I have total 64 Gig for, out of which we allocated 40gig for oracle SGA keeping below points, can yo

DB total we have 64GB, we have allocated 40GB for DB, hugepage setting has done. However when you check the usage it shows free memory zero.

18:19:54 # free -g

total used free shared buffers cached

SQL> show sga

Total System Global Area 4.0354E+10 bytes

Fixed Size 2273928 bytes

Variable Size 5905583480 bytes

Database Buffers 3.4427E+10 bytes

Redo Buffers 18984960 bytes

SQL> SELECT * FROM v$sga;

NAME VALUE

-------------------- ----------

Fixed Size 2273928

Variable Size 5905583480

Database Buffers 3.4427E+10

Redo Buffers 18984960

SQL> select * from v$sgainfo;

NAME BYTES RES

-------------------------------- ---------- ---

Fixed SGA Size 2273928 No

Redo Buffers 18984960 No

Buffer Cache Size 3.4427E+10 Yes

Shared Pool Size 5368709120 Yes