** adv replication

Hi,
 In case of table change alter table like add a column : for a table in adv 
replication : a quiesce of replication is needed and then a generate support. 
Now, in case of alter table like increase a field length  : is it necessary to 
quiesce and the generate support after alter table? I think or varchar2 
increase of field length it is not necessary and it can be done on the fly like 
it can be done for a table not in replication. The data seems to flow with the 
new field length. Now, is there any catch or is it safe to do or any condition 
for this like limited to data type. Does anyone have experience doing this. 
Thanks 


       
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