Intelligent_Workload_Management

IntelligentWorkload Management
across Database Replicas
20 August 2015 IntelligentWorkload Management, Ritika Nevatia
2
Ritika Nevatia
Under the supervision of Prasanth Kothuri

What do we use?
Manual Load Balancing
20 August 2015 IntelligentWorkload Management, Ritika Nevatia 3

Can we do better?

Why GDS?
Availability
Scalability
Performance
Manageability

Key features
Work Load
Management
Centralized Framework
Work Load
Routing
Region based
Replication lag based
Failover Inter database service failover
Role Based
Global Service
Takes care of role transition via Data Guard
Load Balancing Run-time
Connection

How GDS works?

Services
Representation
Grouping
Routing
to optimal instance
to handle unexpected failovers

• Implements the Oracle Database service model
• GDSCTL
• Any combination of
• Oracle Data Guard
• Oracle Golden Gate
• or any other database replication technology
How GDS works?

Caution!
Global Data Services is primarily
intended for applications that
are replication-aware.
Uses read-only global
services
Uses r/w global services BUT
resolves update conflicts if
same service is offered by
more than one DB
Can tolerate replicated data
(potentially stale) due to
replication lag

What is GDS made of?

20 August 2015
IntelligentWorkload Management, Ritika
Nevatia
12
GDS Pool
GDS Region
Global Service Manager
GDS Catalog
Oracle Notification Servers

20 August 2015
Nevatia
13
GDS Pool
- Subset of services in same
administrative domain
- Simplifies service management
- Higher security (different admin
for each pool)
- One DB – One Pool
- DBs in the pool need not provide
same service
- All DBs providing same service
need to be in same pool

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GDS Region
- Subset of services in same network
domain
- Low network latency
- Region: LAN or MAN
- One region – multiple pools
- One pool – multiple regions
- Buddy regions for GSM

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Nevatia
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Global Service Manager
GSM analogous to remote listener in Oracle
RAC
- Regional listener for connecting to global
services
- Connect time load balancing
- Manage global services across regions
- Collect performance metrics, measure
network latency
- Create run-time load balancing advisory
- Monitor availability of DB instances/global
service and notify their failure
- Each region should have atleast one GSM
- Recommended: 3 GSM per region

20 August 2015
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20 August 2015
Nevatia
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GDS Catalog
- Repository to store config data
- Catalog must reside in 12c DB or
above
- DB can be in/out of the GDS
configuration
- Maybe co-hosted with RMAN or
Oracle Enterprise Manager Catalogs
- Oracle RAC/Data Guard/Clusterware
should be used to enhance availability
of DB where GDS Catalog resides

Oracle Notification Servers
- Used to receive run-time load
balancing advisory and high
availability events from GSM
- Co-located with each GSM
- All ONS are interconnected
- Clients subscribe to ONS and
receive FAN notifications

The process
Give me
service!
Client GSM Instances
Most
optimal
instance
Service
Catalog

More about services
• Functionality of local service is not changed
• Oracle DB 12c provides local and global service
simultaneously
• If you are locally connected to a particular
database, then you can query data on global
services provided by that database

Use Cases
• Load Balancing for Replicated Databases
• Service Failover for Replicated Databases
• Region Affinity in Oracle GoldenGate Multi-Master
• Load Balancing in Oracle GoldenGate Multi-Master
• Balancing Oracle Active Data Guard and Oracle
GoldenGate Reader Farms

Load Balancing in Replicas
• Load metrics
• Region affinity
• Network latency
• Load balancing goals
Meriyn Budapest

Service failovers in Replicas
Meriyn Budapest Meriyn Budapest

Pre-Configuration
1. Review requirements
2. Install GSM
3. Upgrade GDS
4. Start configuration

Configuration
1. Create GDS user
sys@AISBIT:SQL> create user gds identified by "0Gds2015" default tablespace tools temporary
tablespace temp;
sys@AISBIT:SQL> alter user gds quota 10g on tools;
sys@AISBIT:SQL> grant gsmadmin_role to gds;
2. Create GDS Catalog
GDSCTL>create catalog -database AISBIT -user gds/0Gds2015
3. Grant access to gsmcatuser
sys@AISBIP:SQL> alter user gsmcatuser account unlock;
sys@AISBIP:SQL> ALTER USER gsmcatuser IDENTIFIED BY gsm_2015;

Configuration
4. Create GSM
GDSCTL>add gsm -gsm mgsm -listener 10121 -catalog AISBIT
5. SetTime zone for DB
6. Connect to GDS
GDSCTL>connect gds@itrac50018-v:10121:aisbip1
7. Create Pool
GDSCTL> add gdspool -dbpool hr -users gds
8. Create Region
GDSCTL> add region –region west,east

Configuration
8. Create Databases
GDSCTL>add database -connect ERTS_RAC4 -region REGIONORA -gdspool DBPOOLORA
GDSCTL>add database -connect ERTS_RAC5 -region REGIONORA -gdspool DBPOOLORA
9. Create Service
GDSCTL>add service -gdspool DBPOOLORA -service erts_rw -clbgoal LONG -commit_outcome TRUE
-preferred ERTS_RAC4 -available ERTS_RAC5 -commit_outcome TRUE -notification
TRUE -policy automatic -failoverdelay 10 -failoverretry 6 -session_state DYNAMIC
–failovertype TRANSACTION
10. Start Service
GDSCTL>start service –service erts_rw

Instance Modification
GDSCTL>modify service -service erts_rw -database
erts_rac4 -modify_instances -preferred ERTS -
gdspool erts

Global Services Attributes
Failover
failoverdelay failover_delay
failovermethod {NONE |
BASIC}
failoverretry failover_retries
failovertype {NONE |
SESSION | SELECT |
TRANSACTION}
Preferred or
available
databases
available db_list
preferred dbname_list
preferred_all
Region affinity
locality {ANYWHERE |
LOCAL_ONLY}
lag {lag_value | ANY}
region_failover
Goal and Roles
clbgoal {SHORT | LONG}
rlbgoal {SERVICE_TIME |
THROUGHPUT}
role {[PRIMARY] |
[PHYSICAL_STANDBY] [-
failover_primary]
|[LOGICAL_STANDBY]
|[SNAPSHOT_STANDBY]}

Limitations
Oracle 12C
Limited Documentation
Limited Usage

ThankYou
Ritika Nevatia
nevatiaritika@gmail.com
@beingritika

Intelligent_Workload_Management

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