awr warehouse
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About ebay inc and me (Samrat Roy)
ebay inc is a global commerce platform and paymen
•
Senior Engineer in ebay inc’s Database Engineerin
•
Working with Oracle Database for more than 10 ye
• Helped create and maintain the Custom AWR/DB m
database
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Production Environment
• Mostly 11g RAC, ASM and Exadata
•
One of the busiest OLTP database• 500+ database instances, from 10 – 130 TB each
• 5-10K processes per instance
• Execs 100K/sec, Redo 5-10MB/sec
•
Growing workload 40% year-on-year• EM 12c monitors 100+ db targets including 5 criticadatabases running payment system, user data app
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Business and DBA Requirement for custom AWR WBusiness Problem:
• Find and fix database performance degradation proactively and post upgrade
• Proactively add capacity (storage/compute) in a timely planned manner
• Compare application schemas between stage and production
which when translated to DBA problem statements and solutions :
• Monitor and capture W-o-W, (Week-over-Week) and M-o-M (Month-over-Month) deviation for DB metrics, ena
• W-o-W deviation weekly and on-demand
• SQL profiling for W-o-W deviation in execs, lio, pio, cpu, elapsed time
• Daily ASH trend for significant wait events and W-o-W comparison
• Daily W-o-W “Busy-ness” report from Time Model statistics for all databases
• Track storage growth to generate storage TTL (Time to Live), compute add or storage uplift for Primary as well
•
Follow GoldenGate trail from source to each downstream db• Schema comparison report between stage and production db
• Compare AWR data pre/post upgrade for new database wholly or partially (moving only few schemas)
Also answer DBA type questions for ongoing operations, for e.g:
• When table A was dropped, renamed or what column was added and when
• Table “busyness” by time of day for scheduling table maintenance across both Production and Active DataGua
• Compare Initialization parameter, patch, compute, storage between Current Primary and Switchover Target
•
Global Database Metadata: Version, Type, Role, CPU, Memory, Storage (Primary/Standby, etc.)
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Track health across all dbs W-o-W
Time Model Stats - WoW
========================================
DBNAME NAME PMDAY VALUE(Secs) % diff
PCT%
---------------- --------------------------- -------------------- ----------------------
DB_A_LIVE DB time 09-09-2014 TUESDAY 32182100 -49%
09-16-2014 TUESDAY 46089640 43%
09-23-2014 TUESDAY 55498930 20%
sql execute elapsed time 09-09-2014 TUESDAY 26196035 -50%
09-16-2014 TUESDAY 36871712 42%
09-23-2014 TUESDAY 49219127 31%
DB_B_LIVE DB time 09-09-2014 TUESDAY 43825650 2%
09-16-2014 TUESDAY 44263906 1%
09-23-2014 TUESDAY 43821266 -1%
sql execute elapsed time 09-09-2014 TUESDAY 35060520 3%
09-16-2014 TUESDAY 35411125 1%
09-23-2014 TUESDAY 35410117 -0.1%
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Track top waits and SQL profile across all d
SQL Profile Trend report - WoW==============================
DBNAME DAY SQL_ID Ex% Buf% Elp% Cpu% Phy% Ex# Buf# P-------------------------- --------------- ----- ---- ------- ------- --------
DB_A_LIVE 09-09-2014 TUE dktb2hv6v9d46 .30 3.27 2.39 2.40 3.74 82 1
fbhuck3ryu014 1.79 2.89 1.92 1.67 1.15 6 2 1
09-16-2014 TUE 1kuyk21zwn1ac 9.50 9.01 15.02 9.37 8.00 9 1
dktb2hv6v9d46 .50 4.10 3.89 3.20 4.54 83 3
DBNAME EVENT_NAME time:HH WAITTIME WAITPCT---------------- ------------------------------- ------------ --- --------------------------------- ---------DB_A_LIVE enq: TX - row lock contention 09-SEP-2014 TUE 5943 23%
16-SEP-2014 TUE 41771 68%23-SEP-2014 TUE 80101 92%
Streams miscellaneous event 09-SEP-2014 TUE 18358 71%
16-SEP-2014 TUE 17956 29%
DBNAME EVENT_NAME time:HH WAITTIME WAITPCT
---------------- -------------------------------------------- --------------- ------------------------------DB_B_LIVE db file sequential read 09-SEP-2014 TUE 40 6%
16-SEP-2014 TUE 32 3%
23-SEP-2014 TUE 28 5%
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Further drill down on sql_id
Turns out SQL is a “SELECT-FOR-UPDATE” causing high enqueue waits impacting oveexecute elapsed time and higher CPU time
@sqlbyid
Enter value for sql_id : 1kuyk21zwn1ac
/* sample sql for sql_id 1kuyk21zwn1ac*/SELECT * from A FOR UPDATE;
SNAP_ID DBNAME EXECS_DELTA AVG_BG AVG_IO AVG_ROW•
---------- ------------------------------ ----------- ---------- ---------- ---------------------------------------
118140 DB_A_LIVE 9256 100.4 .7 7.6
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Future
• OEM AWR Warehouse being considered
• May use for performance tracking and integrated dashboard
•
Will need to extend the AWR Warehouse for functionality like ADG performanc
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