private memory

This memory is referred to as the agent private memory - It cannot be shared with any other agents.

If there are many idle agents and all of them retain their private memory, it is possible that the system runs out of memory.

The qualifying records (only the relevant columns) are copied to a private memory pool to be filtered by a stage-2 predicate.

Agent private memory is affected by the database configuration parameters shown in Table 5.

Within this segment, the db2sysc executables take only a small fraction, the rest is used for agent private memory (200MB ).

The memory used for private sorts is allocated from an agent's private memory.

In between the shared libraries, the segments in orange are the agent private memory.

The combination of quadrant 1 and 2 (minus kernel and other process memory) can be used for private memory.

You may have noticed that there is not a segment for agent private memory. You are correct.

The agent private memory is allocated in any free space between the shared libraries.

Gets the amount of private memory allocated for the associated process.

We have mentioned that private memory is allocated to a DB2 agent when the agent is "assigned" to perform work.

If the sort is a private sort, then this parameter affects agent private memory.

This is designed to improve performance, because the agent will have its private memory ready when it is called again.

However, it can be changed to a higher address so more room is left for agent private memory.

Agent private memory may be paged out if the agent has been idle for a long time.

When an agent becomes idle, it retains its agent private memory.

Each agent has its own private memory.

For LOAD, all index key sorting takes place simultaneously in the private memory space of one process: db2lrid in SMP, db2lfrm0 in serial.

But what does shared memory and private memory mean?

It will also allocate a private memory area called PGA, where it stores what is private to the process and to the session.

The sortheap is a memory pool that belongs to the agent private memory set.

On Solaris, the agent private memory shares the same 256MB segment with the db2sysc executables.

Stat_heap_sz is part of agent private memory.

A query heap is used to store each query in the agent's private memory.

We said earlier that segment #2 in Figure 6 is used for agent private memory.

In addition to shared memory, DB2 also allows custom configuration of agent private memory into 16-megabyte pages.

There is one agent private memory set per DB2 agent (or process).

This article teaches you the basics of DB2 memory usage and the concepts of shared memory and private memory.

The typical consumer of agent private memory is the sort heap memory that is used by the agent to sort rows during query execution.

The first segment starts at 0x00010000 and it is reserved for db2sysc executables and the agent private memory.

Setting the stack to 16MB in ulimit gives 240MB for Agent Private Memory.

Processes, on the other hand, always have their own private memory space.

Platform Instance Shared Memory Database Shared Memory Agent Private Memory

Private memory usage is not so interesting anymore

The section in orange (heap), from 0x023F8000 to 0x10000000, is used for the agent private memory. (~220MB)

A private memory area within the SPU called the local store (the size of this area on the PS3 is 256K)

db2mtrk can report private memory allocations, but weak in other areas

An agent private memory set for agent x;

4GB - agent private memory - DB2 trace - DB2 shared libraries - Stack