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2014 © Trivadis 
BASEL BERN BRUGG LAUSANNE ZUERICH DUESSELDORF FRANKFURT A.M. FREIBURG I.BR. HAMBURG MUNICH STUTTGART VIENNA 
ExadatawithIn-Memory Option –thebestofall ?!? 
Konrad HÄFELISenior Solution ManagerInfrastructure Engineering 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
1
2014 © Trivadis 
Trivadis ist führend bei der IT-Beratung, der Systemintegration, dem Solution-Engineering undder Erbringung von IT-Services mit Fokussierung auf und Technologien im D-A-CH-Raum. 
Unsere Leistungen erbringen wir aus den strategischen Geschäftsfeldern: Trivadis Services übernimmt den korrespondierenden BetriebIhrer IT Systeme. 
Unser Unternehmen 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
B E T R I E B 
2
2014 © Trivadis 
Mit über 600 IT-und Fachexperten bei Ihnen vor Ort 
3 
12 Trivadis Niederlassungen mitüber 600 Mitarbeitenden 
200 Service Level Agreements 
Mehr als 4'000 Trainingsteilnehmer 
Forschungs-und Entwicklungs- budget: CHF 5.0 Mio. / EUR 4.0 Mio. 
Finanziell unabhängig undnachhaltig profitabel 
Erfahrung aus mehr als 1'900 Projekten pro Jahr bei über 800 Kunden 
Stand 12/2013HamburgDüsseldorfFrankfurtFreiburgMünchenWienBaselZürichBernLausanne 
3Stuttgart 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
3 
Brugg
2014 © Trivadis 
In Memory Option on Exadata - the best of all?!? 
Trivadisan der DOAGEbene 3 -gleich neben der RolltreppeWir freuen uns auf Ihren Besuch. Denn mit Trivadisgewinnen Sie immer. 
DOAG-Konferenz 2014 
4
2014 © Trivadis 
A yearagoDOAG 2013… 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
5
2014 © Trivadis 
Chose anothertopic… Flash Cache 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
6
2014 © Trivadis 
… finalyin July2014 
Previews… 
Betas Versions 
Announcments: 10th ofJune 
Releasing22nd ofJuly 
12.1.0.2 fullrelease 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
7
2014 © Trivadis 
It’san option, isitworthit? 
On a normal Database Server? 
Hopefully, ifrequirementsaccordingly… 
But whataboutExadataDatabase Machine? 
Are the«expensive» Storage Server Feature 
Smart Scan 
Flash Cache 
a benefitforIMCS (In Memory ColumnStore) ? 
Resp. viceversa? 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
8
2014 © Trivadis 
AGENDA 
1.ExadataFeature 
2.In-Memory Overview 
3.In-Memory Configuration 
4.In-Memory Management 
5.In-Memory with ExadataTests 
6.Conclusion 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
9
2014 © Trivadis 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
ExadataFeature 
10
2014 © Trivadis 
ArchitectureFeatures Overview 
11 
Source: Oracle Corporation 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
Smart Scan Capabilities 
PredicateFiltering 
ColumnFiltering 
JoinProcessing 
Scans on encryptedData 
Scans on compressedData 
Create Tablespace – Storage Server formatsblocks 
Backup andRecovery –I/O forincrementalBackup ismuchmoreefficient, onlychangedBlocks arereturnedtoServer
2014 © Trivadis 
ExadataHybrid ColumnarCompression(HCC) 
12 
A compression unit is a logical structure spanning multiple DB blocks 
Each row is self-contained within a compression unit 
Data is organized by column during data load 
Each column is compressed separately 
Smart Scan is supported 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!?
2014 © Trivadis 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
In-Memory Overview 
13
2014 © Trivadis 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
14 
ColumnarStorage: ExampleforColumnorientation
2014 © Trivadis 
In-Memory Option –What is it ? 
Oracle Databases traditionally stores Data in Row Format 
Oracle Database In-Memory Option uses an In-Memory Column Store 
A new memory component in the SGA called In-Memory Area 
Data are stored in column format in the In-Memory Column Store (IMCS) 
Both Memory Structure (Buffer Cache and IMCS) will be populated 
Dual Format Architecture does not double the Memory requirement 
The Optimizer is fully aware about the In-Memory Column Store 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
15 
Source: Oracle
2014 © Trivadis 
In-Memory Option –Database Tiering 
With the In-Memory Area not all data must fit in Memory 
Less performance sensitive can reside on lower cost Disk 
IM Option acts transparently against the applications 
On Exadataacts on the top of all existing Storage tiers 
It is also fully compatible with the new Multitenant architecture 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
16 
Source: Oracle
2014 © Trivadis 
In-Memory Option –SIMD 
In-Memory Column Store are scanned with SIMD Vector Processing 
SIMD = Single Instruction Multiple Data 
SIMD Processing are evaluated in a single CPU Instruction 
IM Column Store are specifically designed to maximize the number of column entries that can be loaded into Vector Registers 
Theoretically Scan of billions of rows per second are possible 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
17
2014 © Trivadis 
Summary: Oracle Database In-Memory 
Extreme Performance: Analytics & OLTP 
Extreme Scale-Out & Scale-Up 
Extreme Availability 
Extreme Simplicity 
Powering the Real-Time Enterprise 
All In-Memory Benefits With No Application Changes 
In Memory Option on Exadata - the best of all?!? 
DOAG-Konferenz 2014 
18
2014 © Trivadis 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
In-Memory Configuration 
19
2014 © Trivadis 
In-Memory Option –The way to use it… 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
20 
On Exadatathere are some prerequisites… 
Storage Server 
Min. 12.1.1.1.0* 
RDBMS 
12.1.0.2 
Database Server 
Min. 12.1.1.1.0 
GridInfrastructure 
12.1.0.2 
* FullOffloadSupport for12.1.x RDBMS
2014 © Trivadis 
In-Memory Option –Configuration 
Configuration is very simple 
The Initializations ParametersINMEMORY_SIZE controls the In- Memory Area 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
21 
SQL> alter system set inmemory_size=16G scope=spfilesid=‘*’; 
SQL> select * from v$sga; 
NAME VALUE CON_ID 
--------------------------------------------- 
Fixed Size 5304248 0 
Variable Size 11274289224 0 
Database Buffers 108716359680 0 
Redo Buffers 263131136 0 
In-Memory Area 17179869184 0
2014 © Trivadis 
In-Memory Option –Configuration 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
22 
InitializationParameter 
Comment 
inmemory_clause_default 
enables you to specify a defaultIn-Memory Column Store (IM column store) clausefor new tables and materialized views 
inmemory_force 
allows you to specify whether tables and materialized view that are specified as INMEMORY are populatedinto the In-Memory Column Store or not 
inmemory_max_populate_servers 
specifies the maximum number of background populaserverste 
inmemory_query 
INMEMORY_QUERY is used to enable or disable in-memory queries for the entire database at the session or system level 
inmemory_size 
INMEMORY_SIZE sets the sizeof the In- Memory Column Store (IM column store) on a database instance 
inmemory_trickle_repopulate_servers_percent 
limitsthe maximum number of background populate servers used for In-Memory Column Store (IM column store) repopulation 
optimizer_inmemory_aware 
enables or disables all of the optimizer cost modelenhancements for in-memory
2014 © Trivadis 
In-Memory Option –Configuration 
Tables or Tablespace must be enabled to use IM ColumnnStore 
Depending on configuration the IMCS will be populated 
Activation at Tablespace and Table Level 
At Table Level configuration for compression and priority are possible 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
23
2014 © Trivadis 
In-Memory Option –Configuration 
Compression Types 
Priority Levels 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
24 
PriorityLevel 
Description 
Critical 
Objectsare populated immediately 
High 
Objects are populatedafter all critical objects are populated, if remains space 
Medium 
Objects are populatedafter all critical and high objects are populated, if remains space 
Low 
Objects are populatedafter all critical, high and medium objects are populated, if remains space 
None 
Objects arepopulated only after they are scanned 
CompressionType 
Description 
No Compress 
No Compression 
Memcompressfor DML 
Compression optimized for DML 
Memcompressfor Query Low 
Compressionoptimized for Query (default) 
Memcompressfor Query High 
Compression optimizedfor Query and Space saving 
Memcompressfor CapacityLow 
Compressionoptimized with orientation towards Space saving 
Memcompressfor CapacityHigh 
Compressionoptimized for Space saving
2014 © Trivadis 
In-Memory Option –Configuration 
Activation at Tablespace Level 
At Table Level configuration for compression and priority are possible 
memcompressfor query low and priority none are the default settings 
Table activation with compression and priority settings 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
25 
SQL> alter tablespaceSOE inmemory; 
SQL> alter table orders inmemory; 
SQL> alter table orders inmemorymemcompressfor query low priority critical;
2014 © Trivadis 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
In-Memory Management 
26
2014 © Trivadis 
In-Memory Option –Licensing 
License is need for using the In-Memory Option 
~ 18000 €/ per Processor 
The Option is installed with the RDBMS Installation, however not activated 
Bug 19308780 –Wrong Feature Tracking, fixed in PSU October 2014 
Very “lovely” discussion between Maria Colgan(Oracle IM Option Product Manager) and Kevin Closson(“independent” Oracle/Exadataspecialist)  
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
27
2014 © Trivadis 
In-Memory Option –Management 
Few v$ Views are in place for In-Memory Column Store management 
Not all v$ Views are documented (only red ones) 
New IM Memory Option PL/SQL Package 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
28 
SQL> descdbms_inmemory 
.. 
PROCEDURE DISABLEFASTSTART 
PROCEDURE ENABLEFASTSTART 
PROCEDURE POPULATE 
PROCEDURE REPOPULATE 
SQL> select table_namefrom dictwhere table_namelike 'V$IM_%'; TABLE_NAME------------------------------ 
V$IM_COLUMN_LEVELV$IM_COL_CUV$IM_HEADERV$IM_SEGMENTSV$IM_SEGMENTS_DETAILV$IM_SEG_EXT_MAPV$IM_SMU_CHUNKV$IM_SMU_HEADV$IM_TBS_EXT_MAPV$IM_USER_SEGMENTS 
OnlyV$ Views in redaredocumented 
OnlyProcedurein redaredocumented
2014 © Trivadis 
In-Memory Option –Management 
New dba_/all_/user_ views attribute are been implemented 
Monitoring of In-Memory Segment 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
29 
SQL> descuser_tables 
Name Null? Type 
----------------------------------------------------------------------------- 
TABLE_NAME NOT NULL VARCHAR2(128) 
. 
INMEMORY VARCHAR2(8) 
INMEMORY_PRIORITY VARCHAR2(8) 
INMEMORY_DISTRIBUTE VARCHAR2(15) 
INMEMORY_COMPRESSION VARCHAR2(17) 
INMEMORY_DUPLICATE VARCHAR2(13 
SQL> select owner, segment_name, segment_type, inmemory_size, bytes_not_populated, populate_statusfrom v$im_segments; 
OWNER SEGMENT_NAME SEGMENT_TYPE INMEMORY_SIZE BYTES_NOT_POPULATED POPULATE_ 
-------------------------------------------------------------------------------- 
EXA IM2 TABLE 1179648 0 COMPLETED 
EXA IM4 TABLE 8519680 0 COMPLETED
2014 © Trivadis 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
In-Memory with ExadataTests 
30
2014 © Trivadis 
147 MioRows, 10GB 
IM isfactor10 fasterthenjusBuffercache 
First populationofIM datafactor4 fasterwithoffloading 
80% offloadefficiency 
DedicatedQuery 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
31 
SQL> SELECT SUM(amount_sold) FROM sales; 
Cell 
offload_processing 
FALSE 
TRUE 
CACHE 
FALSE 
TRUE 
INMEMORY_QUERY 
DISABLE 
DISABLE 
DISABLE 
ENABLE 
ENABLE 
Elapsedtime 
56.82 
13.51 
1.17 
0.13 
013 
Factor 
1 
4 
48 
437 
437
2014 © Trivadis 
DedicatedQuery 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
32 
SQL> SELECT t.time_id, 
TO_CHAR(SUM(amount_sold), '9,999,999,999') AS sales, 
TO_CHAR(AVG(SUM(amount_sold)) 
over(ORDER BY t.time_idrange BETWEEN INTERVAL '2' DAY 
preceding AND INTERVAL '2' DAY following), '9,999,999,999') 
AS centered_5_day_avg 
FROM sales s, times t 
WHERE s.time_id= t.time_id 
GROUP BY t.time_id 
ORDER BY t.time_id; 
Cell 
offload_processing 
FALSE 
TRUE 
CACHE 
FALSE 
TRUE 
INMEMORY_QUERY 
DISABLE 
DISABLE 
DISABLE 
ENABLE 
ENABLE 
Elapsedtime 
01:30.14 
29.49 
05.95 
05.49 
05.48 
Factor 
1 
3 
15 
16 
16
2014 © Trivadis 
In-Memory Option –ExadataTest Enviroment 
Eighth Rack (2 DB Server –256 Gb RAM, 3 Storage Server) 
Swingbench(charbench) used as Benchmarking Tool (2 Min) 
OLTP Profile with 100 concurrent Users 
-60/40% Read/Write ratio 
DSS Profile with 16 concurrent Users 
-100/0% Read/Write ratio (Rollup and Cube Function) 
In-Memory Area with 16G Memory (SGA 128GB) 
All Columns of involved Tables (full Schema) are stored in the IM Column Store (~ 10GB) and populated 
Duplicate Feature intended for RAC Environment was not used 
This Feature should be considered in HA or Scalability Environments 
Our first steps in this way, was not so encouraging in terms of scalability DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
33
2014 © Trivadis 
In-Memory Option –Test Cases 
1.Smart Scan off, no In-Memory 
2.Smart Scan on, no In-Memory 
3.Smart Scan off, In-Memory compression “for DML” 
4.Smart Scan on, In-Memory compression “for DML” 
5.Smart Scan on, In-Memory compression “for query low” 
6.Smart Scan on, In-Memory compression “for query high” 
7.Smart Scan on, In-Memory compression “for capacity low” 
8.Smart Scan on, In-Memory compression “for capacity high” 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
34
2014 © Trivadis 
In-Memory Option –Test Results OLTP 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
35 
Total completed Transaction 
0 
20000 
40000 
60000 
80000 
100000 
120000 
140000 
160000 
180000 
Total Completed Transaction
2014 © Trivadis 
In-Memory Option –Test Results OLTP 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
36 
Average CPU Utilization 
0 
10 
20 
30 
40 
50 
60 
70 
80 
90 
Avg User CPU 
Avg Sys CPU 
CPU Usage
2014 © Trivadis 
Total completed Transaction 
0 
20000 
40000 
60000 
80000 
100000 
120000 
140000 
160000 
180000 
0 
10 
20 
30 
40 
50 
60 
70 
80 
90 
In-Memory Option –Test Results OLTP 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
37
2014 © Trivadis 
In-Memory Option –Test Results DSS 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
38 
Total completed Transaction (Reports) 
0 
20 
40 
60 
80 
100 
120 
Total Completed Transactions
2014 © Trivadis 
In-Memory Option –Test Results DSS 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
39 
Average CPU Utilization 
0 
10 
20 
30 
40 
50 
60 
Avg User CPU 
Avg Sys CPU 
CPU Usage
2014 © Trivadis 
0 
20 
40 
60 
80 
100 
120 
0 
10 
20 
30 
40 
50 
60 
In-Memory Option –Test Results DSS 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
40 
Total completed Transaction (Reports)
2014 © Trivadis 
In-Memory Option on Exadata–Result discussion 
OLTP 
factor12 :-o 
Nooffloadingdue tonodirectpathfunctionality 
All in cachewithhigh CPU load 
40% readprofitofIMCS 
OLTP lessCPU withIMCS due toSIMD benefit 
DSS 
NoOffloading/NoIMCS asfast but a lotofCPU BufferCache 
Offloading, asfast but lessCPU workdonein Storage Server 
IMCS 25% plus work, lessCPU 
The datasetandressourcesarenot in a goodbalancetotest 
Much moredataneeded 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
41
2014 © Trivadis 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
Conclusion 
42
2014 © Trivadis 
ExadataDatabase Machineworksfine 
Oracle IMCS Option worksfine 
Testingandinterpretationisnot trivial 
The optioncosts50% ofEE coreprice 
A seriousevaluationisneeded 
PoCtofind thebestofall, unlessyouneeda: 
In-Memory Option on Exadata–Conclusion 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
43
2014 © Trivadis 
Questions and answers ... 
BASEL BERN BRUGG LAUSANNE ZUERICH DUESSELDORF FRANKFURT A.M. FREIBURG I.BR. HAMBURG MUNICH STUTTGART VIENNA 
Konrad HÄFELI 
Tel: +41 58 459 59 69 
konrad.haefeli@trivadis.com 
DOAG-Konferenz 2014 
In Memory Option on Exadata - the best of all?!? 
44

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Doag 2014 konrad-haefeli_in-memory-option-on-exadata

  • 1. 2014 © Trivadis BASEL BERN BRUGG LAUSANNE ZUERICH DUESSELDORF FRANKFURT A.M. FREIBURG I.BR. HAMBURG MUNICH STUTTGART VIENNA ExadatawithIn-Memory Option –thebestofall ?!? Konrad HÄFELISenior Solution ManagerInfrastructure Engineering DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 1
  • 2. 2014 © Trivadis Trivadis ist führend bei der IT-Beratung, der Systemintegration, dem Solution-Engineering undder Erbringung von IT-Services mit Fokussierung auf und Technologien im D-A-CH-Raum. Unsere Leistungen erbringen wir aus den strategischen Geschäftsfeldern: Trivadis Services übernimmt den korrespondierenden BetriebIhrer IT Systeme. Unser Unternehmen DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? B E T R I E B 2
  • 3. 2014 © Trivadis Mit über 600 IT-und Fachexperten bei Ihnen vor Ort 3 12 Trivadis Niederlassungen mitüber 600 Mitarbeitenden 200 Service Level Agreements Mehr als 4'000 Trainingsteilnehmer Forschungs-und Entwicklungs- budget: CHF 5.0 Mio. / EUR 4.0 Mio. Finanziell unabhängig undnachhaltig profitabel Erfahrung aus mehr als 1'900 Projekten pro Jahr bei über 800 Kunden Stand 12/2013HamburgDüsseldorfFrankfurtFreiburgMünchenWienBaselZürichBernLausanne 3Stuttgart DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 3 Brugg
  • 4. 2014 © Trivadis In Memory Option on Exadata - the best of all?!? Trivadisan der DOAGEbene 3 -gleich neben der RolltreppeWir freuen uns auf Ihren Besuch. Denn mit Trivadisgewinnen Sie immer. DOAG-Konferenz 2014 4
  • 5. 2014 © Trivadis A yearagoDOAG 2013… DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 5
  • 6. 2014 © Trivadis Chose anothertopic… Flash Cache DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 6
  • 7. 2014 © Trivadis … finalyin July2014 Previews… Betas Versions Announcments: 10th ofJune Releasing22nd ofJuly 12.1.0.2 fullrelease DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 7
  • 8. 2014 © Trivadis It’san option, isitworthit? On a normal Database Server? Hopefully, ifrequirementsaccordingly… But whataboutExadataDatabase Machine? Are the«expensive» Storage Server Feature Smart Scan Flash Cache a benefitforIMCS (In Memory ColumnStore) ? Resp. viceversa? DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 8
  • 9. 2014 © Trivadis AGENDA 1.ExadataFeature 2.In-Memory Overview 3.In-Memory Configuration 4.In-Memory Management 5.In-Memory with ExadataTests 6.Conclusion DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 9
  • 10. 2014 © Trivadis DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? ExadataFeature 10
  • 11. 2014 © Trivadis ArchitectureFeatures Overview 11 Source: Oracle Corporation DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? Smart Scan Capabilities PredicateFiltering ColumnFiltering JoinProcessing Scans on encryptedData Scans on compressedData Create Tablespace – Storage Server formatsblocks Backup andRecovery –I/O forincrementalBackup ismuchmoreefficient, onlychangedBlocks arereturnedtoServer
  • 12. 2014 © Trivadis ExadataHybrid ColumnarCompression(HCC) 12 A compression unit is a logical structure spanning multiple DB blocks Each row is self-contained within a compression unit Data is organized by column during data load Each column is compressed separately Smart Scan is supported DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!?
  • 13. 2014 © Trivadis DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? In-Memory Overview 13
  • 14. 2014 © Trivadis DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 14 ColumnarStorage: ExampleforColumnorientation
  • 15. 2014 © Trivadis In-Memory Option –What is it ? Oracle Databases traditionally stores Data in Row Format Oracle Database In-Memory Option uses an In-Memory Column Store A new memory component in the SGA called In-Memory Area Data are stored in column format in the In-Memory Column Store (IMCS) Both Memory Structure (Buffer Cache and IMCS) will be populated Dual Format Architecture does not double the Memory requirement The Optimizer is fully aware about the In-Memory Column Store DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 15 Source: Oracle
  • 16. 2014 © Trivadis In-Memory Option –Database Tiering With the In-Memory Area not all data must fit in Memory Less performance sensitive can reside on lower cost Disk IM Option acts transparently against the applications On Exadataacts on the top of all existing Storage tiers It is also fully compatible with the new Multitenant architecture DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 16 Source: Oracle
  • 17. 2014 © Trivadis In-Memory Option –SIMD In-Memory Column Store are scanned with SIMD Vector Processing SIMD = Single Instruction Multiple Data SIMD Processing are evaluated in a single CPU Instruction IM Column Store are specifically designed to maximize the number of column entries that can be loaded into Vector Registers Theoretically Scan of billions of rows per second are possible DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 17
  • 18. 2014 © Trivadis Summary: Oracle Database In-Memory Extreme Performance: Analytics & OLTP Extreme Scale-Out & Scale-Up Extreme Availability Extreme Simplicity Powering the Real-Time Enterprise All In-Memory Benefits With No Application Changes In Memory Option on Exadata - the best of all?!? DOAG-Konferenz 2014 18
  • 19. 2014 © Trivadis DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? In-Memory Configuration 19
  • 20. 2014 © Trivadis In-Memory Option –The way to use it… DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 20 On Exadatathere are some prerequisites… Storage Server Min. 12.1.1.1.0* RDBMS 12.1.0.2 Database Server Min. 12.1.1.1.0 GridInfrastructure 12.1.0.2 * FullOffloadSupport for12.1.x RDBMS
  • 21. 2014 © Trivadis In-Memory Option –Configuration Configuration is very simple The Initializations ParametersINMEMORY_SIZE controls the In- Memory Area DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 21 SQL> alter system set inmemory_size=16G scope=spfilesid=‘*’; SQL> select * from v$sga; NAME VALUE CON_ID --------------------------------------------- Fixed Size 5304248 0 Variable Size 11274289224 0 Database Buffers 108716359680 0 Redo Buffers 263131136 0 In-Memory Area 17179869184 0
  • 22. 2014 © Trivadis In-Memory Option –Configuration DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 22 InitializationParameter Comment inmemory_clause_default enables you to specify a defaultIn-Memory Column Store (IM column store) clausefor new tables and materialized views inmemory_force allows you to specify whether tables and materialized view that are specified as INMEMORY are populatedinto the In-Memory Column Store or not inmemory_max_populate_servers specifies the maximum number of background populaserverste inmemory_query INMEMORY_QUERY is used to enable or disable in-memory queries for the entire database at the session or system level inmemory_size INMEMORY_SIZE sets the sizeof the In- Memory Column Store (IM column store) on a database instance inmemory_trickle_repopulate_servers_percent limitsthe maximum number of background populate servers used for In-Memory Column Store (IM column store) repopulation optimizer_inmemory_aware enables or disables all of the optimizer cost modelenhancements for in-memory
  • 23. 2014 © Trivadis In-Memory Option –Configuration Tables or Tablespace must be enabled to use IM ColumnnStore Depending on configuration the IMCS will be populated Activation at Tablespace and Table Level At Table Level configuration for compression and priority are possible DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 23
  • 24. 2014 © Trivadis In-Memory Option –Configuration Compression Types Priority Levels DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 24 PriorityLevel Description Critical Objectsare populated immediately High Objects are populatedafter all critical objects are populated, if remains space Medium Objects are populatedafter all critical and high objects are populated, if remains space Low Objects are populatedafter all critical, high and medium objects are populated, if remains space None Objects arepopulated only after they are scanned CompressionType Description No Compress No Compression Memcompressfor DML Compression optimized for DML Memcompressfor Query Low Compressionoptimized for Query (default) Memcompressfor Query High Compression optimizedfor Query and Space saving Memcompressfor CapacityLow Compressionoptimized with orientation towards Space saving Memcompressfor CapacityHigh Compressionoptimized for Space saving
  • 25. 2014 © Trivadis In-Memory Option –Configuration Activation at Tablespace Level At Table Level configuration for compression and priority are possible memcompressfor query low and priority none are the default settings Table activation with compression and priority settings DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 25 SQL> alter tablespaceSOE inmemory; SQL> alter table orders inmemory; SQL> alter table orders inmemorymemcompressfor query low priority critical;
  • 26. 2014 © Trivadis DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? In-Memory Management 26
  • 27. 2014 © Trivadis In-Memory Option –Licensing License is need for using the In-Memory Option ~ 18000 €/ per Processor The Option is installed with the RDBMS Installation, however not activated Bug 19308780 –Wrong Feature Tracking, fixed in PSU October 2014 Very “lovely” discussion between Maria Colgan(Oracle IM Option Product Manager) and Kevin Closson(“independent” Oracle/Exadataspecialist)  DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 27
  • 28. 2014 © Trivadis In-Memory Option –Management Few v$ Views are in place for In-Memory Column Store management Not all v$ Views are documented (only red ones) New IM Memory Option PL/SQL Package DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 28 SQL> descdbms_inmemory .. PROCEDURE DISABLEFASTSTART PROCEDURE ENABLEFASTSTART PROCEDURE POPULATE PROCEDURE REPOPULATE SQL> select table_namefrom dictwhere table_namelike 'V$IM_%'; TABLE_NAME------------------------------ V$IM_COLUMN_LEVELV$IM_COL_CUV$IM_HEADERV$IM_SEGMENTSV$IM_SEGMENTS_DETAILV$IM_SEG_EXT_MAPV$IM_SMU_CHUNKV$IM_SMU_HEADV$IM_TBS_EXT_MAPV$IM_USER_SEGMENTS OnlyV$ Views in redaredocumented OnlyProcedurein redaredocumented
  • 29. 2014 © Trivadis In-Memory Option –Management New dba_/all_/user_ views attribute are been implemented Monitoring of In-Memory Segment DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 29 SQL> descuser_tables Name Null? Type ----------------------------------------------------------------------------- TABLE_NAME NOT NULL VARCHAR2(128) . INMEMORY VARCHAR2(8) INMEMORY_PRIORITY VARCHAR2(8) INMEMORY_DISTRIBUTE VARCHAR2(15) INMEMORY_COMPRESSION VARCHAR2(17) INMEMORY_DUPLICATE VARCHAR2(13 SQL> select owner, segment_name, segment_type, inmemory_size, bytes_not_populated, populate_statusfrom v$im_segments; OWNER SEGMENT_NAME SEGMENT_TYPE INMEMORY_SIZE BYTES_NOT_POPULATED POPULATE_ -------------------------------------------------------------------------------- EXA IM2 TABLE 1179648 0 COMPLETED EXA IM4 TABLE 8519680 0 COMPLETED
  • 30. 2014 © Trivadis DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? In-Memory with ExadataTests 30
  • 31. 2014 © Trivadis 147 MioRows, 10GB IM isfactor10 fasterthenjusBuffercache First populationofIM datafactor4 fasterwithoffloading 80% offloadefficiency DedicatedQuery DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 31 SQL> SELECT SUM(amount_sold) FROM sales; Cell offload_processing FALSE TRUE CACHE FALSE TRUE INMEMORY_QUERY DISABLE DISABLE DISABLE ENABLE ENABLE Elapsedtime 56.82 13.51 1.17 0.13 013 Factor 1 4 48 437 437
  • 32. 2014 © Trivadis DedicatedQuery DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 32 SQL> SELECT t.time_id, TO_CHAR(SUM(amount_sold), '9,999,999,999') AS sales, TO_CHAR(AVG(SUM(amount_sold)) over(ORDER BY t.time_idrange BETWEEN INTERVAL '2' DAY preceding AND INTERVAL '2' DAY following), '9,999,999,999') AS centered_5_day_avg FROM sales s, times t WHERE s.time_id= t.time_id GROUP BY t.time_id ORDER BY t.time_id; Cell offload_processing FALSE TRUE CACHE FALSE TRUE INMEMORY_QUERY DISABLE DISABLE DISABLE ENABLE ENABLE Elapsedtime 01:30.14 29.49 05.95 05.49 05.48 Factor 1 3 15 16 16
  • 33. 2014 © Trivadis In-Memory Option –ExadataTest Enviroment Eighth Rack (2 DB Server –256 Gb RAM, 3 Storage Server) Swingbench(charbench) used as Benchmarking Tool (2 Min) OLTP Profile with 100 concurrent Users -60/40% Read/Write ratio DSS Profile with 16 concurrent Users -100/0% Read/Write ratio (Rollup and Cube Function) In-Memory Area with 16G Memory (SGA 128GB) All Columns of involved Tables (full Schema) are stored in the IM Column Store (~ 10GB) and populated Duplicate Feature intended for RAC Environment was not used This Feature should be considered in HA or Scalability Environments Our first steps in this way, was not so encouraging in terms of scalability DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 33
  • 34. 2014 © Trivadis In-Memory Option –Test Cases 1.Smart Scan off, no In-Memory 2.Smart Scan on, no In-Memory 3.Smart Scan off, In-Memory compression “for DML” 4.Smart Scan on, In-Memory compression “for DML” 5.Smart Scan on, In-Memory compression “for query low” 6.Smart Scan on, In-Memory compression “for query high” 7.Smart Scan on, In-Memory compression “for capacity low” 8.Smart Scan on, In-Memory compression “for capacity high” DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 34
  • 35. 2014 © Trivadis In-Memory Option –Test Results OLTP DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 35 Total completed Transaction 0 20000 40000 60000 80000 100000 120000 140000 160000 180000 Total Completed Transaction
  • 36. 2014 © Trivadis In-Memory Option –Test Results OLTP DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 36 Average CPU Utilization 0 10 20 30 40 50 60 70 80 90 Avg User CPU Avg Sys CPU CPU Usage
  • 37. 2014 © Trivadis Total completed Transaction 0 20000 40000 60000 80000 100000 120000 140000 160000 180000 0 10 20 30 40 50 60 70 80 90 In-Memory Option –Test Results OLTP DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 37
  • 38. 2014 © Trivadis In-Memory Option –Test Results DSS DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 38 Total completed Transaction (Reports) 0 20 40 60 80 100 120 Total Completed Transactions
  • 39. 2014 © Trivadis In-Memory Option –Test Results DSS DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 39 Average CPU Utilization 0 10 20 30 40 50 60 Avg User CPU Avg Sys CPU CPU Usage
  • 40. 2014 © Trivadis 0 20 40 60 80 100 120 0 10 20 30 40 50 60 In-Memory Option –Test Results DSS DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 40 Total completed Transaction (Reports)
  • 41. 2014 © Trivadis In-Memory Option on Exadata–Result discussion OLTP factor12 :-o Nooffloadingdue tonodirectpathfunctionality All in cachewithhigh CPU load 40% readprofitofIMCS OLTP lessCPU withIMCS due toSIMD benefit DSS NoOffloading/NoIMCS asfast but a lotofCPU BufferCache Offloading, asfast but lessCPU workdonein Storage Server IMCS 25% plus work, lessCPU The datasetandressourcesarenot in a goodbalancetotest Much moredataneeded DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 41
  • 42. 2014 © Trivadis DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? Conclusion 42
  • 43. 2014 © Trivadis ExadataDatabase Machineworksfine Oracle IMCS Option worksfine Testingandinterpretationisnot trivial The optioncosts50% ofEE coreprice A seriousevaluationisneeded PoCtofind thebestofall, unlessyouneeda: In-Memory Option on Exadata–Conclusion DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 43
  • 44. 2014 © Trivadis Questions and answers ... BASEL BERN BRUGG LAUSANNE ZUERICH DUESSELDORF FRANKFURT A.M. FREIBURG I.BR. HAMBURG MUNICH STUTTGART VIENNA Konrad HÄFELI Tel: +41 58 459 59 69 konrad.haefeli@trivadis.com DOAG-Konferenz 2014 In Memory Option on Exadata - the best of all?!? 44