Oracle Rac Performance Tunning Tips&Tricks

TEN VITAL TIPS FOR ORACLE RAC
PERFORMANCE
ZEKERİYA BEŞİROĞLU
EXPERT CONSULTANT&INSTRUCTOR
BİLGİNC IT ACADEMY ISTANBUL
TURKİSH ORACLE USER GROUP
ORACLE OPEN WORLD 15
SAN FRANCİSCO

TEN VITAL TIPS FOR REAL APPLICATION CLUSTER PERFORMANCE ZEKERIYABESIROGLU.COM
WHO I AM
▸ Oracle Ace Database Management & Performance
▸ OCP since 2002
▸ OCE Rac Expert
▸ Exadata Specialist
▸ President of TROUG
▸ Expert Consultant & Oracle University Instructor

BILGINC IT ACADEMY —- WWW.BILGINC.COM

TEN VITAL TIPS
▸ CAPACITY & ARCHITECTURE
▸ SQL TUNING
▸ PARALLEL QUERY TUNING
▸ TUNING DATABASE
▸ TUNING NETWORK
▸ RECOVERY TUNING
▸ GLOBAL CACHE TUNING
▸ TUNING STORAGE
▸ TUNNNG CLUSTERWARE
▸ TOOLS

1-CAPACITY & ARCHITECTURE

CAPACITY & ARCHITECTURE
▸ Building Balanced Hardware Configuration
▸ High Throughput
▸ You should consider configuring the following hardware components in order to create a
balanced system:
▸ Number and speed of CPUs
▸ Memory size
▸ Number and size of disks
▸ Number and speed of the I/O bandwidth components, such as:
▸ Host Bus Adapters(HBAs)
▸ Switches
▸ Disk Controllers

▸ per Cpu Core avg 100-300 mb/per second
▸ Core = HBA
▸ Fiber switch avg 800 mb/per second
▸ One Disk Array avg 200 mb/per second
▸ Small 15000 rpm disk. 10 disk one array
▸ 4 gb memory per core / 8 gb Compress.

▸Estimating Size of Database Objects
▸ SELECT * FROM TABLE(dbms_space.object_growth_trend(object_owner => 'SH',  
object_name => 'SALES', object_type => 'TABLE'));
▸DBMS_SPACE.CREATE_TABLE_COST(‘USERS’,30(avgrowsize),100000000(rowcount),
10(pctfree),ub,ab);
▸DBMS_OUTPUT.PUT_LINE('Used Bytes = ' || TO_CHAR(ub));
▸DBMS_OUTPUT.PUT_LINE('Allocated Bytes = ' || TO_CHAR(ab));
▸END;
▸/
▸Used Bytes = (100GB)
▸Allocated Bytes = (100GB)

▸Size Interconnect for aggregated throughput – approx 1Gb/sec per 32 cores
▸10Gb/sec or IB generally good for database consolidations and large SMP nodes  
Bonded 1GbE solutions with load balancing are supported  
Use same type NICs for LB and failover
▸Use Jumbo frames wherever possible

2-SQL TUNING

SQL TUNING
▸Optimizing Third Normal Form: 
Power, Partitioning, Parallelism
▸ Power
▸ Partition : Range- Hash partition
▸ Hash count cpus X 2
▸ Paralel degree power X 2 and goal parallel partition-wise join

SQL TUNING

SQL TUNING
▸ Reduce long full-table scans in OLTP systems.
▸ Use Automatic Segment Space Management (ASSM).
▸ Increase sequence caches.
▸ Use partitioning to reduce interinstance traffic.
▸ Avoid unnecessary parsing.
▸ Minimize locking usage.
▸ Remove unselective indexes.
▸ Configure interconnect properly.
▸ In Memory-Parallel Query

SQL TUNING
▸ How to avoid “Write Hot Spots” in applications
▸ Frequent transactional changes to the same data blocks in all instances may result in “write
hot spots”
▸ in 99% of OLTP performance issues write hot spots occur on indexes
▸ Use non-ordered & cached sequences if sequence is used to generate primary key
▸ ALTER SEQUENCE E1 ... CACHE 10000+
▸ Consolidate applications to use only one server and route via services
▸ Place redo logs on fast storage & Separate disks for logs from other IO busy disks
▸ Schema tuning only involves minimal modification
▸ Global hash partitioned indexes
▸ Locally partitioned indexes
▸ Drop unused indexes

3- PARALLEL QUERY TUNING

PARALLEL QUERY TUNING
▸ Parallel execution improves performance for the following:
▸ Queries that perform a full table scan
▸ Fast full index scans
▸ The creation of large indexes
▸ DML operations doing bulk inserts, updates, and deletes
▸ Aggregations and copying
Partitioned index scans
Database recovery

4-TUNING DATABASE

TUNING DATABASE
▸ Distribution of data using data partitions
▸ Distribution of data access using database services
▸ Distribution of workload based on resource availability
▸ Accessing data from a database using indexes
▸ Tuning parameters to help improve performance
▸ Partition pruning
▸ Partition-wise joins
▸ Parallel DML

TUNING DATABASE
▸Sequence Numbers
▸Row level locking causing high contention. Getting and maintaining
sequences can cause enqueue contention on the sequence enqueue and
latches.
▸Due to the non-recursive nature of the transaction, in high INSERT intensive
applications, updates to the table can be queued.
▸There could be serious concurrency issues when this method is used.  

5-TUNING NETWORK

TUNING NETWORK
▸Listeners 
There are two types of listeners in an Oracle Database 11g Release 2 RAC
configuration.
▸SCAN Listeners
▸Database Listeners

TUNING NETWORK
▸For example, the following SDU settings in the TNS connection descriptor will set the value of the SDU
to 16K:
▸ORCL =
▸ (DESCRIPTION =
▸(SDU = 16384) (FAILOVER = ON) (ADDRESS = (PROTOCOL = TCP)(HOST = oradb.istanbul.com)(PORT =
1521))
▸ (LOAD_BALANCE = YES)
▸ (CONNECT_DATA = (SERVER = DEDICATED)
▸ (SERVICE_NAME = ORCL)
▸ (FAILOVER_MODE =(TYPE = SELECT)(METHOD = BASIC)(RETRIES = 10)(DELAY = 3))) )
▸Similar settings should also be made to the listener to ensure that the bytes received by the server
are also of a similar size. SID_LIST_LISTENER =
▸(SID_DESC =
(SDU=16384) (SID_NAME = ORCL)))

6-RECOVERY TUNING

FAST START PARALLEL ROLLBACK

RECOVERY PARALLELLISM
▸ SQL>RECOVER PARALLEL 4;
▸ SQL>RECOVER TABLESPACE SALES
▸ SQL>RECOVER DATAFILE /u01/app/IST/sales.dbf PARALLEL (DEGREE 4);
▸ SQL>RECOVER DATABASE PARALLEL ; -- default DOP is used.

REDO SIZE

CHECKPOINT

7-GLOBAL CACHE TUNING
Data is either stored
‣ 1. Locally (local cache) " access time: nanoseconds
‣ 2. Remote (global cache) " access time: micros.
‣ 3. “On disk”
Flash cache"access time: microseconds
Disk controller cache"access time: micros.
Spinning disk"access time: milliseconds

▸ Global cache optimization

GLOBAL CACHE SCENARIOS
There are several scenarios for single block reads:
‣ Read from Disk
‣ Read – Read
‣ Read – Write
‣ Write – Write
‣ Write – Read
‣ Write to Disk

GLOBAL CACHE SCENARIOS
‣ Instance A
‣ Instance B
‣ Instance C
‣ Instance D-resource master
‣ Database-SCN 1000

READ FROM DISK
‣ Instance A
‣ Instance B
‣ Instance C ——Request to obtain a shared resource
‣ Instance D-resource master

READ FROM DISK
‣ Instance A
‣ Instance B
‣ Instance C
‣ Instance D-(RM)request is granted

READ FROM DISK
‣ Instance A
‣ Instance B
‣ Instance C Read Request
‣ Instance D-(RM)request is granted

READ FROM DISK
‣ Instance A
‣ Instance B
‣ Instance C Read Request —- SCN 1000
‣ Instance D-(RM) Request is Granted
‣ Database-SCN 1000 -Block image Delivered

READ WRITE CACHE FUSION
‣ Instance A
‣ Instance B Request to obtain resource
‣ Instance C SCN 1000
‣ Instance D-(RM)

‣ Instance A
‣ Instance B Request to obtain resource
‣ Instance D-(RM) Instruct to transfer the block to B

‣ Instance A
‣ Instance B Request to obtain resource ——SCN 1000
‣ Instance C SCN 1000-Send Block image to instance B

WRITE WRITE CACHE FUSION
‣ Instance A
‣ Instance B Request to obtain resource ——SCN 1000-write SCN 1001
‣ Instance C SCN 1000-Send Block image to instance B

‣ Instance A-request to write
‣ Instance B SCN 1001
‣ Instance D-(RM)

‣ Instance A-request to write
‣ Instance B SCN 1001
‣ Instance D-(RM)——Instruct to transfer to instance A

‣ Instance A-request to write ——SCN1001
‣ Instance B SCN 1001—-Copy To Buffer

‣ Instance A-request to write ——SCN1001 ———SCN 1002
‣ Instance B SCN 1001—-Copy To Buffer

8-TUNING STORAGE

▸ Types of I/O Operations
▸ Read vs. write 
Single-block vs. multi-block 
Random vs. sequential 
Synchronous vs. asynchronous

▸ I/O Access Patterns
▸ Sequential access

▸ I/O Access Patterns
▸ Random access

▸ How Many Disk Groups?

9-TUNING CLUSTERWARE

10-TOOLS

REMOTE DIAGNOSTIC AGENT

RAC DIAG

ORACHK

OLS
$ ./ols.pl
The Cluster Nodes are : "NodeA, NodeB, NodeC, NodeD"
The Local Node is : "NodeA"
The Remote Nodes are : "NodeB, NodeC, NodeD"
Major Clusterware Version is : "12.1.0.1.0"
CRS_HOME is installed at : "/u01/app/12.1.0/grid"
CRS_BASE is installed at : "/u01/app/crsusr"
CRS_OWNER is : "crsusr"
CRS_GROUP is : "oinstall"
ORACLE_HOMES[0] is installed at : "/u01/app/crsusr/product/12.1.0/dbhome_1"
ORACLE_BASES[0] is installed at : "/u01/app/crsusr"
ORACLE_OWNERS[0] is : "crsusr"

ZEKERİYA BESİROGLU BILGINC IT ACADEMY
ISTANBUL

Oracle Rac Performance Tunning Tips&Tricks

More Related Content

What's hot

Viewers also liked

Similar to Oracle Rac Performance Tunning Tips&Tricks

More from Zekeriya Besiroglu

Recently uploaded

Oracle Rac Performance Tunning Tips&Tricks