TIP # 64 : How to determine bind variable value and type from trace file.

In TIP 48 , I explained on how to make more sense of trace which is generated by event 10046.
One of our reader asked a question on how to identify data type of bind variable, As the result I dedicated this post to answer.

For finding more information about bind variable, user should be able to locate BINDS keyword in trace file.
This part is something like this :

BINDS #2:
bind 0: dty=1 mxl=32(30) mal=00 scl=00 pre=00 oacflg=13 oacfl2=1 size=32 offset=0
bfp=030a79ec bln=32 avl=01 flg=05
value="A"

dty determines bind variable type and value shows bind variable value at the time of execution.
Different values can be assigned to dty which presents different data type.


Typical dty value is :

1 VARCHAR2 or NVARCHAR2
2 NUMBER
8 LONG
11 ROWID
12 DATE
23 RAW
24 LONG RAW
96 CHAR
112 CLOB or NCLOB
113 BLOB
114 BFILE


To demosnstrate, I ran some queries.

------ Query #1 : Number Bind variable


SQL> alter session set statistics_level=ALL;

Session altered.

SQL> alter session set max_dump_file_size=UNLIMITED;

Session altered.

SQL> alter session set events '10046 trace name context forever, level 12';

Session altered.

SQL> variable b number;
SQL> declare
2 cnt number;
3 begin
4 :b:=1;
5 select count(*) into cnt from dba_objects where object_id=:b;
6 end;
7 /

PL/SQL procedure successfully completed.

SQL> alter session set events '10046 trace name context off';

Session altered.


Checking trace file ......


PARSING IN CURSOR #2 len=52 dep=1 uid=0 oct=3 lid=0 tim=2797155817 hv=1220784193 ad='130a9d4c'
SELECT count(*) from dba_objects where object_id=:b1
END OF STMT
PARSE #2:c=15625,e=24270,p=0,cr=5,cu=0,mis=1,r=0,dep=1,og=0,tim=2797155809
BINDS #2:
bind 0: dty=2 mxl=22(22) mal=00 scl=00 pre=00 oacflg=13 oacfl2=1 size=24 offset=0
bfp=030a7b2c bln=22 avl=02 flg=05
value=1
EXEC #2:c=0,e=2062,p=0,cr=0,cu=0,mis=0,r=0,dep=1,og=4,tim=2797159524
FETCH #2:c=0,e=37,p=0,cr=3,cu=0,mis=0,r=1,dep=1,og=4,tim=2797159885



------ Query #2 : Varhchar2 Bind variable


SQL> alter session set events '10046 trace name context forever, level 12';

Session altered.

SQL> variable b varchar2(30);
SQL> declare
2 cnt number;
3 begin
4 :b:='A';
5 select count(*) into cnt from dba_objects where object_name=:b;
6 end;
7 /

PL/SQL procedure successfully completed.

SQL> alter session set events '10046 trace name context off';



Checking trace file .....



PARSING IN CURSOR #2 len=54 dep=1 uid=0 oct=3 lid=0 tim=3007778755 hv=2029951970 ad='12ff2c80'
SELECT count(*) from dba_objects where object_name=:b1
END OF STMT
PARSE #2:c=15625,e=12991,p=0,cr=2,cu=0,mis=1,r=0,dep=1,og=0,tim=3007778748
BINDS #2:
bind 0: dty=1 mxl=32(30) mal=00 scl=00 pre=00 oacflg=13 oacfl2=1 size=32 offset=0
bfp=030a79ec bln=32 avl=01 flg=05
value="A"
EXEC #2:c=0,e=2167,p=0,cr=0,cu=0,mis=0,r=0,dep=1,og=4,tim=3007782524
WAIT #2: nam='db file sequential read' ela= 9458 p1=1 p2=89 p3=1
WAIT #2: nam='db file sequential read' ela= 6606 p1=1 p2=26791 p3=1