查看Oracle latch _spin_count默认值
SELECT X.KSPPINM NAME, Y.KSPFTCTXVL VALUE, Y.KSPFTCTXDF ISDEFAULT
FROM SYS.X$KSPPI X, SYS.X$KSPPCV2 Y
WHERE X.INST_ID = USERENV('Instance')
AND Y.INST_ID = USERENV('Instance')
AND X.INDX + 1 = Y.KSPFTCTXPN
AND X.KSPPINM = '_spin_count'
ORDER BY X.KSPPINM;