Isolation Levels

Serializable

Serializable blocks every named anomaly label in the toy matrix.

highlighted = computed this step

Serializable

Serializable is the top named level in this toy order. Inside the pinned anomaly set, every listed anomaly is blocked.

serializable row\text{serializable row}

No listed label remains allowed

The serializable row blocks 4 labels and allows 0 labels.

blocked=4,allowed=0\text{blocked}=4,\quad \text{allowed}=0

isolation levels are rendered as a tiny pedagogical matrix over named anomalies only; ANSI completeness, vendor behavior, performance, and operational guarantees are out of scope.

Serializableleveldirty_readnon_repeatable_readlost_updatewrite_skewread_committedblockedallowedallowedallowedrepeatable_readblockedblockedallowedallowedsnapshot_isolationblockedblockedblockedallowedserializableblockedblockedblockedblocked blocked versus allowedlevelblockedCountblockedallowedCountallowedread_committed1dirty_read3non_repeatable_read, lost_update, write_skewrepeatable_read2dirty_read, non_repeatable_read2lost_update, write_skewsnapshot_isolation3dirty_read, non_repeatable_read, lost_update1write_skewserializable4dirty_read, non_repeatable_read, lost_update, write_skew0none stronger-than cover edgesstrongerweakerrepeatable_readread_committedsnapshot_isolationrepeatable_readserializablesnapshot_isolation

Summary

Serializable closes the toy matrix over the named anomaly labels. Note: this row is not a performance or availability statement.

all named labels blocked\text{all named labels blocked}