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  1.  Home
  2. JAVA400-L
  3. July 2003

RE: DASD spike on a JT-Open insert?

> From: David Gibbs
>
> Anyone know what might cause a huge spike in dasd utilization when a jdbc
> insert operation is performed?
>
> We're using JTOpen 4.0 connected to a V5R2 system ... reasonably
> current on cume and database group ptf's.
>
> By spike, I mean the utilization went from around 75% to 99.4%!  Once the
> host server job was canceled, utilization dropped down to 75% again.

It sounds like a memory problem.  Did you run WRKSYSSTS and check your
"current unprotect used" field?  That's the storage that goes up when lots
of "temporary" objects are being created, which includes Java classes.

If that's the case, it definitely implicates the JVM.  Next is to figure out
what the INSERT is doing.  Is this some sort of block insert, or just one
record?

Joe

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