Cov txheej txheem:

Dab tsi yog xauv hauv db2?
Dab tsi yog xauv hauv db2?

Video: Dab tsi yog xauv hauv db2?

Video: Dab tsi yog xauv hauv db2?
Video: Tim dab tsi ? 7/17/2017 2024, Kaum ib hlis
Anonim

Ib database xauv yog ib tug mechanism siv los ntawm Db 2 los tswj kev nkag mus rau cov khoom siv database ntawm cov kev sib txawv. Hauv qab no yog cov npe ntawm cov khoom uas Db 2 feem ntau regulates ntawm kev siv ntawm xauv : - Rooj. - Rooj faib.

Ntawm no, hom xauv npo yog dab tsi?

Cov hom ntawm a xauv qhia dab tsi nkag mus rau kaw khoom raug tso cai rau lub xauv tus tswv thiab rau tej txheej txheem concurrent. db2 siv xauv hom los txiav txim seb ib tug xauv yog sib xws nrog lwm tus. Nws yuav tsum tau tos kom txog thaum txheej txheem A tso nws xauv , thiab kom txog rau thaum tag nrho lwm yam uas twb muaj lawm incompatible xauv raug tso tawm.

Dab tsi yog qhov sib cais theem hauv db2? Hauv DB2 koj tuaj yeem hais qhia plaub theem kev cais tawm hauv qab no:

  • cursor stability (CS),
  • rov nyeem tau (RR),
  • nyeem stability (RS), thiab.
  • nyeem tsis tau ntawv (UR).

Kuj nug, dab tsi yog qhov ntsuas phoo hauv db2?

Xauv escalation koom nrog tau txais ib lub rooj lossis rooj qhov chaw xauv , ces tso tag nrho cov nplooj ntawv los yog kab xauv . Xauv escalation yog qhov kev ruaj ntseg valve uas DB 2 muab nyob rau hauv rooj plaub uas ib daim ntawv thov overuses system cov kev pab.

Dab tsi yog qhov txawv ntawm cov xauv?

Txawm hais tias muaj ntau hom xauv, plaub feem ntau yog padlocks, deadbolts, knoblocks, thiab levers

  • Padlocks.
  • Deadbolts.
  • Knob Locks.
  • Lever Handle Locks.
  • Cam xauv.
  • Rim / Mortise Locks.
  • Euro Profile Lub tog raj kheej.
  • Phab ntsa Mounted Locks.

Pom zoo: