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Monitoring Memory Utilization

Use the following onstat -g arguments to monitor memory utilization. For overall memory information, omit table name, pool name, or session id from the commands that permit those optional parameters.

Argument
Description
ffr pool name | session id
Displays free fragments for a pool of shared memory or by session
dic table name
Displays one line of information for each table cached in the shared-memory dictionary

If you provide a specific table name as a parameter, this argument displays internal SQL information about that table.

dsc
Displays one line of information for each column of distribution statistics cached in the data distribution cache.
mem pool name | session id
Displays memory statistics for the pools that are associated with a session

If you omit pool_name | session id, this argument displays pool information for all sessions.

mgm
Displays memory grant manager resource information
nsc client id
Displays shared-memory status by client ID

If you omit client id, this argument displays all client status areas.

nsd
Displays network shared-memory data for poll threads
nss session id
Displays network shared-memory status by session id

If you omit session id, this argument displays all session status areas.

prc
Displays one line of information for each user-defined routine (SPL routine or external routine written in C or Java programming language) cached in the UDR cache
seg
Displays shared-memory-segment statistics

This argument shows the number and size of all attached segments.

ses session id
Displays memory usage for session id

If you omit session id, this argument displays memory usage for all sessions.

ssc
Displays one line of information for each query cached in the SQL statement cache
stm session id
Displays memory usage of each SQL statement for session id

If you omit session id, this argument displays memory usage for all sessions.

ufr pool name | session id
Displays allocated pool fragments by user or session
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