# Logical Log Configuration
LOGFILES 3 # Number of logical log files（最少3个）
LOGSIZE 40 # Logical log size (Kbytes)
在设初始值时放在rootdbs，并且空间可以很小，等到数据库服务器初始化后再进行在其它Dbspace上建立物理日志和逻辑日志
# Diagnostics
MSGPATH /usr/informix/online.log # System message log file path
CONSOLE /dev/console # System console message path
ALARMPROGRAM /usr/informix/log_full.sh # Alarm program path
# System Archive Tape Device
TAPEDEV /dev/tapedev # Tape device path
如果是调试环境可将备份设到：/dev/null
TAPEBLK 16 # Tape block size (Kbytes)
如果是要备份到磁带，最好设置得大一些（1024 or 2048）,可提高备份速度。
TAPESIZE 10240 # Maximum amount of data to put on tape (Kbytes)
# Log Archive Tape Device
LTAPEDEV /dev/tapedev # Log tape device path
LTAPEBLK 16 # Log tape block size (Kbytes)
LTAPESIZE 10240 # Max amount of data to put on log tape (Kbytes)
# Optical
STAGEBLOB # INFORMIX-OnLine/Optical staging area
# System Configuration
SERVERNUM 0 # Unique id corresponding to a OnLine instance
如果只用一个服务器，则设为0，如果有多个服务器，其值必须是1到255之间。
DBSERVERNAME # Name of default database server
DBSERVERALIASES # List of alternate dbservernames
NETTYPE # Configure poll thread(s) for nettype
DEADLOCK_TIMEOUT 60 # Max time to wait of lock in distributed env.
RESIDENT 0 # Forced residency flag (Yes = 1, No = 0)
MULTIPROCESSOR 0 # 0 for single-processor, 1 for multi-processor
CPU VPs INFORMIX使用VP的个数，一般为1
NUMCPUVPS 0 # Number of user (cpu) vps
AIO VPs 使用操作系统的VP个数，取缺省值
SINGLE_CPU_VP 0 # If non-zero, limit number of cpu vps to one
如果CPU个数在4个以下，可设为Y--1
如果CPU个数在4个以下，则多CPU绑定VP配置应设为N--0
AFF-SPROCS NUM PROCS TO AFFINITY 绑定在CPU上的VP个数
AFF-NPROCS PROC NUM TO START WITH 从第几个SPU开始绑定
NOAGE 1 # Process aging
AFF_SPROC 2-3 取缺省值 # Affinity start processor
AFF_NPROCS 0 # Affinity number of processors
# Shared Memory Parameters
LOCKS 2000 # Maximum number of locks
对于比较大的应用、内存，锁的个数可设得大一些。
经验值：100000
每个锁：44字节
BUFFERS 200 # Maximum number of shared buffers
逻辑日志的大小，经验值为物理内存的25%。
数据量大的应用应适当增加（必须与SHMVIRSIZE同时增加），
NUMAIOVPS # Number of IO vps
PHYSBUFF 32 # Physical log buffer size (Kbytes)
LOGBUFF 32 # Logical log buffer size (Kbytes)
LOGSMAX 6 # Maximum number of logical log files
CLEANERS 1 # Number of buffer cleaner processes
SHMBASE 0 # Shared memory base address
SHMVIRTSIZE 8000 # initial virtual shared memory segment size
数据量大的应用应适当增加（必须与BUFFERS同时增加），
SHMADD 8192 # Size of new shared memory segments (Kbytes)
SHMTOTAL 0 # Total shared memory (Kbytes). 0=>;unlimited
CKPTINTVL 300 # Check point interval (in sec)
LRUS 8 # Number of LRU queues
LRU_MAX_DIRTY 60 # LRU percent dirty begin cleaning limit
LRU_MIN_DIRTY 50 # LRU percent dirty end cleaning limit
LTXHWM 50 # Long transaction high water mark percentage
LTXEHWM 60 # Long transaction high water mark (exclusive)
TXTIMEOUT 300 # Transaction timeout (in sec)
STACKSIZE 32 # Stack size (Kbytes)
# 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 /usr/informix/etc/dr.lostfound # DR lost+found file path
# CDR Variables
CDR_LOGBUFFERS 2048 # size of log reading buffer pool (Kbytes)
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)
# Read Ahead Variables
RA_PAGES # 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 # 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 /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
如果是没有大型的并行数据库的操作，应设为0
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
取缺省值
DATASKIP OFF # 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 2 # To hint the optimizer
优化因子：0如果有索引则通过索引优化
优化因子：2系统优化SQL语句
ONDBSPACEDOWN 2 # Dbspace down option: 0 = CONTINUE, 1 = ABORT, 2 = WAIT
LBU_PRESERVE 0 # Preserve last log for log backup
经验值：1
目的：逻辑日志全部满后又无备份机制，数据库将会出错并导致系统死机。
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
配置完毕后，启动数据库SERVER，进入ONLINE状态则成功。
INFORMIXDIR/bin