Reference
The onstat field guide.
onstat reads the Informix shared-memory structures and reports the state of the engine without taking any locks. Pick a flag to see what it shows and how to read the output.
onstat -g subcommands
-g act-g afr-g all-g amx-g aqt-g arc-g ath-g buf-g cac-g cat-g cdc-g cdr-g cdrconfig-g cfg-g ckp-g cluster-g cmsm-g con-g cpu-g dbc-g ddr-g dic-g dis-g dll-g dmp-g dri-g dsc-g dsk-g dss-g dtc-g env-g ffr-g glo-g grp-g his-g imc-g ioa-g iob-g iof-g iog-g ioq-g iov-g ipl-g lap-g laq-g lmm-g lmx-g lsc-g mem-g mgm-g nbm-g nif-g nsc-g nsd-g nss-g nta-g ntd-g ntm-g ntt-g ntu-g opn-g osi-g pgp-g pos-g ppd-g ppf-g pqs-g prc-g proxy-g qst-g rah-g ras-g rbm-g rcv-g rea-g rep-g rqm-g rss-g rwm-g sch-g scn-g sds-g seg-g ses-g sle-g smb-g smx-g spi-g sql-g src-g ssc-g stk-g stm-g stq-g sts-g sym-g sync-g tgp-g tpf-g ufr-g vpcache-g wai-g wmx-g wst