Answer: you will obtain a ORA-00845 error if your mutual memory record system is not large enough come accommodate memory_target and also memory_max_target. There space two feasible ways to eliminate the ORA-00845 error:
- alleviate the worth for the memory_target parameter
- boost the short-lived memory allocation on the server. This have to fix the ORA-00845 error:
# umount tmpfs# mountain -t tmpfs shmfs -o size=1500m /dev/shm
The oerr blog post ORA-00845 addresses this error:
ORA-00845: MEMORY_TARGET not supported on this system Cause: The MEMORY_TARGET parameter was not sustained on this operating device or /dev/shm was no sized appropriately on Linux. Action: describe documentation because that a list of sustained operating systems. Or, size /dev/shm to be at the very least the SGA_MAX_SIZE on each Oracle instance running top top the system.
Oracle claims that if you want to usage Linux HugePages make certain that both MEMORY_TARGET / MEMORY_MAX_TARGET initialization parameters are disabled for the database instance. AMM is a memory-morphing device that adjusts the sizes of the SGA pool reactively, as workloads change. It functions well on small systems, however for large databases, the DBA can perform theSGA pool size adjustment proactively, before a workload readjust cripples performance.Oracle does not recommend making use of Automatic Memory management (AMM, e.g. Setup memory_target) v Linux hugepages. See MOSC note 749851.1 "HugePages and also Oracle Database 11g automatic Memory management (AMM) top top Linux" for necessary details. In sum, AMM is no compatible with Linux Hugepages. Also, beware thatAMM re-size operations deserve to cripple Oracle power in some cases.For mission-critical databases, ns recommend structure intelligent SGA monitors the predict workload changes before they occur and change the SGA just-in-time. For complete details, see my bookOracle Tuning: The critical Reference.
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Note: When using AMM (by setup memory_target, and/or sga_target, the worths for the "traditional" swimming pool parameters (db_cache_size, shared_pool_size, &c) are not ignored. Rather, they will certainly specify the minimum dimension that Oracle will always maintain because that each sub-area in the SGA.
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Note: This Oracle documentation was produced as a support and Oracle training reference for use by our DBA performance tuning consulting professionals. Feel free to ask concerns on ourOracle forum.Verify experience! Anyone considering utilizing the services of an Oracle support skilled should individually investigate their credentials and also experience, and also not rely on advertisements and self-proclaimed expertise. All legitimate Oracle specialists publish your Oracle qualifications. Errata? Oracle technology is changing and we strive to upgrade our BC Oracle support information.
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