10g New Performance
Features
1.
2.
3.
4.
Metrics
AWR ( DBA_HIST_ )
Time Model
Wait Classes
5. Misc
1.
2.
3.
4.
V$sqlstats
Wait improvements
Client_id
Services
Copyright 2006 Kyle Hailey
#.1
#.2
9i
Waits
v$system_event
v$sql
V$system_event
V$sql –
includes stats
V$session_wait
V$session_event
V$sesstat
v$sysstat
v$session
Copyright 2006 Kyle Hailey
#.3
10g
Waits
SQL
V$sql
V$session
Stats
Sessions
Includes some waits now
Copyright 2006 Kyle Hailey
#.4
Metrics – rates and calculations
DBA_HIST_SQLSTAT
Waits
SQL
V$eventmetric
V$waitclassm
etric
Metrics
Stats
Sessions
V$sysmetric
Copyright 2006 Kyle Hailey
V$sessmetric
#.5
Metrics
What inspired Metrics?
Old
statistics were cumulative
Old statistics lacked history
… a new 10g feature to make our lives easier
What is the IO on the system
right now?
Copyright 2006 Kyle Hailey
#.6
First Tedious Step
Select value from v$sysstat
where name=‘physical reads’;
VALUE
--------------1,533,787
Not much help …Why? Let see …
Copyright 2006 Kyle Hailey
#.7
This tells you … Nothing
GOOD
BAD
1,533,787
30 minutes
IO’s
30 minutes
time
time
Copyright 2006 Kyle Hailey
#.8
YOU Need to do MATH to find Out
Take value at time A
Take value at time B
Delta = (B-A)
or
Rate = (B-A)/elapsed time
Copyright 2006 Kyle Hailey
Methods
 Oracle 6 Utlbstat.sql/Utlestat.sql
 Creates
tables, inserts, deletes
 Oracle 8 introduced Statspack
 Improvement,
but needs to be set up and administered
(by guess who)
 Oracle 10 introduces Metrics (and AWR & OEM)
Copyright 2006 Kyle Hailey
#.9
#.10
Performance Metric Deltas
Kinds of Metric Tables
1. Metric – current deltas
2. Metric History – deltas over last hour
Current Deltas
Values over last hour
V$EVENTMETRIC
V$FILEMETRIC
V$SESSMETRIC
V$SERVICEMETRIC
V$SYSMETRIC
V$SYSMETRIC_SUMMARY
V$WAITCLASSMETRIC
V$FILEMETRIC_HISTORY
V$SYSMETRIC_HISTORY
V$SERVICEMETRIC_HISTORY
V$WAITCLASSMETRIC_HISTORY
Copyright 2006 Kyle Hailey
#.11
Metrics
 Collected at Pre-Set
intervals
 15
second
 60 second
 10 minutes
 30 minutes
 Current Value for
 Deltas
 Rates


per second
per transaction
 Ratios
 Percentages
dependability at your fingertips
Copyright 2006 Kyle Hailey
#.12
Metric Tables
Wait Events


V$EVENTMETRIC (60 secs )
V$WAITCLASSMETRIC (60 secs)
Statistics


V$SESSMETRIC (15 secs Deltas)
V$SYSMETRIC (15 and 60 secs deltas)
Files

V$FILEMETRIC ( 10 minutes)
SQL (the secret is out)
 x$kkssqlsta (30 Minutes) “not a metric” cumulates values up to 30
minutes, then snapshots it to dba_hist_sqlstat
Copyright 2006 Kyle Hailey
#.13
Answer at your fingertips
GOOD
BAD
3 IO/sec
X
1,533,787
513 IO/sec
30 minutes
IO’s
30 minutes
time
time
Copyright 2006 Kyle Hailey
#.14
Now What’s the IO?
Select VALUE , METRIC_UNIT
from v$sysmetric
where metric_name='Physical Reads Per Sec‘;
VALUE METRIC_UNIT
INTSIZE_CSEC
---------- ----------------- -----------654.6736 Reads Per Second
5959
134.9835 Reads Per Second
1515
Avg IO per sec for the last 15 and 60 secs
Copyright 2006 Kyle Hailey
#.15
v$sysmetric
desc v$sysmetric
BEGIN_TIME
END_TIME
INTSIZE_CSEC – interval value in 1/100sec
GROUP_ID
METRIC_ID
METRIC_NAME
VALUE
METRIC_UNIT
Attention: metric_names are different from v$sysstat
Copyright 2006 Kyle Hailey
v$sysmetric 15 Secs
Buffer Cache Hit Ratio
Memory Sorts Ratio
Execute Without Parse Ratio
Soft Parse Ratio
Database CPU Time Ratio
Library Cache Hit Ratio
Shared Pool Free %
Txns Per Logon
Per Sec
User Transaction Per Sec
Per Sec and Per Transaction
Physical Reads
Physical Writes
Physical Reads Direct
Redo Generated
Logons
User Calls
Logical Reads
Redo Writes
Total Table Scans
Full Index Scans
DB Block Gets
Consistent Read Gets
DB Block Changes
Consistent Read Changes
Executions
Copyright 2006 Kyle Hailey
#.16
v$sysmetric 60 Sec
Buffer Cache Hit Ratio
Memory Sorts Ratio
Redo Allocation Hit Ratio
User Commits Percentage
User Rollbacks Percentage
Cursor Cache Hit Ratio
Rows Per Sort
Execute Without Parse Ratio
Soft Parse Ratio
User Calls Ratio
Global Cache Average CR Get Time
Global Cache Average Current Get Time
Global Cache Blocks Corrupted
Global Cache Blocks Lost
Current Logons Count
Current Open Cursors Count
User Limit %
SQL Service Response Time
Database Wait Time Ratio
Database CPU Time Ratio
Row Cache Hit Ratio
Row Cache Miss Ratio
Library Cache Hit Ratio
Library Cache Miss Ratio
Shared Pool Free %
PGA Cache Hit %
Process Limit %
Session Limit %
Txns Per Logon
Copyright 2006 Kyle Hailey
#.17
v$sysmetric 60 Sec
#.18
Per Second and Transaction
Per Sec
User Commits
User Rollbacks
User Transaction
DBWR Checkpoints
Background Checkpoints
Network Traffic Volume
Per Transaction
Response Time
Physical Reads
Physical Writes
Physical Reads Direct
Physical Writes Direct
Physical Reads Direct Lobs
Physical Writes Direct Lobs
Redo Generated
Logons
Open Cursors
User Calls
Recursive Calls
Logical Reads
Redo Writes
Long Table Scans
Total Table Scans
Full Index Scans
Total Index Scans
Total Parse Count
Hard Parse Count
Parse Failure Count
Copyright 2006 Kyle Hailey
Disk Sort
Enqueue Timeouts
Enqueue Waits
Enqueue Deadlocks
Enqueue Requests
DB Block Gets
Consistent Read Gets
DB Block Changes
Consistent Read Changes
CPU Usage
CR Blocks Created
CR Undo Records Applied
User Rollback Undo Records Applied
Leaf Node Splits
Branch Node Splits
PX downgraded 1 to 25%
PX downgraded 25 to 50%
PX downgraded 50 to 75%
PX downgraded 75 to 99%
.
#.19
v$sessmetric
desc v$sessmetric
BEGIN_TIME
END_TIME
• Only 15 second
Delta
INTSIZE_CSEC
SESSION_ID
SESSION_SERIAL_NUM
CPU
PHYSICAL_READS
PGA_MEMORY
HARD_PARSES
SOFT_PARSES
PHYSICAL_READ_PCT
LOGICAL_READ_PCT
Copyright 2006 Kyle Hailey
#.20
Desc v$eventmetric
SQL> desc v$eventmetric
Name
---------------------------------BEGIN_TIME
END_TIME
INTSIZE_CSEC
EVENT#
EVENT_ID
NUM_SESS_WAITING
TIME_WAITED
WAIT_COUNT
Copyright 2006 Kyle Hailey
Type
-----DATE
DATE
NUMBER
NUMBER
NUMBER
NUMBER
NUMBER
NUMBER
#.21
Select from v$eventmetric
SQL> select
en.name name,
num_sess_waiting WAITERS,
time_waited,
wait_count
from
v$eventmetric em,
v$event_name en
where
wait_count > 0
and en.event# = em.event#
/
Copyright 2006 Kyle Hailey
v$eventmetric results
#.22
NAME
WAITERS TIME_WAITED WAIT_COUNT
------------------------------ ------- ----------- --------pmon timer
1
5875
20
process startup
0
13
1
rdbms ipc message
7
41104
168
control file sequential read
0
0
10
control file parallel write
0
2
20
log file parallel write
0
0
1
SQL*Net message to client
0
0
47
SQL*Net more data to client
0
1
4
SQL*Net message from client
4
14721
47
SQL*Net more data from client
0
0
1
queue messages
2
12012
24
Queue Monitor Wait
1
3000
1
Queue Monitor Task Wait
0
0
1
Copyright 2006 Kyle Hailey
#.23
Historical Metrics
We solved what’s Happening now… but
 What if your problem happened 10 minutes
ago?
 How do we get History?
 What happened in the past?
More work, Time and calculations by YOU
Copyright 2006 Kyle Hailey
#.24
Historical Metrics
v$sysstat
physical reads
Low rate
Little IO
High rate
Lots of IO
Copyright 2006 Kyle Hailey
#.25
Metric History Tables
 Last 60 minutes of history, in memory
v$sysstat
physical reads
delta
delta
delta
delta
delta
delta
delta
60 secs
60 secs
60 secs
60 secs
60 secs
60 secs
Copyright 2006 Kyle Hailey
60 secs
#.26
Metric History Tables
Last hour of statistics at your fingertips :
Statistics

V$SYSMETRIC_HISTORY


60 seconds for an hour
3 minutes of 15 second
File IO

V$FILEMETRIC_HISTORY

10 minutes for an hour
Waits

V$WAITCLASSMETRIC_HISTORY

60 seconds for an hour
Copyright 2006 Kyle Hailey
#.27
v$sysmetric_history
3 minutes of 15 second deltas
60 minutes of 1 minute deltas
Not saved to disk but summary is
Copyright 2006 Kyle Hailey
#.28
What was IO 30 minutes ago?
Once again the answer is at your fingertips
Select
to_char(end_time,'DD-MON-YY HH24:MI'),
VALUE ,
METRIC_UNIT
from
v$sysmetric_history
where
METRIC_NAME = 'Physical Reads Per Sec' and
END_TIME < ( sysdate - (30/(24*60))) and
END_TIME > ( sysdate - (35/(24*60)))
TO_CHAR(END_TIM
VALUE
order by end_time;
--------------- ---------08-JAN-08
08-JAN-08
08-JAN-08
08-JAN-08
08-JAN-08
11:38
118.65
11:39 76.6166667
11:40 3.44770153
11:41
28.7
11:42 19.6166667
Copyright 2006 Kyle Hailey
METRIC_UNIT
---------------Reads Per Second
Reads Per Second
Reads Per Second
Reads Per Second
Reads Per Second
#.29
V$FILEMETRIC_HISTORY
select
from
BEGIN_TIME,
FILE_ID,
PHYSICAL_READS
V$FILEMETRIC_HISTORY;
BEGIN_TI
FILE_ID PHYSICAL_READS
-------- ---------- -------------04:12:16
1
208
04:12:16
2
600
Physical Reads
04:02:18
04:02:18
1
2
600
189
file
03:52:15
03:52:15
1
2
1922
2082
…
Copyright 2006 Kyle Hailey
Broken down by
#.30
Metrics Family of Tables
Stats
Waits
Files
SQL
Raw
V$sysstat
v$system_event
v$event_histogram
v$system_wait_class
v$fileio
v$sqlstat
Deltas
V$sysmetric
V$SYSMETRIC
V$SYSMETRIC_SUMMARY
V$SESSMETRIC
v$eventmetric
v$waitclassmetric
v$filemetric
v$kkssqlsta
V$sysmetric_history
V$sysmetric_summary
v$waitclassmetric_history
v$filemetric_history
(v$kkssqlsta)
1 Hour
7 days
DBA_HIST_
SYSMETRIC_SUMMARY
DBA_HIST_SQLSTAT
Copyright 2006 Kyle Hailey
Session Statistics View
stats
waits
waitclasses
sql
V$
V$sessstat
V$session_event
----------------
----------------(some stats
possible
from ASH)
Metrics
V$sessmetric
-----------------
-----------------
-----------------
Metrics
-----------------
-----------------
-----------------
-----------------
----------------(some stats
possible from
ASH)
----------------
----------------(some stats
possible
from ASH)
history
AWR
WRH$_SESSMET
RIC_HISTORY *
(alert only)
Copyright 2006 Kyle Hailey
#.31
Metric Alerts
If Alerts fire on Metrics, then the deltas are kept in
historical table for 7 days by default
Statistics
DBA_HIST_SYSMETRIC_HISTORY
 DBA_HIST_SESSMETRIC_HISTORY

Waits

WAITCLASSMETRIC_HISTORY
File IO

DBA_HIST_FILEMETRIC_HISTORY
Copyright 2006 Kyle Hailey
#.32
Metrics Family of Tables
Stats
Waits
Files
Raw
V$sysstat
v$system_event
v$event_histogram
v$system_wait_class
v$fileio
Now
V$sysmetric
V$SYSMETRIC
V$SYSMETRIC_SUMMARY
V$SESSMETRIC
v$eventmetric
v$waitclassmetric
v$filemetric
V$sysmetric_history
V$sysmetric_summary
v$waitclassmetric_history
v$filemetric_history
DBA_HIST_
DBA_HIST_
WAITCLASSMETRIC_HISTORY
DBA_HIST_
1 Hour
7 days
Alerts
only
SYSMETRIC_HISTORY
DBA_HIST_
SESSMETRIC_HISTORY
Copyright 2006 Kyle Hailey
FILEMETRIC_HISTORY
#.33
#.34
AWR
Automatic Workload Repository
 Statspack on Steroids
 More efficient than Statspack
 More
in memory
 Less latching
 Keeps stats every hour
 Stores by default the last 7 days
Copyright 2006 Kyle Hailey
#.35
Snapshoting
Done automatically out of the box, but can be run by hand:
BEGIN
DBMS_WORKLOAD_REPOSITORY.CREATE_SNAPSHOT ();
END;
/
Copyright 2006 Kyle Hailey
DBA_HIST
#.36
DBA_HIST_RESOURCE_LIMIT
dbms_workload_repository.drop_snapshot_range
DBA_HIST_SHARED_POOL_ADVICE
DBA_HIST_DATABASE_INSTANCE
DBA_HIST_SNAPSHOT
- DBA_HIST_SNAP_ERROR
- DBA_HIST_BASELINE
- DBA_HIST_WR_CONTROL ? (work load repository ?)
- DBA_HIST_DATAFILE
DBA_HIST_FILESTATXS – only file number, no name
- DBA_HIST_TEMPFILE
DBA_HIST_TEMPSTATXS – onl;y file number
+DBA_HIST_SQLSTAT group by parent cursor plus DELTAs was (stats$sql_summary)
DBA_HIST_SQLTEXT
+DBA_HIST_SQL_SUMMARY – identify litterals (was stat$sql_statistics)
DBA_HIST_SQL_PLAN
-DBA_HIST_SQLBIND
-DBA_HIST_SQLBIND_META - WRH$_SQL_BIND_METADATA
-DBA_HIST_OPTIMIZER_ENV
-DBA_HIST_EVENT_NAME
DBA_HIST_SYSTEM_EVENT
DBA_HIST_BG_EVENT_SUMMARY – sum of backgrounds
DBA_HIST_WAITSTAT
DBA_HIST_ENQUEUE_STAT
-DBA_HIST_LATCH_NAME
DBA_HIST_LATCH
DBA_HIST_LATCH_CHILDREN
DBA_HIST_LATCH_PARENT
DBA_HIST_LATCH_MISSES_SUMMARY – summed over parent latch
DBA_HIST_LIBRARYCACHE
DBA_HIST_DB_CACHE_ADVICE
DBA_HIST_BUFFER_POOL_STAT
DBA_HIST_ROWCACHE_SUMMARY – summed over rowcache entries
DBA_HIST_SGA
DBA_HIST_SGASTAT
DBA_HIST_PGASTAT
New in 10g
?DBA_HIST_SQL_WORKAREA_HSTGRM
DBA_HIST_PGA_TARGET_ADVICE
DBA_HIST_INSTANCE_RECOVERY
DBA_HIST_JAVA_POOL_ADVICE
DBA_HIST_THREAD - logswitches
-DBA_HIST_STAT_NAME
DBA_HIST_SYSSTAT
-DBA_HIST_SYS_TIME_MODEL
-DBA_HIST_OSSTAT_NAME
-DBA_HIST_OSSTAT
DBA_HIST_PARAMETER_NAME
DBA_HIST_PARAMETER
DBA_HIST_UNDOSTAT
DBA_HIST_ROLLSTAT
DBA_HIST_SEG_STAT
DBA_HIST_SEG_STAT_OBJ – object name
-DBA_HIST_METRIC_NAME
-DBA_HIST_SYSMETRIC_HISTORY alert
-DBA_HIST_SYSMETRIC_SUMMARY – max, min, avg standard
deviation
-DBA_HIST_SESSMETRIC_HISTORY alert
-DBA_HIST_FILEMETRIC_HISTORY alert
-DBA_HIST_WAITCLASSMET_HISTORY alert
DBA_HIST_DLM_MISC
-DBA_HIST_RCVRY_FILE_DEST_STAT
-DBA_HIST_RMAN_PERFORMANCE
-DBA_HIST_ACTIVE_SESS_HISTORY – every 10th point from
v$active_session_history
-DBA_HIST_TABLESPACE_STAT
-DBA_HIST_LOG
DBA_HIST_MTTR_TARGET_ADVICE
-DBA_HIST_TBSPC_SPACE_USAGE - ?
Copyright 2006 Kyle Hailey
Retention and Interval
#.37
Defaults:
 Hourly snapshots
 7 days saved
SELECT retention, snap_interval FROM wrm$_wr_control;
RETENTION
SNAP_INTERVAL
----------------- -----------------+00007 00:00:00.0 +00000 01:00:00.0
Minutes
exec dbms_workload_repository.modify_snapshot_settings(14*24*60,30);
RETENTION
SNAP_INTERVAL
----------------- ----------------+00014 00:00:00.0 +00000 00:30:00.0
Copyright 2006 Kyle Hailey
#.38
AWR RPT
@?/rdbms/admin/awrrpt.sql
 Creates Report File
 Similar to STATSPACK report
 More efficient and more data
 HTML or TEXT
Copyright 2006 Kyle Hailey
AWR Report
 Can also be run
SELECT * FROM TABLE(
dbms_workload_repository.awr_report_text(
(select dbid from v$database),
1,
124, -- begin id
125 -- end id
))
Copyright 2006 Kyle Hailey
#.39
#.40
AWR Report
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
General info
Load Profile
Wait Events
OS Stats
Service Stats
Top SQL by sql_id
SQL Text
Instance Statistic
I/O Stat
Buffer Pool Stats
11) Advisories
1) Buffer pool
2) PGA
3) Shared Pool
4) SGA
5) Streams
6) Java
Copyright 2006 Kyle Hailey
12) Buffer Pool Stats
13) Wait Stats
1) Buffer Busy
2) Enqueues
14) Undo Stats
15) Latch Stats
16) Segment Stats
17) Dictionary Stats
18) Library Cache
19) Memory SGA/PGA
20) Streams
21) Init.ora
#.41
Awr 1-13
Copyright 2006 Kyle Hailey
#.42
AWR 14-26
Copyright 2006 Kyle Hailey
AWR Diff
SELECT * FROM TABLE(
dbms_workload_repository.awr_diff_report_text(
(select dbid from v$database),
1,
120,
121,
(select dbid from v$database),
1,
122,
123)
);
Also : AWR_DIFF_REPORT_HTML
Copyright 2006 Kyle Hailey
#.43
#.44
AWR Diff Report in OEM
NOTE: Package
AWR_DIFF_REPORT_HTML
Is different from OEM
Its just a tabular output
Copyright 2006 Kyle Hailey
#.45
Also, ADDM report by Hand
select dbms_advisor.get_task_report(task_name)
from dba_advisor_tasks
where task_id = (
select max(t.task_id)
from dba_advisor_tasks t,
dba_advisor_log l
where t.task_id = l.task_id and
t.advisor_name = 'ADDM' and
l.status = 'COMPLETED');
Set long 100000
Maximum is is 2,000,000,000 bytes
.
Copyright 2006 Kyle Hailey
#.46
Important AWR Tables
 DBA_HIST_SQLSTAT

SQL deltas
 DBA_HIST_SEG_STAT

Segment deltas
 DBA_HIST_SYSMETRIC_SUMMARY

Stats, max, min, avg
 DBA_HIST_ACTIVE_SESS_HISTORY

ASH
 DBA_HIST_SYSTEM_EVENT

Waits
dba_hist_sqltext – get sql text from AWR
Copyright 2006 Kyle Hailey
DBA_HIST_SNAPSHOT
SQL> desc DBA_HIST_SNAPSHOT
Name
------------------SNAP_ID
DBID
INSTANCE_NUMBER
STARTUP_TIME
BEGIN_INTERVAL_TIME
END_INTERVAL_TIME
FLUSH_ELAPSED
SNAP_LEVEL
ERROR_COUNT
Type
----------------------NUMBER
NUMBER
NUMBER
TIMESTAMP(3)
TIMESTAMP(3)
TIMESTAMP(3)
INTERVAL DAY(5) TO SECOND(1)
NUMBER
NUMBER
Copyright 2006 Kyle Hailey
#.47
DBA_HIST_SQLSTAT
SNAP_ID
DBID
INSTANCE_NUMBER
SQL_ID
PLAN_HASH_VALUE
OPTIMIZER_COST
OPTIMIZER_MODE
OPTIMIZER_ENV_HASH_VALUE
SHARABLE_MEM
LOADED_VERSIONS
VERSION_COUNT
MODULE
ACTION
SQL_PROFILE
FORCE_MATCHING_SIGNATURE
PARSING_SCHEMA_ID
PARSING_SCHEMA_NAME
BIND_DATA
FETCHES_DELTA
END_OF_FETCH_COUNT_DELTA
SORTS_DELTA
EXECUTIONS_DELTA
PX_SERVERS_EXECS_DELTA
LOADS_DELTA
INVALIDATIONS_DELTA
PARSE_CALLS_DELTA
DISK_READS_DELTA
BUFFER_GETS_DELTA
ROWS_PROCESSED_DELTA
CPU_TIME_DELTA
ELAPSED_TIME_DELTA
IOWAIT_DELTA
CLWAIT_DELTA
APWAIT_DELTA
CCWAIT_DELTA
DIRECT_WRITES_DELTA
PLSEXEC_TIME_DELTA
JAVEXEC_TIME_DELTA
Copyright 2006 Kyle Hailey
#.48
DBA_HIST_SEG_STAT
SQL> desc DBA_HIST_SEG_STAT
PHYSICAL_WRITES_TOTAL
Name
-------------------------------
PHYSICAL_WRITES_DELTA
SNAP_ID
PHYSICAL_READS_DIRECT_TOTAL
DBID
PHYSICAL_READS_DIRECT_DELTA
INSTANCE_NUMBER
PHYSICAL_WRITES_DIRECT_TOTAL
TS#
PHYSICAL_WRITES_DIRECT_DELTA
OBJ#
ITL_WAITS_TOTAL
DATAOBJ#
ITL_WAITS_DELTA
LOGICAL_READS_TOTAL
ROW_LOCK_WAITS_TOTAL
LOGICAL_READS_DELTA
ROW_LOCK_WAITS_DELTA
BUFFER_BUSY_WAITS_TOTAL
SPACE_USED_TOTAL
BUFFER_BUSY_WAITS_DELTA
SPACE_USED_DELTA
DB_BLOCK_CHANGES_TOTAL
SPACE_ALLOCATED_TOTAL
DB_BLOCK_CHANGES_DELTA
SPACE_ALLOCATED_DELTA
PHYSICAL_READS_TOTAL
TABLE_SCANS_TOTAL
PHYSICAL_READS_DELTA
TABLE_SCANS_DELTA
Copyright 2006 Kyle Hailey
#.49
ITL Waits
#.50
select begin_interval_time,
o.name, itl_waits_delta itl
from DBA_HIST_SEG_STAT ss,
DBA_HIST_SNAPSHOT sn,
obj$ o
where o.obj# = ss.obj#
and itl_waits_delta > 10
and sn.snap_id=ss.snap_id;
BEGIN
--------------06-JAN-08 10:00
06-JAN-08 01:00
06-JAN-08 19:00
Copyright 2006 Kyle Hailey
NAME
ITL
---------- ----ITL
24
ITL
40
T1_I1
2071
#.51
DBA_HIST_SYSTEM_EVENT
SQL> desc DBA_HIST_SYSTEM_EVENT
Name
Type
---------------------------------SNAP_ID
NUMBER
DBID
NUMBER
INSTANCE_NUMBER
NUMBER
EVENT_ID
NUMBER
EVENT_NAME
VARCHAR2(64)
WAIT_CLASS_ID
NUMBER
WAIT_CLASS
VARCHAR2(64)
TOTAL_WAITS
NUMBER
TOTAL_TIMEOUTS
NUMBER
TIME_WAITED_MICRO
NUMBER
Cumulative Values – can use LAG function
Copyright 2006 Kyle Hailey
#.52
Average Wait Times
select
btime,
(time_ms_end-time_ms_beg)/nullif(count_end-count_beg,0) avg_ms
from (
select
to_char(s.BEGIN_INTERVAL_TIME,'DD-MON-YY HH24:MI') btime,
total_waits count_end,
time_waited_micro/1000 time_ms_end,
Lag (e.time_waited_micro/1000)
OVER( PARTITION BY e.event_name ORDER BY s.snap_id) time_ms_beg,
Lag (e.total_waits)
OVER( PARTITION BY e.event_name ORDER BY s.snap_id) count_beg
from
DBA_HIST_SYSTEM_EVENT e,
BTIME
AVG_MS
DBA_HIST_SNAPSHOT s
-------------------- -----------where
08-JAN-08 01:00
1.017
s.snap_id=e.snap_id
08-JAN-08 02:00
.720
and e.event_name= '&1'
08-JAN-08 03:00
.621
order by begin_interval_time
08-JAN-08 04:00
1.747
)
08-JAN-08 05:00
1.046
order by btime;
08-JAN-08 06:00
Copyright 2006 Kyle Hailey
1.444
#.53
ASH RPT
 @?/rdbms/admin/ashrpt
 Detailed report on top SQL, Sessions, Objects etc
 Run over SQL*Net with
select output
from table(dbms_workload_repository.ash_report_text(
(select dbid from v$database),
1,
sysdate – 2/24,
sysdate – 1/24,
0)) ;
 Also ASH_REPORT_HTML
Copyright 2006 Kyle Hailey
#.54
ASH RPT
1) General info
2) Top User Events ***
3) Top Background Events
4) Top Event P1/P2/P3 Values
5) Top Service/Module
6) Top Client IDs
7) Top SQL Command Types
8) Top SQL Statements ***
9) Top SQL using literals
10) Top Sessions ***
11) Top Blocking Sessions
12) Top Sessions running PQs
13) Top DB Objects
14) Top DB Files
15) Top Latches
16) Activity Over Time ***
Copyright 2006 Kyle Hailey
#.55
ASH RPT HTML
Copyright 2006 Kyle Hailey
#.56
Time Model
New concept
• DB Time
Total time for all database calls
• cpu time
• wait time
Copyright 2006 Kyle Hailey
Time Model
Time Model
SQL
Wait
Metrics
Stats
Sessions
Copyright 2006 Kyle Hailey
#.57
#.58
Time Model areas
 Total Time
 CPU
 Elapsed Time
 SQL execution
 Plsql execution (sql execute subtracted out)
 Java execution
 Connection time
 Probably
the most important as it points out
problems with too many logons/sec
Copyright 2006 Kyle Hailey
Time Model Components
1) background elapsed time
2) background cpu time
1) DB time
2) DB CPU
2) connection management call elapsed time
2) sequence load elapsed time
2) sql execute elapsed time
2) parse time elapsed
3) hard parse elapsed time
4) hard parse (sharing criteria) elapsed time
5) hard parse (bind mismatch) elapsed time
3) failed parse elapsed time
4) failed parse (out of shared memory) elapsed time
2) PL/SQL execution elapsed time
2) inbound PL/SQL rpc elapsed time
2) PL/SQL compilation elapsed time
2) Java execution elapsed time
Copyright 2006 Kyle Hailey
#.59
#.60
Total Time
Total Database
Time
Copyright 2006 Kyle Hailey
#.61
Total and CPU
=~ DB Wait
Time
DB CPU
Time
Copyright 2006 Kyle Hailey
#.62
Total and CPU and
Parse Time
DB CPU
Time
DB Wait
Time
Parse
Elapsed
Time
Copyright 2006 Kyle Hailey
#.63
Parse Time
Parse
Elapsed
Time
Copyright 2006 Kyle Hailey
#.64
Hard Parse
Parse
time
elapsed
Copyright 2006 Kyle Hailey
hard
parse
elapse
d time
#.65
Hard Parse Sharing Criteria
Parse
time
elapsed
hard
parse
elapse
d time
Copyright 2006 Kyle Hailey
hard
parse
(sharing
criteria)
elapsed
time
#.66
Hard Parse Bind Mismatch
Parse
time
elapsed
hard
parse
hard (sharing
parse criteria)
elapse elapsed
d time
time
Copyright 2006 Kyle Hailey
hard
parse
(bind
mismat
ch)
elapsed
time
#.67
Time Model Tables
Current cumulative values
 V$SYS_TIME_MODEL
 V$SESS_TIME_MODEL
AWR Snapshots of cumulative values
 DBA_HIST_SYS_TIME_MODEL
Tables show cumulative values. To find deltas, then
need to run AWR report
Copyright 2006 Kyle Hailey
#.68
Wait Classes
Administrative (39)





switch logfile
rebuild index
Application (11)


enqueues
sqlnet break/reset
Cluster (113)
Commit (1)

Log file Sync
Concurrency (12)



Latches: cbc, lbc,
Lib cache locks
Buffer busy wait
Configuration (20)
log file size
Enqueues: ST, HW, ITL
Latch: redo copy,shared pool
Idle (56)
Network (25)
System I/O (19)
Scheduler (6)
User I/O (12)
Other (485)
Copyright 2006 Kyle Hailey
#.69
Wait Class Tables
v$system_wait_class
 cumulative
v$waitclassmetric
 Current
rates
v$waitclassmetric_history
 Hour
of rates (60 second intervals)
Copyright 2006 Kyle Hailey
Waits Metrics
Cumulative
Current deltas
Last Hour
v$waitclassmetric
v$waitclassmetric_history
BEGIN_TIME
BEGIN_TIME
END_TIME
END_TIME
INTSIZE_CSEC
INTSIZE_CSEC
WAIT_CLASS_ID
WAIT_CLASS_ID
WAIT_CLASS#
WAIT_CLASS#
NUM_SESS_WAITING
NUM_SESS_WAITING
TIME_WAITED
TIME_WAITED
WAIT_COUNT
WAIT_COUNT
#.70
Last 7 days
Wait Classes
v$system_wait_class
WAIT_CLASS_ID
WAIT_CLASS#
WAIT_CLASS
TOTAL_WAITS
TIME_WAITED
v$event_name
EVENT#
dba_hist_
waitclassmetric_history
Only gets populated with alerts
EVENT_ID
NAME
PARAMETER1
PARAMETER2
PARAMETER3
WAIT_CLASS_ID
WAIT_CLASS#
WAIT_CLASS
Wait Events
v$system_event
EVENT
TOTAL_WAITS
TOTAL_TIMEOUTS
TIME_WAITED
AVERAGE_WAIT
TIME_WAITED_MICRO
EVENT_ID
v$eventmetric
BEGIN_TIME
END_TIME
INTSIZE_CSEC
EVENT_ID
NUM_SESS_WAITING
TIME_WAITED
WAIT_COUNT
dba_hist_system_event
(Cumulative)
No in memory history
Copyright 2006 Kyle Hailey
#.71
Miscellaneous
 V$sqlstats
 Field naming conventions
 Wait Improvements
 Wait
histograms
 Waits in v$session and v$sql
 Waits broken out for latches and locks
 Waits show the blocker
 Wait history of last 10 waits
 Services
 Client Id
Copyright 2006 Kyle Hailey
#.72
v$sqlstats
 More efficient than v$sql or v$sqlarea
 Skips many of the latch gets that v$sql does
Copyright 2006 Kyle Hailey
#.73
Event and Stat Fields Names
 Names
Event
 Statistic
 Waitclass

 Ids
Event#
 Statistic#
 Waitclass#

 Name Hash
Event_id
 Statistic_id
 Waitclass_id

Copyright 2006 Kyle Hailey
#.74
Wait Histograms
V$event_histogram
 1ms to 1 hour buckets
 23 buckets
 < 1 ms, < 2 ms, < 4 ms, < 8 ms, ..., < 2^22 ms
Copyright 2006 Kyle Hailey
#.75
Waits in v$session
 V$session exposes all the fields from v$session_wait
SEQ#
EVENT#
EVENT
P1TEXT
P1
P1RAW
P2TEXT
P2
P2RAW
P3TEXT
P3
P3RAW
WAIT_CLASS_ID
WAIT_CLASS#
WAIT_CLASS
WAIT_TIME
SECONDS_IN_WAIT
STATE
NUMBER
NUMBER
VARCHAR2(64)
VARCHAR2(64)
NUMBER
RAW(4)
VARCHAR2(64)
NUMBER
RAW(4)
VARCHAR2(64)
NUMBER
RAW(4)
NUMBER
NUMBER
VARCHAR2(64)
NUMBER
NUMBER
VARCHAR2(19)
Copyright 2006 Kyle Hailey
Waits in V$SQL













SQL_FULLTEXT
SQL_ID
FETCHES
END_OF_FETCH_COUNT
DIRECT_WRITES
CONCURRENCY_WAIT_TIME
APPLICATION_WAIT_TIME
CLUSTER_WAIT_TIME
USER_IO_WAIT_TIME
PLSQL_EXEC_TIME
JAVA_EXEC_TIME
CPU_TIME
ELAPSED_TIME
Copyright 2006 Kyle Hailey
#.76
#.77
Wait Types Broken Out
 800 waits
 Latches broken out
 Ex)
Latch: library cache latch
 Enqueues broken out
 Ex)
Enq: HW - contention
Copyright 2006 Kyle Hailey
#.78
Waits show Blocking Session
V$session. BLOCKING_SESSION -> can
build a wait tree:
Copyright 2006 Kyle Hailey
#.79
Services
 Services is a new way to measure resource
usage and statistics. A session is associated
with a services when the session connects to
the database via the listener.
 DBMS_SERVICE.CREATE_SERVICE
Copyright 2006 Kyle Hailey
#.80
Setting up Services
dbms_service.CREATE_SERVICE('ora10a',‘A');
dbms_service.START_SERVICE ('ora10a');
-- dbms_service.STOP_SERVICE ('ora10a');
-- dbms_service.DELETE_SERVICE('ora10a');
ORA10a =
tnsnames.ora
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)
Sqlplus
(HOST = kylehpd)(PORT = 1521)) )
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = A)
) )
un/pw@ora10a
lsnrctl services
Service "A" has 1 instance(s).
Instance "v10g", status READY, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:0 refused:0 state:ready
Copyright 2006 Kyle Hailey
Services in OEM
Enable Trace
By Service
View doesn’t work
Copyright 2006 Kyle Hailey
#.81
Client Id
#.82
 Setting Client ID
dbms_session.set_identifier(client_id)
 Enabling trace for a client ID
dbms_monitor.client_id_trace_enable
(client_id, TRUE, FALSE)
 Enabling statistics aggregation by client id
dbms_monitor.client_id_stat_enable(client_id)
 Script to Extract Client Trace
trcsess
Copyright 2006 Kyle Hailey
Session Dedicated
Scott
John
Sue
Randy
Mike
Oracle
Sessions
S1
S2
S3
S4
S4
Oracle Database Host
Copyright 2006 Kyle Hailey
S5
Mary
Tim
S6
#.83
Session Dedicated trace
Scott
John
Sue
Randy
Mike
Mary
Tim
SQL_TRACE=TRUE
Oracle
Sessions
S1
S2
S3
S4
S4
Oracle Database Host
Copyright 2006 Kyle Hailey
S5
S6
#.84
#.85
Session Pooling trace
Scott
John
Sue
Randy
Mike
Mary
Tim
APP
Server
1
S1, sql_trace=true
Oracle
Sessions
S1
S2
S3
S4
S4
Oracle Database Host
Copyright 2006 Kyle Hailey
S5
S6
S7
Session Pooling
Scott
John
Sue
Randy
Mike
Set client_id =
SCOTT
#.86
Mary
Tim
dbms_monitor.client_id_trace_enable
TRUE, FALSE);
waits, binds
APP (client_id,
Server
1
Oracle
Sessions
S1
S2
S3
S4
S4
Oracle Database Host
Copyright 2006 Kyle Hailey
S5
S6
S7
#.87
DB_FILE_MULTI_BLOCK_READ_COUNT
 Auto tuned in 10gR2
 Recommended to leave unset in init.ora
 db_file_multiblock_read_count
 _db_file_exec_read_count
 _db_file_optimizer_read_count
Copyright 2006 Kyle Hailey
55
55
8
#.88
UNDO Retention Auto Tuned
 Oracle10G records the times of the longest-running
queries and the amount of undo generated to
automatically tune the UNDO_RETENTION
parameter.
 IF Autoextend on then undo retention set slightly
longer than the longest running query
 If autoextend off then depends on free space
available
 Bug 5387030 – undo retention higher than set
Copyright 2006 Kyle Hailey