__db_cache_size 83886080 Actual size of DEFAULT buffer pool for s tandard block size buffers db_cache_size 0 Size of DEFAULT buffer pool for standard block size buffers 从上面结果中黑体部分可以看到,这些由两个下划线开头的参数决定了当前SGA的分配,也是动态内存管理调整的参数。这些参数的更改会被记录...
__db_cache_size 83886080 Actual size of DEFAULT buffer pool for s tandard block size buffers db_cache_size 0 Size of DEFAULT buffer pool for standard block size buffers 从上面结果中黑体部分可以看到,这些由两个下划线开头的参数决定了当前SGA的分配,也是动态内存管理调整的参数。这些参数的更改会被记录...
这个是因为使用了自动内存管理，这些参数由数据库统一调度动态设置，显示为0是因为你没有设置它们的最小值，设置了最小值之后就会显示你设置的值。最好让系统根据数据库运行情况自动改变这些参数的大小，这是oracle数据库的优点。如果取消这个功能的话，也不能人工动态的改变这些参数，每一次改变都需要重启...
db_cache_size big integer 0 db_keep_cache_size big integer 0 db_recycle_cache_size big integer 0 调整成功,注意这里的一个现象,设置的是1M大小,系统会自动将这个数值进行调整,调整的依据是:values greater than zero are automatically modified to be either the user-specified-size rounded up to granu...
db_16k_cache_size big integer 0 db_2k_cache_size big integer 0 db_32k_cache_size big integer 0 db_4k_cache_size big integer 0 db_8k_cache_size big integer 0 db_cache_size big integer 0 db_flash_cache_size big integer 0 db_keep_cache_size big integer 0 ...
DB_CACHE_SIZE = integer [K | M |G] Default value If SGA_TARGET is set: If the parameter is not specified, then the default is 0 (internally determined by the Oracle Database). If the parameter is specified, then the user-specified value indicates a minimum value for the memory pool....
某次配置11.2.0.4RAC 系统的db_cache_size和shared_pool_size时,SGA_TARGET大小72G,设置db_cache_size 62G, shared_pool_size 10G,结果RAC集群无法启动,检查单实例STARTUP时出现ORA-04031shared pool太小错误,一直很奇怪平时32G内存的主机,shared_pool_size一般2G也够用了,为什么sga_target增加了,...
public classDbCacheSizeextends java.lang.Object Estimates the in-memory cache size needed to hold a specified data set. To get an estimate of the in-memory footprint for a given database, specify the number of records and database characteristics and DbCacheSize will return an estimate of th...
DB_KEEP_CACHE_SIZE specifies the size of the KEEP buffer pool. The size of the buffers in the KEEP buffer pool is the primary block size (the block size defined by the DB_BLOCK_SIZE initialization parameter)。中文意思：DB_KEEP_CACHE_SIZE指定保持缓冲池的大小。保持缓冲的缓冲池的...