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AdministeringIn addition to administering the database server, you can tune performance, replicate data, and archive data.
System administrationThese topics contain concepts, procedures, and reference information for database and database server administrators to use for managing and tuning HCL OneDB™ database servers.
Administrator's ReferenceThe HCL OneDB™ Administrator's Reference includes comprehensive descriptions of HCL OneDB™ configuration parameters, the system-monitoring interface (SMI) tables in the sysmaster database, the syntax of database server utilities such as onmode and onstat, logical-log records, disk structures, event alarms, and unnumbered error messages.
Administrative Utilities
The onstat utilityThe onstat utility reads shared-memory structures and provides statistics about the database server at the time that the command runs.
onstat -g monitoring optionsThe options that you can use with onstat -g command are used for support and debugging only. You can include only one of these options in the onstat -g command.
onstat -g rwm command: Print read and write mutexes Use the onstat -g rwm command to display information about read, write, and waiting mutex threads, and to list the addresses of the tickets that these threads have acquired.

onstat -g rwm command: Print read and write mutexes

Use the onstat -g rwm command to display information about read, write, and waiting mutex threads, and to list the addresses of the tickets that these threads have acquired.

Figure 1: Syntax:

Example output

Figure 2: onstat -g rwm command output

MUTEX   NAME     write/read/wait    tcb list
<address> <name>     first mutex
       Writer     ticket = <ticket address>   tcb=<thread address> <thread name>
       Readers    ticket = <ticket address>   tcb=<thread address> <thread name>
       Waiters    ticket = <ticket address>   tcb=<thread address> <thread name>
<address> <name>        second mutex
       Writer     ticket = <ticket address>   tcb=<thread address> <thread name>
       Readers     ticket = <ticket address>  tcb=<thread address> <thread name>
       Waiters     ticket = <ticket address>  tcb=<thread address> <thread name>
....
....
....
<address> <name>       last mutex
       Writer     ticket = <ticket address>   tcb=<thread address> <thread name>
       Readers    ticket = <ticket address>   tcb=<thread address> <thread name>
       Waiters    ticket = <ticket address>   tcb=<thread address> <thread name>

Output description

tcb: List of thread addresses
Writer: List of write threads
Readers: List of read threads
Waiters: List of waiting threads
ticket: Address of ticket acquired by the thread

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