Break a matrix into pieces

Hello.

I was wondering, what would be the best way to break an array of large column into pieces of a specific size?

Tags: NI Software

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True?
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I'm trying to derive some of generic logic that would be cut into pieces of defined size a large table. The goal is to perform the update into pieces and avoid questions too small restoration. The full table on the update scan is inevitable, given that the update target each row of the table.

The BIGTABLE has 63 million lines. The purpose of the bellow SQL to give ID all 2 million rows. So I use the rownum 'auto line numering field' and run a test to see I could. I expected the piece of fist to have 2 million rows, but in fact, it is not the case:

Here is the +(NOTE I had many problems with quotes, so some ROWID appears without their enclosing quotes or they disappear from current output here) code +:

select rn, mod, frow, rownum from (
    select rowid rn ,  rownum frow, mod(rownum, 2000000) mod  
  from bigtable order by rn) where mod = 0
/

SQL> /

RN                        MOD       FROW     ROWNUM
------------------ ---------- ---------- ----------
AAATCjAA0AAAKAVAAd          0    4000000          1
AAATCjAA0AAAPUEAAv          0   10000000          2
AAATCjAA0AAAbULAAx          0    6000000          3
AAATCjAA0AAAsIeAAC          0   14000000          4
AAATCjAA0AAAzhSAAp          0    8000000          5
AAATCjAA0AABOtGAAa          0   26000000          6
AAATCjAA0AABe24AAE          0   16000000          7
AAATCjAA0AABjVgAAQ          0   30000000          8
AAATCjAA0AABn4LAA3          0   32000000          9
AAATCjAA0AAB3pdAAh          0   20000000         10
AAATCjAA0AAB5dmAAT          0   22000000         11
AAATCjAA0AACrFuAAW          0   36000000         12
AAATCjAA6AAAXpOAAq          0    2000000         13
AAATCjAA6AAA8CZAAO          0   18000000         14
AAATCjAA6AABLAYAAj          0   12000000         15
AAATCjAA6AABlwbAAg          0   52000000         16
AAATCjAA6AACBEoAAM          0   38000000         17
AAATCjAA6AACCYGAA1          0   24000000         18
AAATCjAA6AACKfBABI          0   28000000         19
AAATCjAA6AACe0cAAS          0   34000000         20
AAATCjAA6AAFmytAAf          0   62000000         21
AAATCjAA6AAFp+bAA6          0   60000000         22
AAATCjAA6AAF6RAAAQ          0   44000000         23
AAATCjAA6AAHJjDAAV          0   40000000         24
AAATCjAA6AAIR+jAAL          0   42000000         25
AAATCjAA6AAKomNAAE          0   48000000         26
AAATCjAA6AALdcMAA3          0   46000000         27
AAATCjAA9AAACuuAAl          0   50000000         28
AAATCjAA9AABgD6AAD          0   54000000         29
AAATCjAA9AADiA2AAC          0   56000000         30
AAATCjAA9AAEQMPAAT          0   58000000         31

31 rows selected.

SQL> select count(*) from BIGTABLE where rowid < AAATCjAA0AAAKAVAAd ;

  COUNT(*)
----------
    518712             <-- expected around 2 000 000

SQL> select count(*) from BIGTABLE where rowid < AAATCjAA0AAAPUEAAv ;

  COUNT(*)
----------
   1218270     <-- expected around 4 000 000

SQL> select count(*) from BIGTABLE where rowid < AAATCjAA0AAAbULAAx ;

  COUNT(*)
----------
   2685289    <-- expected around 6 000 000

Amzingly, this code works perfectly for small tables, but fails for large tables. Does anyone has an explanation and possibly a solution to this?

Here's the complete SQL code that is suppposed to generate all the predicates, I need to add update statements in order to cut into pieces:

select line  from (
   with v as (select rn, mod, rownum frank from (
       select rowid rn ,  mod(rownum, 2000000) mod
           from BIGTABLE order by rn ) where mod = 0),
      v1 as (
              select rn , frank, lag(rn) over (order by frank) lag_rn  from v ),
      v0 as (
              select count(*) cpt from v)
    select 1, case
                when frank = 1 then ' and rowid  <  ''' ||  rn  || ''''
                when frank = cpt then ' and rowid >= ''' || lag_rn ||''' and rowid < ''' ||rn || ''''
                else ' and rowid >= ''' || lag_rn ||''' and rowid <'''||rn||''''
             end line
from v1, v0
union
select 2, case
           when frank =  cpt then   ' and rowid >= ''' || rn  || ''''
          end line
    from v1, v0 order by 1)
/

 and rowid  <  AAATCjAA0AAAKAVAAd
 and rowid >= 'AAATCjAA0AAAKAVAAd' and rowid < 'AAATCjAA0AAAPUEAAv''
 and rowid >= 'AAATCjAA0AAAPUEAAv' and rowid < 'AAATCjAA0AAAbULAAx''
 and rowid >= 'AAATCjAA0AAAbULAAx' and rowid < 'AAATCjAA0AAAsIeAAC''
 and rowid >= 'AAATCjAA0AAAsIeAAC' and rowid < 'AAATCjAA0AAAzhSAAp''
 and rowid >= 'AAATCjAA0AAAzhSAAp' and rowid < 'AAATCjAA0AABOtGAAa''
 and rowid >= 'AAATCjAA0AAB3pdAAh' and rowid < 'AAATCjAA0AAB5dmAAT''
 and rowid >= 'AAATCjAA0AAB5dmAAT' and rowid < 'AAATCjAA0AACrFuAAW''
 and rowid >= 'AAATCjAA0AABOtGAAa' and rowid < 'AAATCjAA0AABe24AAE''
 and rowid >= 'AAATCjAA0AABe24AAE' and rowid < 'AAATCjAA0AABjVgAAQ''
 and rowid >= 'AAATCjAA0AABjVgAAQ' and rowid < 'AAATCjAA0AABn4LAA3''
 and rowid >= 'AAATCjAA0AABn4LAA3' and rowid < 'AAATCjAA0AAB3pdAAh''
 and rowid >= 'AAATCjAA0AACrFuAAW' and rowid < 'AAATCjAA6AAAXpOAAq''
 and rowid >= 'AAATCjAA6AAA8CZAAO' and rowid < 'AAATCjAA6AABLAYAAj''
 and rowid >= 'AAATCjAA6AAAXpOAAq' and rowid < 'AAATCjAA6AAA8CZAAO''
 and rowid >= 'AAATCjAA6AABLAYAAj' and rowid < 'AAATCjAA6AABlwbAAg''
 and rowid >= 'AAATCjAA6AABlwbAAg' and rowid < 'AAATCjAA6AACBEoAAM''
 and rowid >= 'AAATCjAA6AACBEoAAM' and rowid < 'AAATCjAA6AACCYGAA1''
 and rowid >= 'AAATCjAA6AACCYGAA1' and rowid < 'AAATCjAA6AACKfBABI''
 and rowid >= 'AAATCjAA6AACKfBABI' and rowid < 'AAATCjAA6AACe0cAAS''
 and rowid >= 'AAATCjAA6AACe0cAAS' and rowid < 'AAATCjAA6AAFmytAAf''
 and rowid >= 'AAATCjAA6AAF6RAAAQ' and rowid < 'AAATCjAA6AAHJjDAAV''
 and rowid >= 'AAATCjAA6AAFmytAAf' and rowid < 'AAATCjAA6AAFp+bAA6''
 and rowid >= 'AAATCjAA6AAFp+bAA6' and rowid < 'AAATCjAA6AAF6RAAAQ''
 and rowid >= 'AAATCjAA6AAHJjDAAV' and rowid < 'AAATCjAA6AAIR+jAAL''
 and rowid >= 'AAATCjAA6AAIR+jAAL' and rowid < 'AAATCjAA6AAKomNAAE''
 and rowid >= 'AAATCjAA6AAKomNAAE' and rowid < 'AAATCjAA6AALdcMAA3''
 and rowid >= 'AAATCjAA6AALdcMAA3' and rowid < 'AAATCjAA9AAACuuAAl''
 and rowid >= 'AAATCjAA9AAACuuAAl' and rowid < 'AAATCjAA9AABgD6AAD''
 and rowid >= 'AAATCjAA9AABgD6AAD' and rowid < 'AAATCjAA9AADiA2AAC''
 and rowid >= 'AAATCjAA9AADiA2AAC' and rowid < 'AAATCjAA9AAEQMPAAT''
 and rowid >= 'AAATCjAA9AAEQMPAAT''

33 rows selected.

SQL> select count(*) from BIGTABLE where  1=1 and rowid  <  AAATCjAA0AAAKAVAAd ;

  COUNT(*)
----------
    518712

SQL> select count(*) from BIGTABLE where  1=1 and rowid  >= 'AAATCjAA9AAEQMPAAT'' ;

  COUNT(*)
----------
   1846369

Nice but not accurate...

The problem is that your query implies that ROWID, and ROWNUM are classified in the same way. For small tables it is very often the case, but not for the larger tables. Oracle does not guarantee return records in the order the rowid. However usually it works this way.

You could test ensuring that get you the rownum after you ordered. And see if it works then.

select rn, mod, frow, rownum
from (select rn, rownum frow, mod(rownum, 2000000) mod
        from  (select rowid rn from bigtable order by rn)
        order by rn
        )
where mod = 0
/

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Break a matrix into pieces

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