关于Informix数据库CheckPoint的问题。欢迎大家指教

我现在的数据库服务器，在每天早上数据处理的时候。每次做checkpoint的时间都太长了，有时候甚至达到300s的长度。请大家能给点建议。
服务器为一HP小型机，4CPU，8G内存。OS为Linux系统。数据库为Informix10下面贴出我的onconfig内容
#**************************************************************************
#
#  Licensed Material - Property Of IBM
#
#  "Restricted Materials of IBM"
#
#  IBM Informix Dynamic Server
#  (c) Copyright IBM Corporation 1996, 2006 All rights reserved.
#
#  Title:       onconfig.std
#  Description: IBM Informix Dynamic Server Configuration Parameters
#
#**************************************************************************

# Root Dbspace Configuration

ROOTNAME        rootdbs         # Root dbspace name
ROOTPATH        /home/informix/db/rootdbs # Path for device containing root dbspace
ROOTOFFSET      0               # Offset of root dbspace into device (Kbytes)
ROOTSIZE        1500000         # Size of root dbspace (Kbytes)

# Disk Mirroring Configuration Parameters

MIRROR          0               # Mirroring flag (Yes = 1, No = 0)
MIRRORPATH                      # Path for device containing mirrored root
MIRROROFFSET    0               # Offset into mirrored device (Kbytes)

# Physical Log Configuration

PHYSDBS         rootdbs         # Location (dbspace) of physical log
PHYSFILE        300000          # Physical log file size (Kbytes)

# Logical Log Configuration

LOGFILES        199             # Number of logical log files
LOGSIZE         2000            # Logical log size (Kbytes)

# Tablespace Tablespace Configuration in Root Dbspace

TBLTBLFIRST     0               # First extent size (Kbytes) (0 = default)
TBLTBLNEXT      0               # Next extent size (Kbytes) (0 = default)

# Security
# DBCREATE_PERMISSION:
# By default any user can create a database. Uncomment DBCREATE_PERMISSON to
# limit database creation to a specific user. Add a new DBCREATE_PERMISSION
# line for each permitted user.

#DBCREATE_PERMISSION    informix
# DB_LIBRARY_PATH:
# When loading a (C or C++) shared object (for a UDR or UDT), IDS checks that
# the user-specified path starts with one of the directory prefixes listed in
# the comma-separated list of prefixes in DB_LIBRARY_PATH. The string
# "$INFORMIXDIR/extend" must be included in DB_LIBRARY_PATH in order for
# extensibility and IBM supplied blades to work correctly.

# DB_LIBRARY_PATH $INFORMIXDIR/extend

# IFX_EXTEND_ROLE:
# 0 (or off) => Disable use of EXTEND role to control who can register
#               external routines.
# 1 (or on)  => Enable use of EXTEND role to control who can register
#               external routines. This is the default behaviour.
#
IFX_EXTEND_ROLE 1               # To control the usage of EXTEND role.

# Diagnostics

MSGPATH         /home/informix/online.log # System message log file path
CONSOLE         /dev/console    # System console message path

# To automatically backup logical logs, edit alarmprogram.sh and set
# BACKUPLOGS=Y
ALARMPROGRAM    /home/informix/etc/alarmprogram.sh # Alarm program path
ALRM_ALL_EVENTS 0               # Triggers ALARMPROGRAM for any event occur
TBLSPACE_STATS  1               # Maintain tblspace statistics

# System Archive Tape Device

TAPEDEV         /dev/null       # Tape device path
TAPEBLK         32              # Tape block size (Kbytes)
TAPESIZE        10240           # Maximum amount of data to put on tape (Kbytes)

# Log Archive Tape Device

LTAPEDEV        /dev/null       # Log tape device path
LTAPEBLK        32              # Log tape block size (Kbytes)
LTAPESIZE       10240           # Max amount of data to put on log tape (Kbytes)

# Optical

STAGEBLOB                       # Informix Dynamic Server staging area

# System Configuration
SERVERNUM       0               # Unique id corresponding to a OnLine instance
DBSERVERNAME    lssjsvr         # Name of default database server
DBSERVERALIASES                 # List of alternate dbservernames
NETTYPE         soctcp,1,200,CPU                        # Configure poll thread(s) for nettype
DEADLOCK_TIMEOUT        60      # Max time to wait of lock in distributed env.
RESIDENT        1               # Forced residency flag (Yes = 1, No = 0)

MULTIPROCESSOR  1               # 0 for single-processor, 1 for multi-processor
NUMCPUVPS       3               # Number of user (cpu) vps
SINGLE_CPU_VP   0               # If non-zero, limit number of cpu vps to one

NOAGE           0               # Process aging
AFF_SPROC       0               # Affinity start processor
AFF_NPROCS      3               # Affinity number of processors

# Shared Memory Parameters

LOCKS           1000000         # Maximum number of locks
NUMAIOVPS       4               # Number of IO vps
PHYSBUFF        384             # Physical log buffer size (Kbytes)
LOGBUFF         128             # Logical log buffer size (Kbytes)
CLEANERS        7               # Number of buffer cleaner processes
SHMBASE         0x200000000     # Shared memory base address
SHMVIRTSIZE     2048000         # initial virtual shared memory segment size
SHMADD          512000          # Size of new shared memory segments (Kbytes)
EXTSHMADD       100000          # Size of new extension shared memory segments (Kbytes)
SHMTOTAL        0               # Total shared memory (Kbytes). 0=>unlimited
SHMVIRT_ALLOCSEG 0              # Values between 0 and .99 are %, values > 1 are
                                # KB - when this much virtual memory is used we
                                # try to get a new segment. 0 means "off". 2nd
                                # parameter is alarm level
CKPTINTVL       300             # Check point interval (in sec)
TXTIMEOUT       300             # Transaction timeout (in sec)
STACKSIZE       256     # Stack size (Kbytes)

# Dynamic Logging
# DYNAMIC_LOGS:
#    2 : server automatically add a new logical log when necessary. (ON)
#    1 : notify DBA to add new logical logs when necessary. (ON)
#    0 : cannot add logical log on the fly. (OFF)
#
# When dynamic logging is on, we can have higher values for LTXHWM/LTXEHWM,
# because the server can add new logical logs during long transaction rollback.
# However, to limit the number of new logical logs being added, LTXHWM/LTXEHWM
# can be set to smaller values.
#
# If dynamic logging is off, LTXHWM/LTXEHWM need to be set to smaller values
# to avoid long transaction rollback hanging the server due to lack of logical
# log space, i.e. 50/60 or lower.
#
# In case of system configured with CDR, the difference between LTXHWM and
# LTXEHWM should be atleast 30% so that we could minimize log overrun issue.

DYNAMIC_LOGS    2
LTXHWM          70
LTXEHWM         80

# System Page Size
# BUFFSIZE - OnLine no longer supports this configuration parameter.
#            To determine the page size used by OnLine on your platform
#            see the last line of output from the command, 'onstat -b'.


# Recovery Variables
# OFF_RECVRY_THREADS:
# Number of parallel worker threads during fast recovery or an offline restore.
# ON_RECVRY_THREADS:
# Number of parallel worker threads during an online restore.

OFF_RECVRY_THREADS      10      # Default number of offline worker threads
ON_RECVRY_THREADS       1       # Default number of online worker threads

# Data Replication Variables
# DRAUTO: 0 manual, 1 retain type, 2 reverse type
DRAUTO          0               # DR automatic switchover
DRINTERVAL      30              # DR max time between DR buffer flushes (in sec)
DRTIMEOUT       30              # DR network timeout (in sec)
DRLOSTFOUND     /home/informix/etc/dr.lostfound # DR lost+found file path
DRIDXAUTO       0               # DR automatic index repair. 0=off, 1=on

# CDR Variables
CDR_EVALTHREADS 1,2     # evaluator threads (per-cpu-vp,additional)
CDR_DSLOCKWAIT  5       # DS lockwait timeout (seconds)
CDR_QUEUEMEM    4096    # Maximum amount of memory for any CDR queue (Kbytes)
CDR_NIFCOMPRESS 0       # Link level compression (-1 never, 0 none, 9 max)
CDR_SERIAL              0       # Serial Column Sequence
CDR_DBSPACE                     # dbspace for syscdr database
CDR_QHDR_DBSPACE    # CDR queue dbspace (default same as catalog)
CDR_QDATA_SBSPACE   # List of CDR queue smart blob spaces

# CDR_MAX_DYNAMIC_LOGS
# -1 => unlimited
#  0 => disable dynamic log addition
# >0 => limit the no. of dynamic log additions with the specified value.
# Max dynamic log requests that CDR can make within one server session.

CDR_MAX_DYNAMIC_LOGS    0  # Dynamic log addition disabled by default

# Backup/Restore variables
BAR_ACT_LOG   /home/informix/bar_act.log  # ON-Bar Log file - not in /tmp please
BAR_DEBUG_LOG /home/informix/bar_dbug.log # ON-Bar Debug Log - not in /tmp please
BAR_MAX_BACKUP  0
BAR_RETRY       1
BAR_NB_XPORT_COUNT 20
BAR_XFER_BUF_SIZE 31
RESTARTABLE_RESTORE     ON
BAR_PROGRESS_FREQ       0

# Informix Storage Manager variables
ISM_DATA_POOL   ISMData
ISM_LOG_POOL    ISMLogs

# Read Ahead Variables
RA_PAGES        10              # Number of pages to attempt to read ahead
RA_THRESHOLD                    # Number of pages left before next group

# DBSPACETEMP:
# OnLine equivalent of DBTEMP for SE. This is the list of dbspaces
# that the OnLine SQL Engine will use to create temp tables etc.
# If specified it must be a colon separated list of dbspaces that exist
# when the OnLine system is brought online.  If not specified, or if
# all dbspaces specified are invalid, various ad hoc queries will create
# temporary files in /tmp instead.

DBSPACETEMP     tempdbs         # Default temp dbspaces

# DUMP*:
# The following parameters control the type of diagnostics information which
# is preserved when an unanticipated error condition (assertion failure) occurs
# during OnLine operations.
# For DUMPSHMEM, DUMPGCORE and DUMPCORE 1 means Yes, 0 means No.

DUMPDIR         /home/informix/tmp      # Preserve diagnostics in this directory
DUMPSHMEM       1               # Dump a copy of shared memory
DUMPGCORE       0               # Dump a core image using 'gcore'
DUMPCORE        0               # Dump a core image (Warning:this aborts OnLine)
DUMPCNT         1               # Number of shared memory or gcore dumps for
                                # a single user's session

FILLFACTOR      90              # Fill factor for building indexes

# method for OnLine to use when determining current time
USEOSTIME       0       # 0: use internal time(fast), 1: get time from OS(slow)

# 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
DS_NONPDQ_QUERY_MEM 128         # Non PDQ query memory (Kbytes)
DATASKIP               # List of dbspaces to skip

# OPTCOMPIND
# 0 => Nested loop joins will be preferred (where
#      possible) over sortmerge joins and hash joins.
# 1 => If the transaction isolation mode is not
#      "repeatable read", optimizer behaves as in (2)
#      below.  Otherwise it behaves as in (0) above.
# 2 => Use costs regardless of the transaction isolation
#      mode.  Nested loop joins are not necessarily
#      preferred.  Optimizer bases its decision purely
#      on costs.
OPTCOMPIND      1      # To hint the optimizer

DIRECTIVES      1    # Optimizer DIRECTIVES ON (1/Default) or OFF (0)

ONDBSPACEDOWN   2      # Dbspace down option: 0 = CONTINUE, 1 = ABORT, 2 = WAIT
OPCACHEMAX      0      # Maximum optical cache size (Kbytes)

# HETERO_COMMIT (Gateway participation in distributed transactions)
# 1 => Heterogeneous Commit is enabled
# 0 (or any other value) => Heterogeneous Commit is disabled
HETERO_COMMIT   0

SBSPACENAME            # Default smartblob space name - this is where blobs
                       # go if no sbspace is specified when the smartblob is
                       # created. It is also used by some datablades as
                       # the location to put their smartblobs.
SYSSBSPACENAME         # Default smartblob space for use by the Informix
                       # Server. This is used primarily for Informix Server
                       # system statistics collection.

BLOCKTIMEOUT    3600   # Default timeout for system block
SYSALARMPROGRAM    /home/informix/etc/evidence.sh    # System Alarm program path
# Optimization goal: -1 = ALL_ROWS(Default), 0 = FIRST_ROWS
OPT_GOAL        -1

ALLOW_NEWLINE   0       # embedded newlines(Yes = 1, No = 0 or anything but 1)


#Create Index Online Shared Memory usage limitation
ONLIDX_MAXMEM           5120            # Per pool per index (Kbytes)

#Timeout for client connection request
LISTEN_TIMEOUT          10              # Timeout (in Seconds)

#Following are the deprecated configuration parameters, instead of these
#use BUFFERPOOL configuration parameter
#BUFFERS, LRUS, LRU_MIN_DIRTY, LRU_MAX_DIRTY

IFX_FOLDVIEW    0       # fold multiple tables or union all view with ansi joins
# The following parameters are related to the buffer pool
BUFFERPOOL      default,buffers=400000,lrus=8,lru_min_dirty=50.000000,lru_max_dirty=60.000000
BUFFERPOOL      size=2K,buffers=400000,lrus=8,lru_min_dirty=50.000000,lru_max_dirty=60.000000