using oracle rdb partitioned lock trees€¦ · 12/04/2006 · 204003b2:1 12:39:32.74 w waiting...
TRANSCRIPT
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Using Oracle RdbPartitioned Lock Trees
Using Oracle RdbPartitioned Lock Trees
Norman LastovicaOracle Rdb Engineering
November 13, 06
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Agenda
• Locking Review
• Partitioned Lock Trees in OpenVMS Clusters
• Performance tests
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Disclaimers
• Tests represented are not strictly scientific
• Shared SAN storage performance is impactedby every IO from every system connected
• Different systems, versions, storage yielddifferent results
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VMS Distributed Lock Manager
• Used by cooperating applications
• Manages “locks” on “resources”
• Resources & Sub Resources organized in trees
• Cluster transparent
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Lock Trees
• Database lock is root resource• Contains root file DEVID+FILID
Page1 Page177
Area1
Page53 Page88
Record Record
Logical Area
Area2
Page88 Page94
Area3
DB
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Remote Locking
• Tree is “mastered” on one node in cluster• Access to tree from master node is “local”• Access from other nodes is “remote”
• Master node is first established on node where rootlock is created (ie, where database is first opened)
• Dynamic lock remastering• VMS moves tree to system with most activity• Be aware of “bouncing”• Can be disabled
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Remote vs. LocalRequest Latency
149
187
5
157
4
186
3
156141
0
50
100
150
200
mic
rose
cond
s
GS1280 rx8620 1.6 rx4640 1.1
GS1280
rx8620 1.6
rx4640 1.1
GS1280rx8620 1.6rx4640 1.1
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Rdb Partitioned Lock Trees
• One tree per area• Root lock name contains area DEVID+FILID
• Database tree for non-area resources• Allows area trees to be mastered on different
nodes to reduce remote locking
Page1 Page177 Page422
Area1
Area1Root
Page61 Page177 Page859
Area2
Area2Root
OtherStuff
DB
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Partitioned Lock TreePage Locks & ALG
PLN PLN PLN
Level -110 Pages
Level -2100 Pages
Level -31000 Pages
PLN PLN
Level -110 Pages
Level -2100 Pages
Level -31000 Pages
Logical Area
PLN
Level -1
Level -2
Level -3
Logical Area
Page Page
Physical Area
Root Area
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Rdb Partitioned Lock Trees
• Most helpful when application access can bebiased by node/area
• Offline database modification
•ALTER DATABASE FILE …LOCK PARTITIONING IS ENABLED
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Test Environment
• Cluster of two rx4640 (& an ES40 not used)• 100mb Ethernet interconnect• EVA3000 storage with V8.2-1 & Rdb 7.2.0.1
+--------------------------------------------------------+---------+| SYSTEMS | MEMBERS |+--------+--------------------------------+--------------+---------+| NODE | HW_TYPE | SOFTWARE | STATUS |+--------+--------------------------------+--------------+---------+| SAGAN | HP rx4640 (1.50GHz/6.0MB) | VMS V8.2-1 | MEMBER || WELLS | HP rx4640 (1.50GHz/6.0MB) | VMS V8.2-1 | MEMBER || MONGO | AlphaServer ES40 | VMS F8.3 | MEMBER |+--------+--------------------------------+--------------+---------+
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Test Database
• 100 Storage areas
• 100 Tables & 100 indexes
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Populating Database
• “Even” areas/tables/indexes on WELLS
• “Odd” areas/tables/indexes on SAGAN
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Populating DatabaseWaiting for Page 1:x?
Node: SAGAN (1/2/2) Oracle Rdb V7.2-010 Perf. Monitor 12-APR-2006 12:39:34.87Rate: 3.00 Seconds Active User Stall Messages Elapsed: 00:05:46.69Page: 1 of 1 DISK$RDBTEST_SYS1:[BIGDB]BIGDB.RDB;1 Mode: Online--------------------------------------------------------------------------------Process.ID Since...... T Stall.reason.............................Lock.ID.204003B2:1 12:39:32.74 W waiting for page 1:1497 (PW) 09013F34204003B1:1 12:39:32.89 W waiting for page 1:852 (PW) 0900AAE4204003B3:1 12:39:23.87 W waiting for page 1:852 (PW) 08011E27204003B0:1 12:39:32.84 W waiting for page 1:852 (PW) 0B013151204003AB:1 12:39:32.76 W waiting for page 1:1495 (PW) 0A012271204003B4:1 12:39:23.84 W waiting for page 1:852 (PW) 080138CF204003AD:1 12:39:32.74 W waiting for page 72:598 (PW) 080150E3204003B5:1 12:39:24.07 W waiting for page 1:853 (PW) 08011FB4204003AE:1 12:39:32.90 W waiting for page 1:851 (PW) 1900DAB2204003AF:1 12:39:32.88 W waiting for page 1:851 (PW) 0A01333D
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Reduce Contention
• Reduce RDB$SYSTEM page size to 2 blocks?
• Disable cardinality collection
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Populating DatabasePLT disabled
DISTRIBUTED LOCK MANAGEMENT STATISTICS on node WELLS 12-APR-2006 12:37:04.67
CUR AVE MIN MAX
New ENQ Rate (Local) 2511.88 609.09 0.00 3341.84 (Incoming) 2396.55 547.69 0.00 3066.52 (Outgoing) 2.66 1.30 0.00 18.33 Converted ENQ Rate (Local) 2574.21 838.49 0.00 4834.77 (Incoming) 4388.13 878.33 0.00 6353.37 (Outgoing) 0.00 0.00 0.00 0.00 DEQ Rate (Local) 2146.90 508.51 0.00 3015.52 (Incoming) 2258.56 452.32 0.00 3248.85 (Outgoing) 2.66 1.30 0.00 18.33 Blocking AST Rate (Local) 269.65 132.94 0.00 740.96 (Incoming) 0.00 0.00 0.00 0.00 (Outgoing) 838.96 159.62 0.00 1465.59 Dir Functn Rate (Incoming) 164.99 73.30 8.33 282.98 (Outgoing) 0.00 4.21 0.00 95.66 Deadlock Message Rate 1.33 4.89 0.99 15.33
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Records Stored, PLT Disabled
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Populating DatabasePLT enabled
DISTRIBUTED LOCK MANAGEMENT STATISTICS on node WELLS 12-APR-2006 12:08:41.72
CUR AVE MIN MAX
New ENQ Rate (Local) 2056.90 1416.90 0.99 2166.90 (Incoming) 355.98 195.52 13.99 479.31 (Outgoing) 644.97 316.35 8.66 703.30 Converted ENQ Rate (Local) 1913.24 1548.52 4.33 2688.87 (Incoming) 344.31 281.95 19.99 484.97 (Outgoing) 275.32 124.69 2.33 275.32 DEQ Rate (Local) 2358.22 1432.23 0.00 2610.21 (Incoming) 106.66 123.32 3.33 440.64 (Outgoing) 425.31 236.32 0.00 514.30 Blocking AST Rate (Local) 51.33 75.59 2.99 201.65 (Incoming) 28.66 19.46 0.33 38.99 (Outgoing) 56.33 79.29 1.99 179.99 Dir Functn Rate (Incoming) 184.65 139.96 28.66 316.65 (Outgoing) 63.99 24.06 0.00 78.32 Deadlock Message Rate 1.66 3.59 1.66 9.66
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Record Stores, PLT Enabled
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Test OLTP Workload
• 1 User per table/area/index
• Update 100 random records per transaction
• 8 Users per system
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WorkloadPLT Disabled – From WELLS
DISTRIBUTED LOCK MANAGEMENT STATISTICS on node WELLS 12-APR-2006 15:42:00.04
CUR AVE MIN MAX
New ENQ Rate (Local) 6609.94 6273.02 4389.90 8027.90 (Incoming) 4402.19 4286.60 2819.92 5520.37 (Outgoing) 0.66 1.40 0.00 4.64 Converted ENQ Rate (Local) 2583.85 2452.34 1722.03 3129.22 (Incoming) 1724.56 1673.39 1100.87 2165.90 (Outgoing) 0.00 0.00 0.00 0.00 DEQ Rate (Local) 6608.95 6273.02 4388.58 8027.90 (Incoming) 4401.86 4286.56 2818.59 5520.70 (Outgoing) 0.66 1.40 0.00 4.64 Blocking AST Rate (Local) 57.52 52.22 34.92 68.85 (Incoming) 0.00 0.00 0.00 0.00 (Outgoing) 40.23 41.80 27.61 59.21 Dir Functn Rate (Incoming) 124.37 52.50 7.97 193.87 (Outgoing) 0.00 0.00 0.00 0.00 Deadlock Message Rate 0.00 0.00 0.00 0.00
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WorkloadPLT Disabled – From SAGAN
DISTRIBUTED LOCK MANAGEMENT STATISTICS on node SAGAN 12-APR-2006 15:43:55.87
CUR AVE MIN MAX
New ENQ Rate (Local) 10.97 28.59 10.97 46.22 (Incoming) 1.33 1.33 1.33 1.33 (Outgoing) 5683.14 4933.59 4184.04 5683.14 Converted ENQ Rate (Local) 15.96 53.70 15.96 91.44 (Incoming) 0.00 0.00 0.00 0.00 (Outgoing) 2234.68 1932.23 1629.78 2234.68 DEQ Rate (Local) 10.97 28.59 10.97 46.22 (Incoming) 1.33 1.33 1.33 1.33 (Outgoing) 5681.81 4932.76 4183.71 5681.81 Blocking AST Rate (Local) 0.00 0.00 0.00 0.00 (Incoming) 63.51 51.54 39.57 63.51 (Outgoing) 0.00 0.00 0.00 0.00 Dir Functn Rate (Incoming) 26.60 22.28 17.95 26.60 (Outgoing) 0.00 0.00 0.00 0.00 Deadlock Message Rate 0.00 0.00 0.00 0.00
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TPS, PLT Disabled
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Enable PLT
SQL> ALTER DATABASE FILE X$LOCK PARTION ENABLE;
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WorkloadPLT Enabled
DISTRIBUTED LOCK MANAGEMENT STATISTICS on node WELLS 12-APR-2006 16:00:08.67
CUR AVE MIN MAX
New ENQ Rate (Local) 6065.90 5907.35 4483.66 6776.87 (Incoming) 121.71 35.38 0.99 121.71 (Outgoing) 0.33 1.72 0.33 3.65 Converted ENQ Rate (Local) 2426.89 2333.36 1750.50 2661.33 (Incoming) 205.17 180.35 152.30 205.17 (Outgoing) 0.00 0.00 0.00 0.00 DEQ Rate (Local) 6063.90 5907.35 4483.33 6776.87 (Incoming) 116.38 34.18 0.99 116.38 (Outgoing) 0.33 1.72 0.33 3.65 Blocking AST Rate (Local) 62.18 51.93 46.22 62.18 (Incoming) 0.00 0.00 0.00 0.00 (Outgoing) 68.17 60.85 46.22 68.17 Dir Functn Rate (Incoming) 67.50 72.68 17.29 165.27 (Outgoing) 0.00 0.00 0.00 0.00 Deadlock Message Rate 0.00 0.00 0.00 0.00
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WorkloadPLT Enabled – From SAGAN
DISTRIBUTED LOCK MANAGEMENT STATISTICS on node SAGAN 12-APR-2006 16:00:53.32
CUR AVE MIN MAX
New ENQ Rate (Local) 7163.50 6016.79 4735.33 8649.06 (Incoming) 250.31 82.80 4.99 250.31 (Outgoing) 4.66 1.06 0.00 4.66 Converted ENQ Rate (Local) 2581.82 2181.64 1711.88 3126.11 (Incoming) 0.00 0.00 0.00 0.00 (Outgoing) 224.31 183.67 151.32 255.31 DEQ Rate (Local) 7162.50 6016.76 4733.66 8648.40 (Incoming) 250.98 85.57 7.33 250.98 (Outgoing) 4.66 1.06 0.00 4.66 Blocking AST Rate (Local) 0.00 0.00 0.00 0.00 (Incoming) 76.66 63.62 52.99 87.32 (Outgoing) 0.00 0.00 0.00 0.00 Dir Functn Rate (Incoming) 302.97 132.57 42.99 382.30 (Outgoing) 0.00 0.00 0.00 0.00 Deadlock Message Rate 0.00 0.00 0.00 0.00
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TPS, PLT Enabled
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Where PLT May Help Most
• Mostly segregated workload by area by node
• Mostly RW or long RO transactions
• More cluster nodes to distribute among
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Where PLT MayNot Help As Much
• Lots of short RO transactions• Root/TSNBLK access dominates
• Workload difficult/impossible to partition
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Considerations
• Evaluate use of• PE1• LOCKDIRWT• LOCKRMWT
• Faster cluster interconnects
• Faster storage (quicker IO = less time locksare held)
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[email protected]://www.oracle.com/rdb
Q&AA N S W E R SA N S W E R SQ U E S T I O N SQ U E S T I O N S
With ThanksKevin JenkinsGreg Jordan
Christian MoserPaul MeadJeff JalbertKeith Hare