Sql statemet takes huge amout of resource !

Friends ,
I am using Oracle 10g (10.2.0.1) database in AIX 5.3 server . Last few days I observe that some sql ( 2 statements ) query takes a high resource . And sometimes when a user generate that particular sql statement , then it takes a huge time to execute .
I think , sql stqtement needs to be tuned . But the question is , these statement runs from the last 1 year and i dont get any resource related error during this period . I dont understand the reason why this statement now takes huge resource .
In this moment , would anybody plz advice me , which area I need to check to find out the exact problem ?
In below I paste the one of sql statement :
SELECT gldtdate,SA.glid,SA.glparentid,SA.gldescription,SA.glcode,SA.glmapcode, SA.gllevel,SUBSTR(glcode,:"SYS_B_00",:"SYS_B_01") AS gltype, NVL(SUM(CASE WHEN GLDTTYPE = :"SYS_B_02" THEN GLDTDEBIT ELSE :"SYS_B_03" END),:"SYS_B_04") CAD, NVL(SUM(CASE WHEN GLDTTYPE = :"SYS_B_05" THEN GLDTDEBIT ELSE :"SYS_B_06" END),:"SYS_B_07") CLD, NVL(SUM(CASE WHEN GLDTTYPE = :"SYS_B_08" THEN GLDTDEBIT ELSE :"SYS_B_09" END),:"SYS_B_10") TRD, NVL(SUM(CASE WHEN GLDTTYPE IN (:"SYS_B_11",:"SYS_B_12", :"SYS_B_13") THEN :"SYS_B_14" ELSE :"SYS_B_15" END),:"SYS_B_16") VD, NVL(SUM(CASE WHEN GLDTTYPE = :"SYS_B_17" THEN GLDTCREDIT ELSE :"SYS_B_18" END),:"SYS_B_19") CAC, NVL(SUM(CASE WHEN GLDTTYPE = :"SYS_B_20" THEN GLDTCREDIT ELSE :"SYS_B_21" END),:"SYS_B_22") CLC, NVL(SUM(CASE WHEN GLDTTYPE = :"SYS_B_23" THEN GLDTCREDIT ELSE :"SYS_B_24" END),:"SYS_B_25") TRC, NVL(SUM(CASE WHEN GLDTTYPE IN (:"SYS_B_26",:"SYS_B_27", :"SYS_B_28") THEN :"SYS_B_29" ELSE :"SYS_B_30" END),:"SYS_B_31") VC, NVL(SUM(CASE WHEN GLDTTYPE = :"SYS_B_32" THEN :"SYS_B_33" ELSE :"SYS_B_34" END),:"SYS_B_35") CACV, NVL(SUM(CASE WHEN GLDTTYPE = :"SYS_B_36" THEN :"SYS_B_37" ELSE :"SYS_B_38" END),:"SYS_B_39") CADV FROM GLACCOUNT sa, VW_USER_ALL_TXN WHERE sa.glid = gldtglid AND GLDTDATE =TO_DATE(:"SYS_B_40",:"SYS_B_41") AND UPPER(MC_User)=:"SYS_B_42" AND GLDTBRANCHID =:"SYS_B_43" GROUP BY gldtdate,SA.glid,SA.glparentid,SA.gldescription,SA.glcode,SA.glmapcode,SA.gllevel ORDER BY SUBSTR(SA.GLCODE,:"SYS_B_44",:"SYS_B_45")DESC,SA.glmapcode

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