Database link in stored procedure

Question

-- see if sequence is remote
begin
execute immediate 'alter session set global_names = FALSE';
execute immediate 'select count(1) from dba_sequences@'||v_dblink||' where sequence_name = '||''''||a_seq.sequence_name||'''' into v_cnt;
dbms_output.put_line ('v_dblink: '||v_dblink||' Count is '||v_cnt||' on '||a_seq.sequence_name);
if v_cnt > 0 then
-- call update_sequence over dblink
v_dblink := '@'||v_dblink;
dbms_output.put_line ('link is '||v_dblink);
statement := 'begin update_sequence'||v_dblink||'(:1, :2, :3, :4); end;';
dbms_output.put_line (statement);
execute immediate statement using in v_prefix, in v_sequence, in v_column, in v_maxvalue;
else     dbms_output.put_line ('remote sequence does not exist');
end if;
end;
SQL> exec adf.update_sequence;
v_dblink: SEQ_SERV Count is 1 on CM_PHASE1_SEQ
link is @SEQ_SERV
begin update_sequence@SEQ_SERV(:1, :2, :3, :4); end;
BEGIN adf.update_sequence; END;
ERROR at line 1:
ORA-02019: connection description for remote database not found
ORA-06512: at "ADF.UPDATE_SEQUENCE", line 69
ORA-06512: at line 1
ORA-06512: at "ADF.UPDATE_SEQUENCE", line 77
ORA-06512: at line 1
Line 69 is
execute immediate 'select count(1) from dba_sequences@'||v_dblink||' where sequence_name = '||''''||a_seq.sequence_name||'''' into v_cnt;
I am not sure why this error occured.
from the output it doesn't have a problem finding that record over the link.
It is a public database link and I can run sql with no error. but just not inside the procedure.

Answer 1

This worked for me:
IF v_cnt > 0 then
-- call update_sequence over dblink
     v_dblink := '@'||v_dblink;
     statement := 'begin adf.update_sequence'||v_dblink||'(:1, :2, :3); end;';
     dbms_output.put_line (statement);
     execute immediate statement using in v_prefix, in v_sequence, in v_column;     else               
     v_seq := TRUE;
     dbms_output.put_line (' update local sequence');
end if;
database link was created as a user using "connect to" and "identified by clause."