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Count trace files tips

Oracle Database Tips by Donald BurlesonJuly 12, 2013

Question:  How can I count the number of trace files that has been generated in the last hour?  I don't want to use a shell script, I want to count the trace files within Oracle.

Answer:  Traditionally you would create alerts using Oracle shell scripts but Oracle now has views that allow you to count objects that are outside Oracle, objects such as archived redo logs, trace and dump files.  For example, here we use v$diag_dir_ext to locate the full path to the Oracle alert log file:

   physical_filename like 'alert%.log'

Staring in Oracle 11g release 2 ( there is a v$diag_ext view that can be used to count the number of trace files in the dump directories:

select key_value, value from (
with sql_trc as (
/*+ all trace files for last 2 hours*/
where PHYSICAL_FILENAME like '%trc'
and CREATION_TIMESTAMP > trunc(sysdate, 'HH') - interval '2' hour
/*+ only trace files related to rdbms */
sql_all as (
select distinct CREATION_TIMESTAMP, PHYSICAL_FILENAME from sql_trc
select value from v$diag_info where name = 'Diag Trace')
/*+ count trace files created within 1 hour ago */
sql_new1 as (
select count(*) cnt1 from sql_all
where CREATION_TIMESTAMP between trunc(sysdate, 'HH') - 1/24 and trunc(sysdate, 'HH') - 1/86400
/*+ count trace files created within 2 hours ago */
sql_new2 as (
select count(*) cnt2 from sql_all
where CREATION_TIMESTAMP between trunc(sysdate, 'HH') - 2/24 and trunc(sysdate, 'HH') - 1 - 1/86400
/*+ count of all trace files */
select 'CNT' key_value, cnt1 value from sql_new1
union all
/*+ percentage of growth */
select 'PCT', round(100*(cnt1/decode(cnt2, 0, 1, cnt2)), 2) from sql_new1, sql_new2


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