Accelerating OpenERP accounting: Precalculated period sums

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Accelerating OpenERP accounting:
Precalculated period sums

Borja López Soilán
...

Index
Current approach (sum of entries)
● Current approach explained.
● Performance analysis.
Proposal: “Precalculated...

Current approach: Sum of entries

Currently each time you read the
credit/debit/balance of one account OpenERP h...

Inside the current approach
_query_get() filters: builds the “WHERE” part
of the SQL query that selects all the account
mo...

Sample query done by __compute
SELECT l.account_id as id,
COALESCE(SUM(l.debit), 0) as debit,
COALESCE(SUM(l.credit), 0) a...

Sample query plan
QUERY PLAN

-------------------------------------------...

Performance Analysis
Current approach big O 1/2
“Selects all the account move lines”
The query complexity depends on l...

Current approach big O 2/2
O(__compute) = O(query) + O(aggregate)

O(__compute) = O(f(l)) + O(g(c))

What kind of functi...

Let's test this chart... 1/2
The official Spanish
chart of accounts, when
empty:
Has about 1600
accounts.
Has 5 leve...

Let's test this chart... 2/2
How many accounts
below each level?
Account code Number of
...

Ok, looks like the number of children c has a
lot of influence, and the number of moves l
has little or zero influence, g(...

Now it is clear that g(c) is linear!
(note: the nº of children grows exponentially)
O(g(c)) = O(c)

So, the influence was little, but linear too!
O(f(l)) = O(l)

Big O - Conclusion
O(__compute) = O(l) + O(c)

c has an unexpectedly big influence on the
results
=> Bad performance on co...

Proposal: Precalculated sums
OpenERP recalculates the debit/credit/balance
from move lines each time.
Most accounting prog...

It's really faster?
Precalculated sums per period means:
● O(p)query (get the debit/credit/balance of each
period fo...

Alternative 1: Accumulated values
using triggers (I)
Proposed by Ferdinand Gassauer.
How does it work?
● New ob...

Alternative 1: Accumulated values
using triggers (II)
How does it work?(cont.)
● The data is calculated accumul...

Alternative 1: Accumulated values
using triggers (III)
Good points Bad points
Tri...

Alternative 2: Period totals using the
ORM (I)
Proposed by Borja L.S. (@NeoPolus).
How does it work?
● ...

Alternative 2: Period totals using the
ORM (II)
How does it work?(cont.)
● Extends account.account.__c...

Alternative 2: Period totals using the
ORM (III)
Good points Bad points
Database ...

Current approach VS Period sums
Current approach Precalculated sums
Pros Pros
...

Precalculated sums – Drill down navigation
(Chricar prototype) 1/3

Precalculated sums – Drill down navigation (Chricar prototype) 2/3

Precalculated sums – Drill down navigation (Chricar prototype) 3/3

And one last remark...

...all this is applicable to the stock quantities
computation too!

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