Question : MS SQL 2008 Merge Replication performance

I am currently setting up merge replication for a client and am having performance issues with the initial snapshot.  Here's the setup:

Publisher - Win 2008 64bit, SQL Std 64 bit, 32Gb RAM
Subscribers - 30 shops: XP, SQL Express R2 32 bit, 2GB RAM
The sites are connected to HQ over router to router VPNs running on BT's MPLS network.

I'm trying to publish customer records which exist over 4 tables.  There are approx 1.75m records in total (438,488 per table).  I've generated a snapshot on the server in c:\snapshot with compression which has created a 69mb CAB file.  I then copied this file to the same directory on the subscriber, changed the database recovery model to Bulk Logged and ran the replication.  It took just under 4 hours to run.

This seems like a long time to me so I exported the contents of the tables to txt files and imported using a bulk import BCP command - this took less than 10 minutes.

I've also tried replicating to a similar PC that exists on the same network as the publisher.  This took less that 4 minutes.

Anyone got any idea why replication would take so much longer?
OR
Have any ideas on how to improve performance?
OR
Suggest any other faster ways of setting up the initial snapshot?

Any help would be appreciated.

Answer : MS SQL 2008 Merge Replication performance

simple example with 3 different types

PLS_INTEGER-  fails when the sequence goes above the data type limit  (2^31-1   or 2147483647)

INTEGER and NUMBER both succeed since both of these types have upper limits greater than that of a sequence

a sequence can only go to 9999999999999999999999999999   (28 digits)
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SQL> set serveroutput on
SQL> DROP SEQUENCE testseq1;

Sequence dropped.

SQL> CREATE SEQUENCE testseq1 MINVALUE 0 INCREMENT BY 100000000;

Sequence created.

SQL> DECLARE
  2      v_num PLS_INTEGER := 0;
  3  BEGIN
  4      FOR i IN 1 .. 100
  5      LOOP
  6          SELECT testseq1.NEXTVAL INTO v_num FROM DUAL;
  7
  8          DBMS_OUTPUT.put_line(v_num);
  9      END LOOP;
 10  END;
 11  /
0
100000000
200000000
300000000
400000000
500000000
600000000
700000000
800000000
900000000
1000000000
1100000000
1200000000
1300000000
1400000000
1500000000
1600000000
1700000000
1800000000
1900000000
2000000000
2100000000
DECLARE
*
ERROR at line 1:
ORA-01426: numeric overflow
ORA-06512: at line 6


SQL> DROP SEQUENCE testseq1;

Sequence dropped.

SQL> CREATE SEQUENCE testseq1 MINVALUE 0 INCREMENT BY 100000000;

Sequence created.

SQL> DECLARE
  2      v_num INTEGER := 0;
  3  BEGIN
  4      FOR i IN 1 .. 100
  5      LOOP
  6          SELECT testseq1.NEXTVAL INTO v_num FROM DUAL;
  7
  8          DBMS_OUTPUT.put_line(v_num);
  9      END LOOP;
 10  END;
 11  /
0
100000000
200000000
300000000
400000000
500000000
600000000
700000000
800000000
900000000
1000000000
1100000000
1200000000
1300000000
1400000000
1500000000
1600000000
1700000000
1800000000
1900000000
2000000000
2100000000
2200000000
2300000000
2400000000
2500000000
2600000000
2700000000
2800000000
2900000000
3000000000
3100000000
3200000000
3300000000
3400000000
3500000000
3600000000
3700000000
3800000000
3900000000
4000000000
4100000000
4200000000
4300000000
4400000000
4500000000
4600000000
4700000000
4800000000
4900000000
5000000000
5100000000
5200000000
5300000000
5400000000
5500000000
5600000000
5700000000
5800000000
5900000000
6000000000
6100000000
6200000000
6300000000
6400000000
6500000000
6600000000
6700000000
6800000000
6900000000
7000000000
7100000000
7200000000
7300000000
7400000000
7500000000
7600000000
7700000000
7800000000
7900000000
8000000000
8100000000
8200000000
8300000000
8400000000
8500000000
8600000000
8700000000
8800000000
8900000000
9000000000
9100000000
9200000000
9300000000
9400000000
9500000000
9600000000
9700000000
9800000000
9900000000

PL/SQL procedure successfully completed.

SQL> DROP SEQUENCE testseq1;

Sequence dropped.

SQL> CREATE SEQUENCE testseq1 MINVALUE 0 INCREMENT BY 100000000;

Sequence created.

SQL> DECLARE
  2      v_num NUMBER := 0;
  3  BEGIN
  4      FOR i IN 1 .. 100
  5      LOOP
  6          SELECT testseq1.NEXTVAL INTO v_num FROM DUAL;
  7
  8          DBMS_OUTPUT.put_line(v_num);
  9      END LOOP;
 10  END;
 11  /
0
100000000
200000000
300000000
400000000
500000000
600000000
700000000
800000000
900000000
1000000000
1100000000
1200000000
1300000000
1400000000
1500000000
1600000000
1700000000
1800000000
1900000000
2000000000
2100000000
2200000000
2300000000
2400000000
2500000000
2600000000
2700000000
2800000000
2900000000
3000000000
3100000000
3200000000
3300000000
3400000000
3500000000
3600000000
3700000000
3800000000
3900000000
4000000000
4100000000
4200000000
4300000000
4400000000
4500000000
4600000000
4700000000
4800000000
4900000000
5000000000
5100000000
5200000000
5300000000
5400000000
5500000000
5600000000
5700000000
5800000000
5900000000
6000000000
6100000000
6200000000
6300000000
6400000000
6500000000
6600000000
6700000000
6800000000
6900000000
7000000000
7100000000
7200000000
7300000000
7400000000
7500000000
7600000000
7700000000
7800000000
7900000000
8000000000
8100000000
8200000000
8300000000
8400000000
8500000000
8600000000
8700000000
8800000000
8900000000
9000000000
9100000000
9200000000
9300000000
9400000000
9500000000
9600000000
9700000000
9800000000
9900000000

PL/SQL procedure successfully completed.

SQL>
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