What namedDb.readOnly exactly do ?

[Radosław Twardy]

What namedDb.readOnly exactly do ?

I wonder what is difference in performannce between:

namedDb.readOnly {
     implicit session =>
        sql1.execute().apply()

        sql2.execute().apply()

        sql3.execute().apply()

}

and

namedDb.readOnly {
     implicit session =>
        sql1.execute().apply()

}

namedDb.readOnly {
     implicit session =>

        sql2.execute().apply()

}

namedDb.readOnly {
     implicit session =>

        sql3.execute().apply()

}