5.5GB of memory - sybase user can only use 2.75GB

[TD Clark]

We approx 5.5GB of physical memory on a sybase server; however, the sybase user (sybase servers are run as the sybase user) can only use 2.75GB. Below are some current kernel parameters:
shmseg 120
shmmax 3.45GB
unlockable_mem 8192

Any ideas would be appreciated!

[A. Clay Stephenson · Accepted solution]

First, I assume that you are running 64-bit code.

Check the setting of maxdsiz_64bit. You could also be limited by the amount of virtual memory
so an increase in swapspace or making sure that swapmem_on=1 is set.

[eran maor]

Hi Todd

i will also check the kernel param : dbc_max_pct .

i will advise you to reduce it to 10% .

[eran maor]

sorry for not giving and explen what is this param :
dbc_max_pct defines the maximum percentage of memory to be used by dynamic buffer cache.

also check the dbc_min_pct to see that he is not more then 5% .