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Informix Online 5 freezes several times a week

Informix Online 5 freezes several times a week

Informix Online 5 freezes several times a week


Several times Informix 5.10.UC1 freezes. When running tbstat -uk I see in the header "CHKPNT REQ". Nothing some to help (tbstat -c e.q). The only solution is to stop the database and start up Informix again.

Can somebody give me some tips? The database is running in a production environment on a virtual (VMWare) server.

The Netherlands

** Here some parameters **

# Root Dbspace Configuration

ROOTNAME        rootdbs         # Root dbspace name
ROOTPATH        /dev/rinformix0 # Path for device containing root dbspace
ROOTOFFSET      0               # Offset of root dbspace into device (Kbytes)
ROOTSIZE        2000000         # Size of root dbspace (Kbytes)

# Disk Mirroring Configuration

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

# Physical Log Configuration

PHYSDBS         rootdbs         # Name of dbspace that contains physical log
PHYSFILE        2000            # Physical log file size (Kbytes)

# Logical Log Configuration

LOGFILES        55              # Number of logical log files
LOGSIZE         1000            # Size of each logical log file (Kbytes)
# Shared Memory Parameters

RESIDENT        1               # Forced residency flag (Yes = 1, No = 0)
USERS           150             # Maximum number of concurrent user processes
TRANSACTIONS    150             # Maximum number of concurrent transactions
LOCKS           10000           # Maximum number of locks
BUFFERS         1000            # Maximum number of shared memory buffers
TBLSPACES       2300            # Maximum number of active tblspaces
CHUNKS          8               # Maximum number of chunks
DBSPACES        8               # Maximum number of dbspaces and blobspaces
PHYSBUFF        32              # Size of physical log buffers (Kbytes)
LOGBUFF         32              # Size of logical log buffers (Kbytes)
LOGSMAX         61              # Maximum number of logical log files
CLEANERS        1               # Number of page-cleaner processes
SHMBASE         0x0               # Shared memory base address
CKPTINTVL       300             # Checkpoint interval (in seconds)
LRUS            8               # Number of LRU queues
LRU_MAX_DIRTY   60              # LRU modified begin-cleaning limit (percent)
LRU_MIN_DIRTY   50              # LRU modified end-cleaning limit (percent)
LTXHWM          50              # Long TX high-water mark (percent)
LTXEHWM         60              # Long TX exclusive high-water mark (percent)

RE: Informix Online 5 freezes several times a week

Have a look here:


(CKPT REQ) Some process has requested a checkpoint, and the engine is trying to initiate the checkpoint. This flag is often seen if the database is hung waiting for a checkpoint.
and here:

Hope This Helps, PH.
FAQ219-2884: How Do I Get Great Answers To my Tek-Tips Questions?
FAQ181-2886: How can I maximize my chances of getting an answer?

RE: Informix Online 5 freezes several times a week


Thanks for your tips. Last month I tried a lot, but nothings works.

CLEANERS: from 1 to 6
LOCKS: from 10.000 to 80.000
BUFFERS: from 1000 to 5.000
LRU_MAX_DIRTY: from 60 to 40
LRU_MIN_DIRTY: from 50 to 30

Database is still freezing, sometimes 10 times a day. Do you haven additional hints or tips?


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