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Locks [Oracle] | ||
Lock modes
There are five lock modes in Oracle. The absence of a lock (which can be counted as sixth lock type) is called a null lock.
null
Abbreviation: NL
row shared
Abbreviation: SS
row exclusive
Abbreviation RX(?) or SX. SX apaprently stands for subexclusive lock.
share
Abbreviation: S
share row exclusive
Abbreviation: SRX(?) or SSX
exclusive
Abbreviation: X
Lock typesTransaction Lock
Abbreviation: TX
TM ??Thread checkpoint enqueue
Abbreviation: TC
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