文档解释
ORA-10266: Trace OSD stack usage
Cause: Porters should implement this to help them debug their stack implementations. It should be used in at least smcstk().
Action: None
ORA-10266错误表明操作系统（OS）分配给指定运行堆栈越限，该堆栈被某些调用要求使用超出指定堆栈大小。
官方解释
Error: ORA-10266
TEXT: stack size string of current OS stack is string, cannot be lower than string
Cause: Operating system stack size of a given stack was lower than Oracle internal requirement.
Action: Increase the operating system stack size of the given stack, or a lower stack size can be assigned if the stack was not required by Oracle.
常见案例
ORA-10266错误通常发生在当从数据库中执行大量数据，访问复杂过程或执行复杂查询时。此时，操作系统堆栈内存将会耗尽，堆栈大小不足以支持所执行的操作，从而导致出现ORA-10266错误。
正常处理方法及步骤
1、检查堆栈大小限制条件：
可以使用ulimit -a命令检查系统限制中的堆栈大小限制条件，要确保ulimit -S | grep “stact”命令返回值大于8MB。
示例：
[root@localhost]# ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 255928
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 255928
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
2、增加系统堆栈大小：
使用ulimit -S（–）大小 命令可以增加系统堆栈大小，例如 ulmit -S 50M表示将堆栈大小提升至50M，该值越大，预防ORA-10266的发生的可能性就越大。
示例：
[root@localhost]# ulimit -S 50M
[root@localhost]# ulimit -S | grep “stack”
stack size (kbytes, -s) 51200
