Doubt Regarding Table Accessed via DB Link

Question

I have the following SQL:
select * from tab1@db_link tab1, tab2
where tab1.col1=tab2.col2
and tab1.col2=99;
Can I ensure that Oracle brings data corresponding to:
select * from tab1@db_link tab1
where tab1=99;
and then joins the data with tab2.
What could be fastest way to access data in this manner? Basically i need to tune a similar query.

Answer 1

No not much difference. On both the cases oracle goes for the same plan. Here is a small test case
select t.*
  from t@to_inlabnew t, t1
where t.object_id = t1.object_id
   and t.object_type = 'TABLE'
call     count       cpu    elapsed       disk      query    current        rows
Parse        1      0.03       0.16          0          0          1           0
Execute      1      0.00       0.00          0          0          0           0
Fetch      171      1.09       1.68          0          6          0        2544
total      173      1.12       1.84          0          6          1        2544
Rows     Execution Plan
      0  SELECT STATEMENT   GOAL: ALL_ROWS
   2544   HASH JOIN
   1000    INDEX   GOAL: ANALYZED (FAST FULL SCAN) OF 'T1_IDX' (INDEX)
199792    REMOTE OF 'T' (REMOTE)
               [TO_INLABNEW.REGRESS.RDBMS.DEV.US.ORACLE.COM]
              SELECT "OWNER","OBJECT_NAME","SUBOBJECT_NAME","OBJECT_ID",
              "DATA_OBJECT_ID","OBJECT_TYPE","CREATED","LAST_DDL_TIME",
              "TIMESTAMP","STATUS","TEMPORARY","GENERATED","SECONDARY" FROM
                "T" "T" WHERE "OBJECT_TYPE"='TABLE'
select t.*
  from (select * from t@to_inlabnew where object_type = 'TABLE') t, t1
where t.object_id = t1.object_id
call     count       cpu    elapsed       disk      query    current        rows
Parse        1      0.00       0.00          0          0          0           0
Execute      1      0.00       0.00          0          0          0           0
Fetch      171      1.09       1.46          0          6          0        2544
total      173      1.09       1.46          0          6          0        2544
Rows     Execution Plan
      0  SELECT STATEMENT   GOAL: ALL_ROWS
   2544   HASH JOIN
   1000    INDEX   GOAL: ANALYZED (FAST FULL SCAN) OF 'T1_IDX' (INDEX)
199792    REMOTE OF 'T' (REMOTE)
               [TO_INLABNEW.REGRESS.RDBMS.DEV.US.ORACLE.COM]
              SELECT "OWNER","OBJECT_NAME","SUBOBJECT_NAME","OBJECT_ID",
              "DATA_OBJECT_ID","OBJECT_TYPE","CREATED","LAST_DDL_TIME",
              "TIMESTAMP","STATUS","TEMPORARY","GENERATED","SECONDARY" FROM
                "T" "T" WHERE "OBJECT_TYPE"='TABLE'