Using Oracle Rdb Partitioned Lock Trees. Norman Lastovica Oracle Rdb Engineering November 13, 06
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1 Using Oracle Rdb Partitioned Lock Trees Norman Lastovica Oracle Rdb Engineering November 13, 06
2 Agenda Locking Review Partitioned Lock Trees in OpenVMS Clusters Performance tests 2
3 Disclaimers Tests represented are not strictly scientific Shared SAN storage performance is impacted by every IO from every system connected Different systems, versions, storage yield different results 3
4 VMS Distributed Lock Manager Used by cooperating applications Manages locks on resources Resources & Sub Resources organized in trees Cluster transparent 4
5 Lock Trees Database lock is root resource Contains root file DEVID+FILID DB Area1 Area2 Area3 Page1 Page177 Page53 Page88 Logical Area Page88 Page94 Record Record 5
6 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 root lock 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 6
7 Remote vs. Local Request Latency 187 microseconds GS1280 rx rx rx rx GS1280 GS1280 rx rx
8 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 Area1Root Area2Root DB Area1 Area2 Page1 Page177 Page422 Page61 Page177 Page859 OtherStuff 8
9 Partitioned Lock Tree Page Locks & ALG Root Area Logical Area Logical Area Physical Area Level Pages Level Pages Level -3 Page Page Level Pages Level Pages Level -2 Level Pages Level Pages Level -1 PLN PLN PLN PLN PLN PLN 9
10 Rdb Partitioned Lock Trees Most helpful when application access can be biased by node/area Offline database modification ALTER DATABASE FILE LOCK PARTITIONING IS ENABLED 10
11 Test Environment Cluster of two rx4640 (& an ES40 not used) 100mb Ethernet interconnect EVA3000 storage with V8.2-1 & Rdb 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
12 Test Database 100 Storage areas 100 Tables & 100 indexes 12
13 Populating Database Even areas/tables/indexes on WELLS Odd areas/tables/indexes on SAGAN 13
14 Populating Database Waiting for Page 1:x? Node: SAGAN (1/2/2) Oracle Rdb V Perf. Monitor 12-APR :39:34.87 Rate: 3.00 Seconds Active User Stall Messages Elapsed: 00:05:46.69 Page: 1 of 1 DISK$RDBTEST_SYS1:[BIGDB]BIGDB.RDB;1 Mode: Online Process.ID Since... T Stall.reason...Lock.ID B2:1 12:39:32.74 W waiting for page 1:1497 (PW) 09013F B1:1 12:39:32.89 W waiting for page 1:852 (PW) 0900AAE B3:1 12:39:23.87 W waiting for page 1:852 (PW) 08011E B0:1 12:39:32.84 W waiting for page 1:852 (PW) 0B AB:1 12:39:32.76 W waiting for page 1:1495 (PW) 0A B4:1 12:39:23.84 W waiting for page 1:852 (PW) CF AD:1 12:39:32.74 W waiting for page 72:598 (PW) E B5:1 12:39:24.07 W waiting for page 1:853 (PW) 08011FB AE:1 12:39:32.90 W waiting for page 1:851 (PW) 1900DAB AF:1 12:39:32.88 W waiting for page 1:851 (PW) 0A01333D 14
15 Reduce Contention Reduce RDB$SYSTEM page size to 2 blocks? Disable cardinality collection 15
16 Populating Database PLT disabled DISTRIBUTED LOCK MANAGEMENT STATISTICS on node WELLS 12-APR :37:04.67 CUR AVE MIN MAX New ENQ Rate (Local) (Incoming) (Outgoing) Converted ENQ Rate (Local) (Incoming) (Outgoing) DEQ Rate (Local) (Incoming) (Outgoing) Blocking AST Rate (Local) (Incoming) (Outgoing) Dir Functn Rate (Incoming) (Outgoing) Deadlock Message Rate
17 17 Records Stored, PLT Disabled
18 Populating Database PLT enabled DISTRIBUTED LOCK MANAGEMENT STATISTICS on node WELLS 12-APR :08:41.72 CUR AVE MIN MAX New ENQ Rate (Local) (Incoming) (Outgoing) Converted ENQ Rate (Local) (Incoming) (Outgoing) DEQ Rate (Local) (Incoming) (Outgoing) Blocking AST Rate (Local) (Incoming) (Outgoing) Dir Functn Rate (Incoming) (Outgoing) Deadlock Message Rate
19 19 Record Stores, PLT Enabled
20 Test OLTP Workload 1 User per table/area/index Update 100 random records per transaction 8 Users per system 20
21 Workload PLT Disabled From WELLS DISTRIBUTED LOCK MANAGEMENT STATISTICS on node WELLS 12-APR :42:00.04 CUR AVE MIN MAX New ENQ Rate (Local) (Incoming) (Outgoing) Converted ENQ Rate (Local) (Incoming) (Outgoing) DEQ Rate (Local) (Incoming) (Outgoing) Blocking AST Rate (Local) (Incoming) (Outgoing) Dir Functn Rate (Incoming) (Outgoing) Deadlock Message Rate
22 Workload PLT Disabled From SAGAN DISTRIBUTED LOCK MANAGEMENT STATISTICS on node SAGAN 12-APR :43:55.87 CUR AVE MIN MAX New ENQ Rate (Local) (Incoming) (Outgoing) Converted ENQ Rate (Local) (Incoming) (Outgoing) DEQ Rate (Local) (Incoming) (Outgoing) Blocking AST Rate (Local) (Incoming) (Outgoing) Dir Functn Rate (Incoming) (Outgoing) Deadlock Message Rate
23 23 TPS, PLT Disabled
24 Enable PLT SQL> ALTER DATABASE FILE X$ LOCK PARTION ENABLE; 24
25 Workload PLT Enabled DISTRIBUTED LOCK MANAGEMENT STATISTICS on node WELLS 12-APR :00:08.67 CUR AVE MIN MAX New ENQ Rate (Local) (Incoming) (Outgoing) Converted ENQ Rate (Local) (Incoming) (Outgoing) DEQ Rate (Local) (Incoming) (Outgoing) Blocking AST Rate (Local) (Incoming) (Outgoing) Dir Functn Rate (Incoming) (Outgoing) Deadlock Message Rate
26 Workload PLT Enabled From SAGAN DISTRIBUTED LOCK MANAGEMENT STATISTICS on node SAGAN 12-APR :00:53.32 CUR AVE MIN MAX New ENQ Rate (Local) (Incoming) (Outgoing) Converted ENQ Rate (Local) (Incoming) (Outgoing) DEQ Rate (Local) (Incoming) (Outgoing) Blocking AST Rate (Local) (Incoming) (Outgoing) Dir Functn Rate (Incoming) (Outgoing) Deadlock Message Rate
27 27 TPS, PLT Enabled
28 Where PLT May Help Most Mostly segregated workload by area by node Mostly RW or long RO transactions More cluster nodes to distribute among 28
29 Where PLT May Not Help As Much Lots of short RO transactions Root/TSNBLK access dominates Workload difficult/impossible to partition 29
30 Considerations Evaluate use of PE1 LOCKDIRWT LOCKRMWT Faster cluster interconnects Faster storage (quicker IO = less time locks are held) 30
31 Q & A A N S W E R S Q U E S T I O N S A N S W E R S With Thanks Kevin Jenkins Greg Jordan Christian Moser Paul Mead Jeff Jalbert Keith Hare norman.lastovica@oracle.com 31
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