Analytics / requirement model

It is a puzzle that I put myself after a discussion to make choices between SQL and PL/SQL - is not urgent not important and not serious.

If I query dba_extents for a given table (e.g. sys.source$) measure information looks like this:

Select file_id, block_id, blocks

from dba_extents

where owner = 'SYS '.

and nom_segment = '$SOURCE. '

order of file_id, block_id

;

FILE_ID, BLOCK_IDBLOCKS

---------- ---------- ----------

115048
181688
181768
181928
182888
184408
1100728

...

177568128
177696128
177824128
178080128
189984128

...

1907521024

80 selected lines.

I have a piece of code that bed the exent list, joins a list of numbers to enumerate each block in each scope, sorts the blocks of file_id and block_id, applies to an ntile (12) for the result set, and then selects the first and the last block in each tile to produce an output which is essentially 12 rows (first_file_id first_block_id (, last_file_id, last_block_id)-which I can convert it to a set of coating lines for the table rowid.  (This is essentially what dbms_parallel_execute when you create pieces of rowid - except that it uses the PL/SQL to do).

My SQL does exactly the necessary work, but is significantly slower than the equivalent PL/SQL - we're talking only a few seconds on the line for very large objects, so the difference is not relevant for the purposes of actual production - largely, I think, because I have to increase the size of the initial result set between the number of extensions and the number of blocks and then narrow down again so that the PL/SQL can simply browse the definitions of making simple arithmetic.

I'm sure that there is a way of MODEL clause to avoid explosion, and I'd like to see if anyone has the time, but I keep thinking I'm close an analytical solution, but can't quite get there. So if anyone can find a solution that would be even better than a solution of model - failing that someone proves that it can be done effectively in simple analytical SQL.

UPDATE: I forgot to declare explicitly that point to the explosion of the block and ntile() was that it was a simple strategy to get the same number (+ /-1) block in all ranges of rowid.

Concerning

Jonathan Lewis

Post edited by: Jonathan Lewis

The solution:

[Update: Please see https://stewashton.wordpress.com/2015/07/01/splitting-a-table-into-rowid-ranges-of-equal-size/ for an update solution, a bit cleaner.] Thanks Chris227, I learned for the function WIDTH_BUCKET]!

with data as (
  select (select blocks / 12 from my_segments) blocks_per_chunk,
  object_id
  from my_objects
)
, extents as (
  select
  nvl(sum(blocks) over(
    order by file_id, block_id
    rows between unbounded preceding and 1 preceding
  ),0) cumul_start_blocks,
  sum(blocks) over(order by file_id, block_id) - 1 cumul_end_blocks,
  blocks, block_id, file_id,
  data.*
  from my_extents, data
)
, extents_with_chunks as (
  select
  trunc(cumul_start_blocks / blocks_per_chunk) first_chunk,
  trunc((cumul_end_blocks) / blocks_per_chunk) last_chunk,
  round(trunc(cumul_start_blocks / blocks_per_chunk)*blocks_per_chunk) first_chunk_blocks,
  round(trunc((cumul_end_blocks+1.0001) / blocks_per_chunk)*blocks_per_chunk)-1 last_chunk_blocks,
  e.* from extents e
)
, expanded_extents as (
  select first_chunk + level -1  chunk,
  cumul_start_blocks, file_id, block_id,
  case level when 1 then cumul_start_blocks
      else round((first_chunk + level -1)*blocks_per_chunk)
    end start_blocks,
    case first_chunk + level -1 when last_chunk then cumul_end_blocks
      else round((first_chunk + level)*blocks_per_chunk)-1
    end end_blocks
  from (
    select * from extents_with_chunks
    where first_chunk_blocks = cumul_start_blocks
      or last_chunk_blocks = cumul_end_blocks
      or first_chunk < last_chunk
  )
  connect by cumul_start_blocks = prior cumul_start_blocks
  and first_chunk + level -1 <= last_chunk
  and prior sys_guid() is not null
)
select chunk,
min(file_id) first_file_id,
max(file_id) last_file_id,
min(block_id + start_blocks - cumul_start_blocks)
  keep (dense_rank first order by cumul_start_blocks) first_block_id,
max(block_id + end_blocks - cumul_start_blocks)
  keep (dense_rank last order by cumul_start_blocks) last_block_id,
max(end_blocks) + 1 - min(start_blocks) blocks
from expanded_extents
group by chunk
order by chunk;

Tags: Database

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