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RES: # Parallel Database Queries (pdq)

Posted By: Celso Cabral Coimbra
Date: Thursday, 22 April 2010, at 8:01 a.m.

In Response To: # Parallel Database Queries (pdq) (FERRAZ ELIEL)

Eliel,

Meu ambiente é parecido com o seu, porem um pouco maior, meus parâmetros de estão configurados conforme abaixo. Eu não tenho muitas conexões, mas as conexões sem pdq também precisam de mais memória que um ambiente normal.
Provavelmente você não precisara alterar o parâmetro DS_NONPDQ_QUERY_MEM, pois irá alterar a memória para sessões abertas sem pdq. Alias, não sei se este parâmetro existe na versão 7.31.
Alterações nos parâmetros de pdq, devem vir acompanhadas de analise da virtual portion, pois esta bem ligada.
O parâmetro MAX_PDQPRIORITY setado em 100, é um pouco perigoso para concorrência em queries com pdq ligadas, pois se setar o pdq high ou 100, ira utilizar todos os recursos de memória, eu deixo em 25, pois eu posso paralelizar quatro processos com pdq high.
Os parâmetros DS_MAX_QUERIES e DS_MAX_SCANS dependem um pouco se você utiliza particionamento e das queries que você utiliza (se tem muitos joins, etc.)
Lembrando, se setar MAX_PDQPRIORITY em 25 e você rodar um parâmetro "set pdqpriority 50", no onstat -g MGM você verá a query entrara com prioridade 12, ou seja, 50% do Maximo de 25.

Onconfig
###################################################################
# Parallel Database Query (PDQ) Configuration Parameters
###################################################################
# MAX_PDQPRIORITY - The maximum amount of resources, as a
# percentage, that PDQ can allocate to any
# one decision support query
# DS_MAX_QUERIES - The maximum number of concurrent decision
# support queries
# DS_TOTAL_MEMORY - The maximum amount, in KB, of decision
# support query memory
# DS_MAX_SCANS - The maximum number of concurrent decision
# support scans
# DS_NONPDQ_QUERY_MEM - The amount of non-PDQ query memory, in KB.
# Acceptable values are 128 to 25% of
# DS_TOTAL_MEMORY.
# DATASKIP - Specifies whether to skip dbspaces when
# processing a query. Acceptable values are:
# - ALL Skip all unavailable fragments
# - ON <dbspace1> <dbspace2>... Skip listed
# dbspaces
# - OFF Do not skip dbspaces (default)
###################################################################

MAX_PDQPRIORITY 25
DS_MAX_QUERIES 200
DS_TOTAL_MEMORY 200000
DS_MAX_SCANS 1000
DS_NONPDQ_QUERY_MEM 2048

Onstat -g mgm
Memory Grant Manager (MGM)
--------------------------

MAX_PDQPRIORITY: 25
DS_MAX_QUERIES: 200
DS_MAX_SCANS: 1000
DS_NONPDQ_QUERY_MEM: 2048 KB
DS_TOTAL_MEMORY: 200000 KB
100

Celso Cabral Coimbra
Administrador de Banco de Dados
ClearTech Ltda
"Trust at the heart of Communications"
Tel. (11) 3576-4509

-----Mensagem original-----
De: iiug-por-bounces@iiug.org [mailto:iiug-por-bounces@iiug.org] Em nome de FERRAZ ELIEL
Enviada em: quarta-feira, 21 de abril de 2010 16:28
Para: iiug-por@iiug.org
Assunto: # Parallel Database Queries (pdq) [99]

Tenho um banco Informix que sua principal atividade é desenvolver a função de
OLTP porém inevitavélmente tenho alguns momentos que ele faz a atividade de
DSS tenho cerca de 500 conexões abertas com esse banco neste banco preciso de
muita performance e com o Informix não estou conseguindo obter o resultado
tenho a versão 7.31 (Já sei que preciso migrar é um projeto para Agosto/2010
porém tenho serios riscos de não segurar o Informix pela performance e perder
para o banco concorrente)

Neste servidor tenho os parametros de # Parallel Database Queries (pdq)
conforme abaixo configurado gostaria de saber se alguem pode opinar sobre
esses parametros ... Servidor tem 12 GB de RAM 4 Discos SAS 136 GB 2
processoreas 4 nucleos Intel

# Parallel Database Queries (pdq)
MAX_PDQPRIORITY 100 # Maximum allowed pdqpriority
DS_MAX_QUERIES # Maximum number of decision support queries
DS_TOTAL_MEMORY # Decision support memory (Kbytes)
DS_MAX_SCANS 1048576 # Maximum number of decision support scans
DATASKIP off # List of dbspaces to skip

*******************************************************************************
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Messages In This Thread

  • # Parallel Database Queries (pdq)
    FERRAZ ELIEL -- Wednesday, 21 April 2010, at 3:27 p.m.
    • RES: # Parallel Database Queries (pdq)
      Celso Cabral Coimbra -- Thursday, 22 April 2010, at 8:01 a.m.

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