Counting the many rows of Oracle GoldenGate

******NOTICE******
!The code contained in this post is meant to be  used at your own risk!
******NOTICE****** 

With any Oracle GoldenGate replication configuration, it is always good to monitor what is going on.  One aspect that many people want to know is how can I validate that every record is being transferred to the target system.  Once such way is to use Oracle Veridata; however, some times there is not enough time to setup and run Oracle Veridata.  Also in smaller shops, Oracle Veridata may be a bit costly to initially start with. How can someone get the “warm-and-fuzzy” feeling when replicating data with Oracle GoldenGate?

Oracle GoldenGate has a lot of good command that can be used from the GGSCI prompt to check and see what type of transactions have been processed and the totals of those transactions.  What I was recently tasked with was a way to quickly do a validation of the rows between source and target within a Oracle GoldenGate configuration.  One way to do this is to quickly get a count of the rows per table between the source and target systems.  In discussions with a co-worker, it came out that they had a small utility, primarily scripts, that could do the counts between source and target systems.  In reviewing these scripts I saw where I could possibly improve on the process and make it a bit more streamlined and integrated with the target database.

In streamlining the process I decided to take the main portions of the scripts and rewrite it into a stored procedure that could be use from the Oracle GoldenGate user inside the target database of the replication environment.  The initial stored procedure I came up with can be seen in Code 1 below.

Code 1: Stored procedure for counts


create or replace procedure rowcounts(v_tgtschema in varchar2, v_srcschema in varchar2, v_dblink in varchar2)
is
—Author: Bobby Curtis, Oracle ACE
—Copyright: 20014
—Company: Accenture Enkitec Group
— 
v_tgtcount number(16) := 0;
v_srccount number(16) := 0;
v_sqlstmt0 varchar2(1000);
v_sqlstmt1 varchar2(1000);
v_sqlstmt2 varchar2(1000);
begin
 for vtable
 in (select table_name
     from all_tables
     where owner = v_tgtschema
     order by 1)

loop

v_sqlstmt0 := 'select count(*) from '||v_tgtschema||'.'||vtable.table_name;
 --dbms_output.put_line(v_sqlstmt0);
 execute immediate v_sqlstmt0 into v_tgtcount;

 v_sqlstmt1 := 'select count(*) from '||v_srcschema||'.'||vtable.table_name||'@'||v_dblink;
 --dbms_output.put_line(v_sqlstmt1);
 execute immediate v_sqlstmt1 into v_srccount;

v_sqlstmt2 := 'update onetstats set row_cnt_source='|| v_srccount ||', row_cnt_target=' || v_tgtcount || ', end_time=sysdate where schemaname='''||v_tgtschema||''' and tablename='''||vtable.table_name||''' and dataset=null';
 --dbms_output.put_line(v_sqlstmt2);
 execute immediate v_sqlstmt2;

 if (sql%notfound)
 then
     v_sqlstmt2 := 'insert into onetstats (schemaname,tablename,start_time,end_time,row_cnt_source,row_cnt_target,dataset) values ('''||v_tgtschema||''','''||vtable.table_name||''',sysdate,sysdate,' || v_srccount || ',' || v_tgtcount || ', null)';
    --dbms_output.put_line (v_sqlstmt2);
     execute immediate v_sqlstmt2;
 end if;

 commit;
 end loop;
 exception
       when others
       then
              dbms_output.put_line(sqlerrm);
end;

As you can tell from looking at the stored procedure it uses a table to store the counts for each table in the schema being replicated.  Also notice that a database link is used to access the source server.  The table that stores the count information is just a really simple table with columns that maps to the update/insert statement in the stored procedure.  The database link needs to be configured in the local TNSNames.ora on the target server.  Code 2 and code 3 show an example of these objects.

Code 2: Table for counts


create table &ggate_user..onetstats (
 schemaname varchar2(30),
 tablename varchar2(30),
 start_time date,
 end_time date,
 row_cnt_source number,
 row_cnt_target number,
 dataset number
 )
;

Code 3: Database Link to source


create database link ggcounts connect to &&ggate_user identified by &ggate_user_pwd using 'ggcounts';

The last thing that needed to be done is granting SELECT ON <TABLE> to the Oracle GoldenGate user on the source and target systems.  Once this is done, the stored procedure can be ran from SQL*Plus or SQL Developer at anytime on the target system to get a rough estimate count of the rows between the source and target databases.

Enjoy!!

twitter: @dbasolved

blog: http://dbasolved.com

 ******NOTICE******
!The code contained in this post is meant to be  used at your own risk!
******NOTICE****** 

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