cd examples/ledger && ./run.sh
  initdb -D /tmp/batch3-pg/b3-27 -U postgres -A trust -E UTF8 --locale=C.UTF-8 -c dynamic_shared_memory_type=mmap（仅首次）
  ../common/pg.sh start b3-27 55427
  LAB_PGPORT=55427 LAB_DB=ledger27 LAB_PG_SH=../common/pg.sh LAB_PG_NAME=b3-27 ../common/lab.sh . lab.ledger.LedgerLab
  （L10 用例内部调用 ../common/pg.sh restart-immediate b3-27 55427；L9 用例内部对子 JVM 执行 kill -9 <pid>）
  ../common/pg.sh stop b3-27
exit=0
