Test a Disk for I/O write timing.
time dd if=/dev/zero of=sample.data bs=8192 count=131072
131072+0 records in
131072+0 records out
real 0m8.98s
user 0m0.10s
sys 0m6.79s
Test speed of disks – write a 1GB file and time it. Resize tablespaces including UNDO workaround
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