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TURKCELL DBAs Metin YILMAZ & Ferhat ŞENGÖNÜL TURKCELLs EXADATA Journey September 2010 ORACLE RACK Pack Team Sanjay SINGH S316103 : Life with the Sun Oracle.

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Presentation on theme: "TURKCELL DBAs Metin YILMAZ & Ferhat ŞENGÖNÜL TURKCELLs EXADATA Journey September 2010 ORACLE RACK Pack Team Sanjay SINGH S316103 : Life with the Sun Oracle."— Presentation transcript:

1 TURKCELL DBAs Metin YILMAZ & Ferhat ŞENGÖNÜL TURKCELLs EXADATA Journey September 2010 ORACLE RACK Pack Team Sanjay SINGH S316103 : Life with the Sun Oracle Database Machine v2

2 Turkcell Bio Leading Telco in Turkey 33.9 million subscribers in Turkey as of June 30, 2010 Third biggest GSM operator in Europe in terms of subscribers Turkcell started its operations in February 1994 Turkcell co-operates in 8 other countries and has over 60 million subscribers total First and only Turkish company listed on NYSE Over 500 Oracle Databases, 150+ Production DB Machine hosts our biggest Database from DWH Domain

3 Overview Turkcells largest 100 TB (~250 TB uncompressed) DB was migrated to DBM v2, now only 25 TB with the help of HCC on Full SAS Rack There are over 50K reports run every month on this DB, Performance improvement up-to 400x, average 10x Ability to scale linearly: add one more Rack and forget

4 Business Drivers - Why Exadata ? OLD SYSTEMNEW SYSTEM Server ModelSun M9000Oracle Exadata V2 Cpu TypeSun Sparc 7 2.52 GHzXeon® E5540 Processors 2.53 GHz Number Of Cpu Threads176128 Total Main Memory512 GB576 GB Total Storage Capacity120 TB30 TB Storage Connection TechnologyFiber Channel (32 x 4 Gtbit/s)Infiniband ( 8 x 40 Gbit Storage Maximum IO Throughput Capacity5 GB/s21 GB/s Server + Storage units Total Power57 KVA20 KVA Server + Storage units Total Form Factor 11 Rack1 Rack Approximate Data Backup Duration44 Hours14 Hours Number of Backup Tape Cartridges Per Backup15957

5 Business Drivers - Why Exadata ? Simplified Architecture Full Rack replaces Sun M9000 & ten(10) Storage Cabinets Single Vendor Strategy It took Turkcell a few years to perfect current environment – Exadata up & running in 5 days We need to address/deal with one party if a problem occurs Effortless Scalability: one to Multi-Rack Data volume explodes – data size doubles every year (45TB to 100TB) Old storage environment was maxed out – no chance to scale out Old env 600+ (EMC DMX4 & Hitatchi USP-V) disks with max I/O throughput of 5 GB/sec. vs 168 SAS disks with a max I/O throughput of 21 GB/sec.

6 Business Drivers - Why Exadata ? Avg Time Exadata Migration Performance Needs There over 50K reports run every month on this DB Average report run time is reduced from 27 minutes to 3 minutes !!! Reports completed less than 5 mins went from %45 to %90 Reports running more than 4 hours went from 87 to 1

7 The Project Overview Planned as simple migration No Application version or interface changes Migrate to new Exadata V2 machine Upgrade to new Oracle Version (from 10.2.0.4 to 11.2.0.1) Move from Single Instance to RAC 4 Months (Apr-July) testing of all the components Crash Tests (working closely with support) Network Transfer Speed Tests (10G vs IB) Backup/Restore Tests Performance Tests (RAT, Report run times, data load times)

8 Turkcells BI Environment Reporting MSTR ETL AB Initio Oracle ODI Source DBs Exadata Other DWH DBs Amount Of Data 1.5 Billion CDR per Day 600 -1000 GB raw data extracted from 20+ source database 5 TB Data on file system processed 2-3 TB loaded into databases, mostly into Exadata Approximately 500 TB Customer data stored in multiple Databases 250 TB (25 TB compressed) on Exadata, 250 TB (100 TB compressed) on non-Exadata

9 Turkcells BI Environment – Application Footprint ETL Environment AB Initio – runs on Sun E25K and 8 Node Linux Cluster Data loaded daily between 19:00 - 08:00 (SLA) Sql*Loader used to load tables with 16 parallel threads Reporting Environment MSTR (Microstrategy) is used mostly 300+ Users 3000 distinct reports with 50k run per month Runs between 08:00 – 20:00 (SLA)

10 Project Challenges Will we fit into 30 TB ? (~100 TB 10g compressed) How to move that much data in 2 days ? 100TB 10g compressed, how much of it can be moved before/after How much data needs to be moved during mig window What kind of Network infrastructure is needed to support such xfr rate 8-node RAC ? (earlier attempts to use RAC did not go through) Training needs for RAC and exadata storage architecture Rollback plan: Parallel run (load data to both DB) Environment

11 Migration Facts Insert/append over DB Links Platform and version change forced us to use insert over db-link None of the other methods like TTS, ASM Rebalance was applicable Used in-house pl/sql utility to perform migration Metadata (Tablespaces were re-organized) Insert/Append with 128 parallel sessions partition-wise 40TB data was transferred during the migration window Transfer rate 300mB/sec, around 1 TB per hour approximately Completed in 36 hours. High CPU load on comp nodes because of HCC (expected) SQL*Net compressing the data 2-3x (this was a nice finding) 20 TB readonly data was transferred before, ~30TB after Network Infrastructure 10Gb-to-IB (Voltaire 4036E) gateway used to connect old system

12 Migration Facts After the test migration we ended-up staying on Exadata End users were so happy, they did not let us go back 3 Weeks before the go-live date we were live Parallel runs continued for few weeks until we completely feel comfortable on Exadata Stability of the system under real load was proved for various load patterns Backup/Restore tests were completed Questions on Migration ?

13 Compression in Action Old System 10gR2 Compression ~2-3 times ~250TB raw data to 100TB Exadata V2 with EHCC Raw Data 250TB to 25TB (Data)+ 5TB (Temp) = 30TB EHCC - Compress ratio ~7-10x Archive compression is efficient but high CPU consumption http://ferhatsengonul.wordpress.com/2010/08/09/getting-the-most-from-hybrid-columnar-compression/ SORTCOMPRESSSIZE (GB)RATIO NOSORTNOCOMP137,591 NOSORTQ_HIGH21,216,48 SORT_AQ_HIGH12,1811,29 SORT_BQ_HIGH15,378,95 SORT_A_BQ_HIGH11,6411,80

14 Performance Gains Report NameOld SystemExadataby…X CRC Control Report0:15:48.730:05:06.07X2 prepaid bireysel toplam harcanan kontor tl8:02:10.591:51:33.20X4.3 eom_equipment_utilization report 0:38:17.77 0:00:23.34 X163 Eom equipment arpu report 0:09:46.25 0:02:08.00 X4.5 Son 10 gun icinde yapilan gonderimler0:17:57.95 0:00:37.61 X45.7 Rapor 01. Satış Kanalı Kırılımında Blackberry 0:03:22.24 0:00:00.66 X487 İnternet Paketleri Postpaid paketiçi ve paket 0:05:41.34 0:01:00.34 X4.3 Connectcard Fatura tutarları 0:31:32.38 0:00:46.51 X66.3 Connectcard Aktivasyon 0:25:21.00 0:00:54.88 X44.9 There over 50K reports run every month Performance improvement is up-to 400x for some reports and on average it is 10x

15 Life with Exadata No need to be scared about RAC We use scan-IP, rest is assured: loads are distributed over the nodes We use heavily PQ; so far no problems running slaves over multiple nodes. Tons of log files could be a little overwhelming for troubleshooting Temporary Tablespace should be at least twice as more DB Machine is indeed redundant We lost entire cell or individual hard disk or flash disk but database stayed up, no interruptions for the service Enterprise Manager is must Grid Control SQL Monitor

16 Implementation Challenges Hardware Failure Sun: issues with failed IB switch - all node hung. Faulty switch replaced Hanging due to configuration setup of switch Disk Failure – no down time, everything continuing working Disk replaced online – just replaced all taken care automaticaly Issues work in progress Cannot explain why cell encountered root filesystem readonly Bug: 9752748 Not all the Instances are registered with the scan-vip after re-cycle listeners Registers after a few hours. No impact when partly registered.

17 Implementation Challenges SQL Loader session hangs on enq ST contention Bug9772225 – ST enqueue acquisition issue - Complex fix in review Bug9326041 - Buffer pre-warm issue W/A: _db_cache_pre_warm=FALSE Exadata problem ORA-07445: core dump [kdzdcol_skip_slots()] Bug 9655552 – EHCC optimization issues – W/A : _arch_comp_dbg_scan"=16 RS-7445 [Serv MS absent] Bug 9252694 MS FREQUENTLY REPORTS LOW VIRTUAL HEAP MEMORY AND SHUTS DOWN - Fixed 11.2.1.3.X9252694 bug 9217088 : using memcpy (on cell nodes) Disable chained row optimization in Exadata bug.9338087 is fixed in 11.2.1.2.4

18 User Feedbacks We heard before that infrastructure changes would give us performance gains but this time we were surprised with it, it was well over our expectations. Now we can take faster actions in this competitive environment. Director of Marketing Department XDDS is fantastic in a single word, none of the reports take more than 10 minutes, It was taking 3-4 hours before now it completes in 3 minutes. It sounds like un-real but it is real. Power end-user from Finance Department It was a never ending race to match the business' performance and capacity needs. With the Database Machine V2, we have outperformed our user's expectations and we are prepared for the future growth. Veteran System Admin You started to scare me MSTR updated her status on facebook. End-user from Marketing Department

19 What is waiting for the future Adding second Rack Well see if it will scale :) Partition nodes for test/dev purposes Several more DWH Databases could be consolidated into another full Rack Evaluate Exadata for OLTP Environments Real-Time DWH

20 I would like to Thank here to Turkcells DB and OS Admins for completing migration before its planned date and keeping it running successfully Oracle RAC Pack Team: Sanjay, Su, Martina Oracle DWH Global Leaders Team: Cemil, Reiner Oracle Turkeys local Sales Support and Support Organization

21 Thank YOU Questions www.turkcell.com.tr Ferhat ŞENGÖNÜL ferhat.sengonul@turkcell.com.tr


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