Provided by: postgresql-doc-12_12.22-0ubuntu0.20.04.4_all 

NAME
SPI_start_transaction - obsolete function
SYNOPSIS
void SPI_start_transaction(void)
DESCRIPTION
SPI_start_transaction does nothing, and exists only for code compatibility with earlier PostgreSQL releases. It used to be required after calling SPI_commit or SPI_rollback, but now those functions start a new transaction automatically. PostgreSQL 12.22 2024 SPI_START_TRANSACTION(3)