Materialized View - "use log" and its "master table" assigned

Oracle 10 g R2. Here is my script to create a mv, but I noticed two interestes properties by EM
CREATE MATERIALIZED VIEW "BAANDB"."R2_MV"
TABLESPACE "USERS" NOLOGGING STORAGE ( INITIAL 128K) USING INDEX
TABLESPACE "BAANIDX" STORAGE ( INITIAL 256K)
REFRESH FORCE ON COMMIT
ENABLE QUERY REWRITE AS
SELECT CM.ROWID c_rid, PC.ROWID p_rid, CM."T$CWOC", CM."T$EMNO", CM."T$NAMA", CM."T$EDTE", PC."T$PERI", PC."T$QUAN", PC."T$YEAR", PC."T$RGDT"
FROM "TTPPPC235201" PC , "TTCCOM001201" CM
WHERE PC."T$EMNO"(+)=CM."T$EMNO"
In EM, the MV list shows a column - "Can Use Log".
1. What does it mean?
2. Why it only says yes, when I used above codes to create the MV; but says "NO" when I created the MV by "OUT JOIN"? no matter is "LEFT.." or "RIGHT JOIN"
3. I also noticed that there is a column - "master table" and it always shows the name of the last table on the from list. Why? More important, does it matter to process. It shows the same table name when I use the "OUT JOIN" clause in from
I have created mv log on each master table with row_id.

Review the rules for your version of Oracle, you didn't think it important to name it, with respect to when you can do FAST REFRESH and when it can use REFRESH LOGs.

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