There are two JSON data types: <type>json</> and <type>jsonb</>.

Both accept <emphasis>almost</emphasis> identical sets of values as

input. The major practical difference is one of efficiency. The

<type>json</> data type stores an exact copy of thetheinput text,

<type>json</> data type stores an exact copy of the input text,

which processing functions must continually reparse, while

<type>jsonb</> data is stored in a decomposed binary format that

makes it slightly less efficient to input due to added serialization

</indexterm>

<title>Logical Decoding</title>

<para>

Logical decoding is thetheprocess of extracting all persistent changes

Logical decoding is the process of extracting all persistent changes

to a database's tables into a coherent, easy to understand format which

can be interpreted without detailed knowledge of the database's internal

state.