AWR Warehouse - An Introduction as presented to HKOUG

1. AWR Warehouse
An Introduction

2. whoami
Developer turned Oracle DBA
Based in Hong Kong
Co-Founder of HKOUG (Hong Kong Oracle User Group)
Occasional Blogger (mostly bugs I hit) at jolliffe.hk
Twitter @jolliffe
https://www.linkedin.com/in/jolliffe

3. Contents
The Automatic Workload Repository
The Case for AWR Warehouse
Configuring and Using AWR Warehouse
A Couple of Recommendations
ETL Process Flow

4. The Automatic Workload
Repository (AWR)

5. The Automatic Workload Repository (AWR)
A built-in repository in every (Enterprise
Edition) Oracle database
Regular snapshots of vital statistics
Data stored in SYSAUX tablespace
Enabled by default
Part of the Diagnostic and Tuning Option ($$$)
Either Query data yourself
Also tightly integrated with Enterpise Manager

6. Active Session History (ASH)
Every second the state every non-idle session
is recorded (in memory), and exposed as
V$ACTIVE_SESSION_HISTORY
One in ten moved to persistent storage:
DBA_HIST_ACTIVE_SESSION_HISTORY
Useful for troubleshooting performance
issues after they happen

7. The Case for AWR Warehouse

8. If AWR is full of
useful
information….
...then why do we
keep throwing it
away?

9. Reasons for Purging AWR
▪ It’s the default (for a reason)
▪ Database/SYSAUX Growth leads to
▪ Longer Backups
▪ Longer Upgrades
▪ Querying affects production
performance ($$$)

10. Enter AWR Warehouse
▪ Offload AWR History to a separate
instance
▪ Schedule backups and upgrades
separately
▪ Leverage Enterprise Manager for
▪ Target Discovery
▪ Reporting

11. Additive Free
▪(Almost) no new tables
▪ Uses current tables (WRH$ exposed
as DBA_HIST_)
▪Partitioned by dbid, snap_id
▪Except
▪ Caw_dbid_mapping
▪ ETL process flow

12. No Hidden Charges
A ... single instance Oracle Database
can be ... used as an infrastructure
repository for ... Automatic Workload
Repository (AWR) Warehouse ...
without additional license
requirements, provided that all the
targets are correctly licensed. It may
not be used or deployed for other uses.
http://docs.oracle.com/cd/E80920_01/DBLIC/Licensing-Information.htm

13. Configuring AWR Warehouse

20. Using AWR Warehouse

26. A Couple of Recommendations

27. Keep It Separate
▪ A Dedicated Instance
▪ On a Dedicated Host
▪ Not OEM Repository

28. Welcome to the Future
▪ Use 12cR2 for the Repository
database
▪ Low risk exposure to
▪ New features
▪ New bugs

29. ETL Process Flow

30. ETL Process Flow - General Points
▪ Use the Source
▪ Separate schedules
▪All objects owned by dbsnmp
▪ Some simplifications
▪ Table Names (CAW_ prefix)
▪ Error Handling

31. Enterprise
ManagerA
AWR
R
R
1234
B
AWR
C
AWR
A B
AWR
567891011
Transfer Load
Extract
Extract
Extract
A B
AWRCAWR
Transfer
Overview

32. 49-6049-63
C
extract_metadata
snaps transferred
01 24 N
25 48 N
49 72 N
3
day
2
1run_extractrun_extract
123456789101112
49-66
48-72
25-48
01-24
AWR
01 24 N
25 48 N
49 72 N
Extract

33. Enterprise
Manager
ZIP
C
extract_metadata
snaps transferred
01 24 N
25 48 N
49 72 N
R
load_metadata
em_id target db_id snaps imported
1 A 101 01 24 N
1 B 102 01 24 N
1 C 103 01 24 N
1 C 103 25 48 N
1 C 103 49 72 N
123456
Y
Y
Y
1 C 103 01 24 N
1 C 103 25 48 N
1 C 103 49 72 N
ZIP ZIPZIP
78
1_xxx_103_01_24.dmp
1_xxx_103_25_48.dmp
1_xxx_103_49_72.dmp
9
Transfer

34. AWRLOAD$201AWRLOAD$203AWRLOAD$201AWRLOAD$202AWRLOAD$201
run_worker
run_master
run_worker
run_master
3
day
2
1
load_workers
target staging_dir
A AWRLOAD$201
B AWRLOAD$202
dbid_mapping
target dbid
R 042
A 101
B 102
C 103
042 101 103102
R
load_metadata
target dbid snaps imported
A 101 49 72 Y
B 102 49 72 Y
C 103 01 24 Y
C 103 25 48 Y
C 103 49 72 Y
dbid CAWR
N
N
Y
Y
NY
NY
NY
A AWRLOAD$201
B AWRLOAD$202
C AWRLOAD$203C AWRLOAD$203
103C
12345678910111213141516171819202122232425
Load SELECT
property_value
FROM
dbsnmp.caw_properties
WHERE
property_name =
'max_parallel_loads';
PROPERTY_VALUE
2

35. In Summary

36. AWR Warehouse saves
you $$$
Install it, use it
Understand how it works

37. Further Reading
https://docs.oracle.com/database/122/TDPPT/using-automatic-workload-repository-warehouse.htm
http://dbakevlar.com/category/awr-warehouse/
https://jolliffe.hk/category/enterprise-manager/awr-warehouse/

38. Any
Questions?Thank You!