A configuration item may be an environment variable or a change in the database configuration, such as its memory allocation.
配置项可以是环境变量或者数据库配置修改，例如数据库的内存分配。
The allocation is considered the largest variable cost in an uncontested lock operation.
该分配被认为是无争用锁定操作中最大的可变开销。
The PSALLOC environment variable controls the mechanism of allocation.
PSALLOC环境变量控制分配机制。
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