OPEN SQL (SELECT DATA)

Question

Hi, everybody!
Recent i found a few code but i don't know this mean of code. fllows as.
        SELECT  BMATNR  BWERKS  E~MTARP   AS   MTART
                       CSPART  DMAKTX
                  APPENDING  CORRESPONDING   FIELDS
                               OF   TABLE   LT_PMAT
                      FROM  STPO  AS   A
                        INNER   JOIN   MAST   AS   B
                          ON   BSTLNR   =   ASTLNR
                        INNER   JOIN   MARA   AS   C
                          ON   CMATNR   =   BMATNR
                        INNER   JOIN   MARC   AS   E
                          ON   EMATNR   =   BMATNR
                          AND  EWERKS   =   BWERKS
                        LEFT  OUTER   JOIN  MAKT   AS   D
                          ON   DMATNR   =   BMATNR
                          AND  D~SPRAS   =   C_E
                       FOR   ALL   ENTRIES  IN  LT_CMAT
                      WHERE   A~STLTY   EQ  C_M   "Material Bom
                        AND   A~IDNRK   EQ  LT_CMAT-MATNR
                        AND   B~WERKS   IN  R_WERKS
                        AND   B~STLAN   IN  R_STLAN
                        AND   B~STLAL   IN  R_STLAL
                        %_HINTS ORACLE
                      'LEADING(T_00) USE_NL(T_00 T_01 T_02 T_03 T_04)'.
look bold-face!
I don't know what is "%" and code of last-line !
Please help me!
Thanks Advanced!

Answer 1

%_HINTS ORACLE means you are giving hints/instructions to oracle database, for the sole purpose of database optimization.
The DB optimizer follows certain rules to decided use of index, buffer etc. %_HINTS overrides it by giving specific instruction to oracle.
See OSS Note 129385 for furthur information on using %_HINTS