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Learn Golden Gate with the Concept of Primary Key:
It supports tables with and without any primary key. But if you are replicating or making copy of tables that donot have a primary key, then there are some vital factors you need to consider.
Take a sample table, created as follows:
create table sizetest (idno number, data1 varchar2(50), data2 varchar(4000), data3 varchar2(50), data4 varchar2(30));
alter table sizetest add constraint pk_sizetest primary key (idno);
This table maybe overemphasis the problem; because it has several number of character columns (here data1, data2, data3 and data4) but this is often the case with the real world data.
Consider this one:
create sequence seqsizetest;
for counter in 1..20000
insert into sizetest values (
Here the table ends up being with 560MB in size, and the size of the primary key is 4MB.
How is the performance on the target database:
Another anxiety is – how the data is applied on target. Our non-Primary Key source updatequitted quickly. This was a set based operation operated on the top 1000 rows of the table and then just took a second or two seconds to run. On the target yet, it will be a different difficulty entirely.
This replication is going to run 1000 discrete update statements.