2.- Downstream capture process *****************/
2.1 Create the downstream capture process
BEGIN
DBMS_CAPTURE_ADM.CREATE_CAPTURE (
queue_name => 'NIG_Q',
capture_name => 'NIG_CAPTURE',
rule_set_name => null,
start_scn => null,
source_database => 'PNID.LOUDCLOUD.COM',
use_database_link => true,
first_scn => null,
logfile_assignment => 'IMPLICIT');
END;
2.2 Setting up parameters for Capture
exec DBMS_CAPTURE_ADM.ALTER_CAPTURE (capture_name=>'NIG_CAPTURE',checkpoint_retention_time=> 2);
exec DBMS_CAPTURE_ADM.SET_PARAMETER ('NIG_CAPTURE','_SGA_SIZE','250');
2.3 Add the table level rule for capture
BEGIN
DBMS_STREAMS_ADM.ADD_TABLE_RULES(
table_name => 'NIG.BUILD_VIEWS',
streams_type => 'CAPTURE',
streams_name => 'NIG_CAPTURE',
queue_name => 'STRMADMIN.NIG_Q',
include_dml => true,
include_ddl => true,
source_database => 'PNID.LOUDCLOUD.COM'
END;
/**** Step 3 : Initializing SCN on Downstream database—start from here *************/
import
=================
impdp system DIRECTORY=DBA_WORK_DIRECTORY DUMPFILE=nig_part1_srm_expdp_%U.dmp table_exists_action=replace exclude=grant,statistics,ref_constraint logfile=NIG1.log status=300
/********** STEP 4.- Start the Apply process ********************/
sqlplus STRMADMIN
exec DBMS_APPLY_ADM.START_APPLY(apply_name => 'NIG_APPLY');