常见dml、ddl语句使用nologging选项所生成的redo和undo大小比较

Redo

Undo

Redo

Undo

Insert into XXX select * from YYY

N

N

N

19076324

627240

18938620

612980

Alter table XXX nologging;

Insert into XXX select * from YYY;

N

Y

N

19085860

631584

18935548

612912

Insert /*+ append */ into XXX select * from YYY

Y

N

N

26628

4048(only metadata)

19145656

4048

Alter table XXX nologging;

Insert /*+ append */ into XXX select * from YYY

Y

Y

N

26868

4048(only metadata)

26836

4048

Create table XXX as select * from YYY

Y

N

N

77624

18500

19162220

15468

Create table XXX nologging as select * from YYY

Y

Y

N

52160

11176

52408

11248

Alter table XXX move nologging;

N

Y

N

36288

6208

36576

6208

Alter table XXX move;

N

N

N

39788

7288

19154024

5972

Create index XXX

N

N

N

21280

1864

3093616

1888

Create index XXX nologging

N

Y

N

22264

2208

22620

2232

update XXX set

N

N

N

122903212

47987880

122403692

47786680

Update /*+ parallel(5) */ XXX set

N

N

Y(Queries)

121629928

46706296

120818336

46466056

Alter table XXX nologging;

update XXX set

N

Y

N

123155288

48006404

110396512

41617700

Alter table XXX nologging;

update /*+ parallel(5) */ XXX set

N

Y

Y(Queries)

119748064

46152324

120205036

46261536

Alter session enable parallel dml

Update /*+ parallel(5) */ XXX set

N

N

Y(DML)

59846488

24680220

59740516

24611672

Alter table XXX nologging;

Alter session enable parallel dml

Update /*+ parallel(5) */ XXX set

N

Y

Y(DML)

59831756

24673396

59717116

24602628

delete XXX;

N

N

N

60684720

37650208

61770472

38254648

delete /*+parallel(5) */ XXX;

N

N

Y(Queries)

60685416

37650436

61988568

38461832

Alter table XXX nologging;

delete XXX;

N

Y

N

60684956

37650216

61989984

38460424

Alter table XXX nologging;

delete /*+parallel(5) */ XXX;

N

Y

Y(Queries)

60685092

37650224

61986156

38459172

Alter session enable parallel dml

delete /*+parallel(5) */ aabbn;

N

N

Y(DML)

65072896

40990412

61979216

38457372

Alter table XXX nologging;

Alter session enable parallel dml

delete /*+parallel(5) */ aabbn;

N

Y

Y(DML)

65073828

40998048

62022668

38500548