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How to check memory target in Oracle Database?
If your database does not use automatic memory management, consult the Oracle Database Administrator’s Guide to find out how to configure manual memory parameters (for example, SGA_TARGET, PGA_AGGREGATE_TARGET, SHARED_POOL_SIZE) instead, for a similar result.
When to use memory _ Max _ Target and memory _ target?
MEMORY_TARGET is a database initialization parameter (introduced in Oracle 11g) that can be used for automatic PGA and SGA memory sizing. MEMORY_TARGET provides the following:
What to do if database memory value is 0?
If the value is 0, your database is using manual memory management. Consult the Oracle Database Administrator’s Guide to learn how to configure an equivalent memory size using manual memory management, instead of continuing with the steps that follow.
How do I limit Oracle’s memory use?
One thing you should keep in mind is that oracle always reserves SGA_MAX_SIZE memory when you start it. If SGA_MAX_SIZE is not set but MEMORY_MAX_TARGET is, then SGA_MAX_SIZE defaults to MEMORY_MAX_TARGET. So in your example Oracle always reserves a 8G memory block when you start it, even if your MEMORY_TARGET is 4G.
When to change the memory _ target to 300 MB?
If the system uses an initialization parameter file, change the value of the MEMORY_TARGET parameter to at least 300 MB in the initialization parameter file (initsid.ora).
When to use SGA _ target and memory _ target?
If Automatic Memory Management is enabled ( MEMORY_TARGET is set to a positive value) and SGA_TARGET is also set to a positive value, the SGA_TARGET value acts as the minimum value for the size of the SGA. This parameter is optional for pluggable databases (PDBs).
How much memory does Oracle Application Express use?
Oracle Application Express requires the system global area (SGA) and program global area (PGA) to be at least 300 MB. Databases typically use automatic memory management, where the memory can be controlled by the server parameter MEMORY_TARGET.