ORA-00384: Insufficient memory to grow cache Set SGA_TARGET to a nonzero value in the initialization parameter file (pfile). Start the DB using below command srvctl start database -d
DB_CACHE_SIZE = integer [K | M | G] Default value. But when I change the db_cache_size parameter alter system set db_cache_size =4m ; SQL> System altered. For example: sga_target = 1000M means I'll share out that 1000M, and if I need (say) more shared pool, the database can shrink the buffer cache down to whatever it wants to meet that need. * For Oracle 9 onwards: increate the initialisation parameter DB_CACHE_SIZE.” If the Buffer Cache is well tuned and no full table scans run in the database, this Ratio must be grater than 90%. Hi, u need to be restart the oracle instance for increasing the db_cache_size if sga_max_size is not define or its size is not enough to fit the new value. If any value is set to any auto tuned pools after switching to ASMM, that value would be a lower memory threshold for that pool. SQL> alter system set db_4k_cache_size=800M; alter system set db_4k_cache_size=800M * ERROR at line 1: ORA-02097: parameter cannot be modified because specified value is invalid ORA-00384: Insufficient memory to grow cache Cause of The Problem:-----This problem can be raised for several reasons. If SGA_TARGET is not set (32-bit platforms): 32 MB, rounded up to the nearest granule size. alter system set db_cache_size=64M … The value must be at least 4M * number of cpus * granule size (smaller values are automatically rounded up to this value). Let's me show you some examples that can reproduce ORA-02097 and I will explain it more detailed along with the context..
This gives some headroom allowing you to increase the data cache online and see the result (alter system set db_cache_size=
1)SGA_MAX_SIZE is not set db_cache_size & db_16k_cache_size parameter is set for while accessing the data from the 16k object, for that object to hold the data we need to set the db_16k_cache_size parameter. Here I would like to change DB_RECOVERY_FILE_DEST location. db_cache_size big integer 16G db_keep_cache_size big integer 16G db_recycle_cache_size big integer 0 The RDA shows : ksmg_granule_size 268435456 (= 256M) and the machine has many CPUs. A user-specified value larger than this is rounded up to the nearest granule size. Effect of the alter system should be for the instance only . A user-specified value larger than this is rounded up to the nearest granule size. DB_CACHE_SIZE specifies the size of the DEFAULT buffer pool for buffers with the primary block size (the block size defined by the DB_BLOCK_SIZE initialization parameter). I executed the following command on our Oracle 9.2.0 RACed database on Compaq TRU64 Unix: Reduced db_cache_size from 1008M to 608M: alter system set db_cache_size = 629145600 scope=both sid='dbx2'; The db_cache_size did get reduced, but I did not see any memory freed to the o/s - does thit not happen instantaneously ? If SGA_TARGET is set: If the parameter is not specified, then the default is 0 (internally determined by the Oracle Database).
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