Oracle vs. SQL Server

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The Lizard = Data

• National Human Genome Research Institute• ENCODE Project: ENCyclopedia Of DNA

Elements• Anolis carolinensis (Green anole lizard)• 35,642,840 (50 byte) contigs • 7,233 Scaffolds• 8,354,004 Repeating Sequences• (1,782,142,000 Individual DNA elements)

Data

Setup

Oracle Database 11g SQL Server 2005

Test #1 -Performance

• Inserts• Updates• Deletes• Selects

TEST_INSERT

• LOOP 100,000– INSERT Record– COMMIT

• END LOOP

TEST_UPDATE

• UPDATE• COMMIT

TEST_INSERT_WITH_TRANSACTION

• BEGIN TRAN– LOOP 1,000,000• INSERT Record

– END LOOP• COMMIT

TEST_DELETE

• DELETE FROM TABLE• COMMIT

TEST_SELECT_COUNT_START_REPEATS

• SELECT COUNT(*) FROM REPEATS

TEST_SELECT_COUNT_START_DNA

• SELECT COUNT(*) FROM DNA

TEST_SELECT_JOIN_AND_SUM

SELECTSUM(R.SCAFFOLD_END) INTO CCOUNT

FROMREPEATS R,SCAFFOLDS S

WHERER.SCAFFOLD_NAME = S.SCAFFOLD_NAMEAND S.SCAFFOLD_NAME like

'scaffold_1%';

Test #2 -Locking

• Row Multiversioning• NOLOCK or READUNCOMMITTED• READPAST• Writers vs Readers• SNAPSHOT_ISOLATION

TEST_SELECT_ACROSS_LOCK

BEGIN TRAN

UPDATE REPEATSSET SCAFFOLD_END = 0 WHERE ID = 80221

TEST_SELECT_ACROSS_LOCK

• ALTER DATABASE SvO• SET ALLOW_SNAPSHOT_ISOLATION ON

• ALTER DATABASE SvO• SET READ_COMMITTED_SNAPSHOT ON