Hi,
Im a newbie to the scratchdisk concept. Can someone pl. tell me how it functions.
Thanks in advance.
AR
What is scratchdisk?
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"Scratch disk" is a term that means disk space used temporarily for whatever function might be required, for example to capture the output of a command or query, temporary storage of heaps for sorting, and so on.
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Swap space is actually something different. Swap space is disk used for memory pages that are not presently in use.
Temp space pointed to be UVTEMP is only relevant for server jobs. In parallel jobs separate scratch space is allocated for each processing node in the configuration file under which the job runs.
Temp space pointed to be UVTEMP is only relevant for server jobs. In parallel jobs separate scratch space is allocated for each processing node in the configuration file under which the job runs.
IBM Software Services Group
Any contribution to this forum is my own opinion and does not necessarily reflect any position that IBM may hold.
Any contribution to this forum is my own opinion and does not necessarily reflect any position that IBM may hold.
Re: What is scratchdisk?
adityaram wrote:Hi,
Im a newbie to the scratchdisk concept. Can someone pl. tell me how it functions.
Thanks in advance.
AR
kaziz wrote: scratchdisk is a term came from Torrent's Orchestrate now Datastage's Parallel Extender. It is the disk space set aside for operation such as sorting or hashing data while processing.
It is defined in configuration file for PX. Orchdisk is permanent disk space such as for datasets. Whereas scratch is not persistent, it is temporary.
Usually on MPP systems these are not NFS mounted, so each node has its own Scratchdisk space.
See APT_CONFIG_FILE env variable pointing to configuration file. Look for scratchdisk defined in node stanza.
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