your machine and my database · 2018-10-22 · ram @martinklierdba your ... session 2 same or diff....
TRANSCRIPT
![Page 1: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/1.jpg)
![Page 2: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/2.jpg)
YOUR machine and MY database - a performing relationship!?
Martin Klier
Performing Databases GmbHMitterteich
![Page 3: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/3.jpg)
● Martin Klier● Lösungsarchitekt und Datenbankspezialist
● Fachliche Schwerpunkte:– Performanceoptimierung– hochverfügbare Systeme– Cluster und Replikation
● Linux seit 1997● Oracle Database seit 2003
Referent
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 3/55
![Page 4: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/4.jpg)
Referent
● Vorträge
● Kontakt: [email protected]
● Weblog: http://www.usn-it.de
Regionalgruppen
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 4/55
![Page 5: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/5.jpg)
Performing Databases● Spezialisten für Datenbanktechnik
– Konzeptberatung und Vergabekompetenz– Architektur- und Systemplanung– Lizenzierung– Realisierung und Troubleshooting
● Web: http://www.performing-databases.com
● Mail: [email protected]
● Twitter: @PerformingDB
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 5/55
![Page 6: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/6.jpg)
• Introduction
• NUMA + Huge Pages
• Disk IO
• Concurrency
• Engineers to work together
Agenda
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 6/55
![Page 7: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/7.jpg)
Server / CPU
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 7/55
![Page 8: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/8.jpg)
NUMA
Core(s)+SharedCache, LLC
Core(s)+SharedCache, LLC
QPI-C
Core(s)+SharedCache, LLC
Core(s)+SharedCache, LLC
PCIePCIe
IMC IMCQPI-C
IMCQPI-CQPI-CIMC
NonUnifedMemoryAccess
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 8/55
![Page 9: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/9.jpg)
_enable_NUMA_support = TRUE
MOS Doc ID 864633.1
• Multiple Buffer Caches
• Striped pools
=> cross context :((
=> pool access :(
NUMA
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 9/55
![Page 10: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/10.jpg)
26 GB
NUMA
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 10/55
![Page 11: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/11.jpg)
13GB+13GB=26 GB
One buffer cache for each node
NUMA
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 11/55
![Page 12: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/12.jpg)
• Partitioned access
• Can be up to 40% faster
• But....
NUMA
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 12/55
![Page 13: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/13.jpg)
Non-NUMA with NUMA
With my workload and only one listener:Saved <1 page alloc miss per second ?
NUMA
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 13/55
![Page 14: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/14.jpg)
26 GBFits into RAM of one node.OS NUMA optimization at work.
So WHY?
NUMA
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 14/55
![Page 15: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/15.jpg)
System Admin DBA Developer
Relevance-and-care chart
NUMA
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 15/55
![Page 16: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/16.jpg)
Suggestions
• Useful in big environments only (think: DB consolidation)
• Make friends with the system admin,have a joint opinion
• Test thoroughly and quantify use vs. effort (think: bugs)
NUMA
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 16/55
![Page 17: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/17.jpg)
Server / RAM
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 17/55
![Page 18: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/18.jpg)
Shared Memory Segment
SmallOS
Pages
PMON
etc.
Server
OS Kernel managedAccess(permission check)
NewProcess
➔Grant permission➔Integrate in serializationstructures
Per page
RAM
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 18/55
![Page 19: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/19.jpg)
Problems
• Memory Fragmentation
• Wasting CPU with page alloc
• OS_THREAD_STARTUP waits
RAM
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 19/55
![Page 20: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/20.jpg)
Shared Memory Segment
OSPage
NewProcess
Large / HugeOS
Pages
FASTstartup
PMON
Server
FASTaccess
Huge Pages
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 20/55
![Page 21: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/21.jpg)
Alert Log
(17408-3164)*2048kB=28GB
Huge Pages
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 21/55
![Page 22: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/22.jpg)
System Admin DBA Developer
Relevance-and-care chart
Huge Pages
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 22/55
![Page 23: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/23.jpg)
Suggestions Large/Huge Pages
• Useful with SGA >=16GB
• Use largest available & sane page size
• Talk your sysadmin into DOing IT
• Combine with PRE_PAGE_SGA=TRUE
Huge Pages
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 23/55
![Page 24: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/24.jpg)
Storage / SSD
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 24/55
![Page 25: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/25.jpg)
Words
Bits “Cell”
Block
SSD
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 25/55
![Page 26: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/26.jpg)
SSD
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 26/55
![Page 27: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/27.jpg)
16kB – 512kB pro Block
1.erase
SSD
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 27/55
![Page 28: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/28.jpg)
16kB – 512kB pro Block
2.write
SSD
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 28/55
![Page 29: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/29.jpg)
Types and Figures from 2009 - But the terrors are still intact. :)
120:60= *2
85:60= *1.4
SSD
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 29/55
![Page 30: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/30.jpg)
8171 IOPSlike 60 HDDs
8k/16k blocks
80% write20% read
Samsung SSD 840 PRO
8k/16k blocks8k/16k blocks
SSD
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 30/55
![Page 31: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/31.jpg)
System Admin DBA Developer
Relevance-and-care chart
SSD
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 31/55
![Page 32: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/32.jpg)
Suggestions
• Know your IO load profile (AWR, nmon)
• Use enterprise-level devices w/ Single Level Cell (SLC)
• SSDs require different lifecycle handlingin doubt, consider an array of HDDs of same IO power
SSD
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 32/55
![Page 33: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/33.jpg)
Concurrency
means collisions and serialization
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 33/55
![Page 34: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/34.jpg)
Occurrence
• Data Access (Row Lock, Block Header)
• Shared memory organization (Buffer / Library Cache etc.)
• CPU queueing
• Disk / Network IO ..........
Concurrency
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 34/55
![Page 35: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/35.jpg)
5
5
6
?
7
?
X
State B
Protectedor limitedresource Delayed
State A
Concurrency
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 35/55
![Page 36: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/36.jpg)
Row Lock
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 36/55
![Page 37: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/37.jpg)
Header
Row Space
Free Space
===========================================================================
=============================================
ITLentry
Row
Block / Buffer
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 37/55
![Page 38: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/38.jpg)
===========================================================================
=============================================
Session 1
Session 2
IncompatibleLock
Attempt
Spin
ITLentry
Row
Lock and Access
enq: TX - row lock contention
Row Lock
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 38/55
![Page 39: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/39.jpg)
Spinning means
• Active checking of a value in memory
• “Wasting” CPU for non-productive work
• Oracle Spin Count limits and Wait Events are a generosityto limit, see and measure the impact
Concurrency
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 39/55
![Page 40: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/40.jpg)
===========================================================================
=============================================
Resizing
● Limited Space● Concurrent Buffer modif.
spin!
one does it
other one(s)
buffer busy waitenq: TX - allocate ITL entry
ITL Stress
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 40/55
![Page 41: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/41.jpg)
Library CacheObject
Session 1
Session 2
Sleep = WaitS2 spinning on M.
M
S1 holding MutexSame for Latches, but a bit uglier.
Mutex Contention cursor: mutex Scursor: mutex X...
Mutex
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 41/55
![Page 42: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/42.jpg)
CBC 4F BH 1 BH 77
CBC 51 BH 99 BH 32
Chains
Buffer Headers(references in Shared Pool)
Latches
Cache Buffer Chains: Is this block in the BC?
CBC
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 42/55
![Page 43: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/43.jpg)
CBC 4F BH 1 BH 77
Session 1
Session 2 Same or diff. Buffer (Chain), same latch :(
Spin
Locks the chain and looks for a buffer
CBC 51 BH 99 BH 32
latch: cache buffer chain
CBC
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 43/55
![Page 44: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/44.jpg)
System Admin DBA Developer
Relevance-and-care chart
Concurrency
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 44/55
![Page 45: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/45.jpg)
Suggestions
• Check workload (think: SQL efficiency)=> Reduce logical reads/writes
• Be ready for decent diagnosis (think in Wait Events)
Concurrency
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 45/55
![Page 46: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/46.jpg)
Collaborate
It's all about humans working together
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 46/55
![Page 47: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/47.jpg)
ApplicationNetwork
Database
ServerOperating System
SANStorage
Layers
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 47/55
![Page 48: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/48.jpg)
Engineers to work together
People
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 48/55
![Page 49: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/49.jpg)
System Admin DBA Developer
Relevance-and-care chart
“All” is slow!
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 49/55
![Page 50: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/50.jpg)
System Admin DBA Developer
Relevance-and-care chart
It simply works ...
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 50/55
![Page 51: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/51.jpg)
Make sure you have enough parallel beer!
Teamplay!
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 51/55
![Page 52: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/52.jpg)
Thank you very muchfor your attention!
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 52/55
Martin Klier
Performing Databases GmbHMitterteich
![Page 53: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/53.jpg)
More resources on this topic
• Kevin Closson, on NUMA and Huge Pageshttps://kevinclosson.wordpress.com/2010/03/18/you-buy-a-numa-system-oracle-says-disable-numa-what-gives-part-i/http://kevinclosson.wordpress.com/2010/09/28/configuring-linux-hugepages-for-oracle-database-is-just-too-difficult-part-i/
• Craig Shallahamer, on Cache Buffer Chain visualizationhttp://shallahamer-orapub.blogspot.de/2010/09/buffer-cache-visualization-and-tool.html
• Arup Nanda, on ITL / Lockshttp://arup.blogspot.de/2011/01/more-on-interested-transaction-lists.html
• Andrey Nikolaev on Mutexes“Exploring mutexes, the Oracle RDBMS retrial spinlocks”
• Ronan Bourlier & Loïc Fura, IBM“Oracle DB and AIX Best Practices for Performance & Tuning”
• My Oracle SupportDoc ID 864633.1 “Enable Oracle NUMA support with Oracle Server Version 11gR2”Doc ID 1392497.1 “USE_LARGE_PAGES To Enable HugePages”Doc ID 361468.1 “HugePages on Oracle Linux 64-bit”
Read on...
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 53/55
![Page 54: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/54.jpg)
Thank you
Many people have helped with suggestions, critics or taking daily work off me during preparation and travel phase.
Guys, you are top!
@MartinKlierDBA YOUR machine and MY database - a performing relationship?! 54/55
![Page 55: YOUR machine and MY database · 2018-10-22 · RAM @MartinKlierDBA YOUR ... Session 2 Same or diff. Buffer (Chain), same latch :(Spin Locks the chain and looks for a buffer CBC 51](https://reader034.vdocuments.mx/reader034/viewer/2022042302/5eccd775f6a86918053d1c3f/html5/thumbnails/55.jpg)