event 10046 – tracing sessions

how to trace session by
– alter session
– oradebug
– logon trigger

tracefiles will be placed in user_dump_dest (10g) or in diag_dest/db/inst/trace (11g)

Session Tracing

alter session set max_dump_file_size = unlimited;
alter session set tracefile_identifier='tr10046';
alter session set events '10046 trace name context forever, level 12';

tkprof – analyze tracefiles

After creating some traces (e.g. via event 10046)  you can analyze those traces with tkprof

tkprof <input tracefile> <output file>  aggregate=no sys=no explain=username/password

sys=no                 hiddes the recursive calls
aggregate=no    doesn’t aggregate reoccured statements to one summary

with sort=xxxx,yyyy,zzzz you can sort the output

     prscnt  number of times parse was called
     prscpu  cpu time parsing
     prsela  elapsed time parsing
     prsdsk  number of disk reads during parse
     prsqry  number of buffers for consistent read during parse
     prscu   number of buffers for current read during parse
     prsmis  number of misses in library cache during parse

     execnt  number of execute was called
     execpu  cpu time spent executing
     exeela  elapsed time executing
     exedsk  number of disk reads during execute
     exeqry  number of buffers for consistent read during execute
     execu   number of buffers for current read during execute
     exerow  number of rows processed during execute
     exemis  number of library cache misses during execute

     fchcnt  number of times fetch was called
     fchcpu  cpu time spent fetching
     fchela  elapsed time fetching
     fchdsk  number of disk reads during fetch
     fchqry  number of buffers for consistent read during fetch
     fchcu   number of buffers for current read during fetch
     fchrow  number of rows fetched