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https://issues.apache.org/jira/browse/DERBY-5494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13291063#comment-13291063
]
Mamta A. Satoor commented on DERBY-5494:
----------------------------------------
For both identity column and sequences, I ran two kinds of tests, Here is what
I got for 10.9 release candidate vs 10.8.1.2. I have run 3 times each of these
4 tests. The tests were run with write caching disabled.
Identity test(default behavior. I haven't given any parameters for
preallocation number, number of threads, number of tables or number of inserts
per transaction)
java -Dderby.system.home=./systest/db1
org.apache.derbyTesting.perf.clients.Runner -driver
org.apache.derby.jdbc.EmbeddedDriver -init -load seq_gen -load_opts
debugging=0,identityTest=1 -gen b2b
-----------------------------------------------------------------------------------------------------------
10.9 |
10.8
-----------------------------------------------------------------------------------------------------------
- of transactions | Average Thruput | - of transactions | Average
Thruput
-----------------------------------------------------------------------------------------------------------
5015 | 83.58333333333333 | 3889 |
64.81666666666666
-----------------------------------------------------------------------------------------------------------
4697 | 78.28333333333333 | 4578 | 76.3
-----------------------------------------------------------------------------------------------------------
5150 | 85.83333333333333 | 5016 | 83.6
-----------------------------------------------------------------------------------------------------------
Sequence test(default behavior. I haven't given any parameters for
preallocation number, number of threads, number of tables or number of inserts
per transaction)
java -Dderby.system.home=./systest/db4
org.apache.derbyTesting.perf.clients.Runner -driver
org.apache.derby.jdbc.EmbeddedDriver -init -load seq_gen -load_opts
debugging=0,identityTest=0 -gen b2b
-----------------------------------------------------------------------------------------------------------
10.9 |
10.8
-----------------------------------------------------------------------------------------------------------
- of transactions | Average Thruput | - of transactions | Average
Thruput
-----------------------------------------------------------------------------------------------------------
5228 | 87.13333333333334 | 4330 |
72.16666666666667
-----------------------------------------------------------------------------------------------------------
5206 | 86.76666666666667 | 5026 |
83.76527057882369
-----------------------------------------------------------------------------------------------------------
5010 | 83.5 | 4489
| 74.81541974300428
-----------------------------------------------------------------------------------------------------------
Identity test(preallocation of 1, 1 thread, 1 table, inserts per transaction
100)
java -Dderby.system.home=./systest/db7 -Dderby.language.sequence.preallocator=1
org.apache.derbyTesting.perf.clients.Runner -driver
org.apache.derby.jdbc.EmbeddedDriver -init -load seq_gen -load_opts
debugging=0,numberOfGenerators=1,tablesPerGenerator=1,insertsPerTransaction=100,identityTest=1
-gen b2b -threads 1
-----------------------------------------------------------------------------------------------------------
10.9 |
10.8
-----------------------------------------------------------------------------------------------------------
- of transactions | Average Thruput | - of transactions | Average
Thruput
-----------------------------------------------------------------------------------------------------------
1537 | 25.616666666666667 | 1086 |
18.099698338361026
-----------------------------------------------------------------------------------------------------------
1628 | 27.133333333333333 | 1518 | 25.3
-----------------------------------------------------------------------------------------------------------
1514 | 25.230810252308103 | 1472 |
24.533333333333335
-----------------------------------------------------------------------------------------------------------
Sequence test(preallocation of 1, 1 thread, 1 table, inserts per transaction
100)
java -Dderby.system.home=./systest/db11
-Dderby.language.sequence.preallocator=1
org.apache.derbyTesting.perf.clients.Runner -driver
org.apache.derby.jdbc.EmbeddedDriver -init -load seq_gen -load_opts
debugging=0,numberOfGenerators=1,tablesPerGenerator=1,insertsPerTransaction=100,identityTest=0
-gen b2b -threads 1
-----------------------------------------------------------------------------------------------------------
10.9 |
10.8
-----------------------------------------------------------------------------------------------------------
- of transactions | Average Thruput | - of transactions | Average
Thruput
-----------------------------------------------------------------------------------------------------------
50 | 0.8333333333333334 | 3054 | 50.9
-----------------------------------------------------------------------------------------------------------
47 | 0.7833333333333333 | 3033 | 50.55
-----------------------------------------------------------------------------------------------------------
49 | 0.8166666666666667 | 3000 | 50.0
-----------------------------------------------------------------------------------------------------------
> Same value returned by successive calls to a sequence generator flanking an
> unorderly shutdown.
> -----------------------------------------------------------------------------------------------
>
> Key: DERBY-5494
> URL: https://issues.apache.org/jira/browse/DERBY-5494
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.6.1.0, 10.6.2.1, 10.7.1.1, 10.8.1.2, 10.8.2.2,
> 10.9.1.0
> Reporter: Rick Hillegas
> Assignee: Mike Matrigali
> Labels: derby_backport_reject_10_8, derby_triage10_9
> Fix For: 10.9.1.0, 10.10.0.0
>
> Attachments: derby-5494_3.diff, derby-5494_diff_1a.txt,
> derby-5494_diff_2.txt
>
>
> The following sequence of steps causes a sequence generator to return the
> same value on successive NEXT VALUE FOR calls.
> 1) Bring up ij and issue the following commands:
> connect 'jdbc:derby:db;create=true';
> create sequence s;
> values next value for s;
> 2) Control-c out of ij so that the engine comes down hard without an orderly
> shutdown.
> 3) Now bring up ij again and issue the following commands:
> connect 'jdbc:derby:db';
> values next value for s;
> Thanks to Knut for finding this one.
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