PostgreSQL 在计数行查询期间崩溃

目前我只有两张桌子——一张可以正常工作的小桌子，另一张可能很大。当我尝试在 pgAdmin 中找出行数时，出现以下错误：

The application has lost the database connection:
⁃ If the connection was idle it may have been forcibly disconnected.
⁃ The application server or database server may have been restarted.
⁃ The user session may have timed out.
Do you want to continue and establish a new session?

我还检查了 Postgres 服务器日志：

2020-03-30 03:06:06.764 MSK [37356] LOG:  server process (PID 30712) was terminated by signal 9: Killed: 9
2020-03-30 03:06:06.764 MSK [37356] DETAIL:  Failed process was running: SELECT COUNT(*)::text FROM ios.task_info;
2020-03-30 03:06:06.764 MSK [37356] LOG:  terminating any other active server processes
2020-03-30 03:06:06.765 MSK [30810] WARNING:  terminating connection because of crash of another server process
2020-03-30 03:06:06.765 MSK [30810] DETAIL:  The postmaster has commanded this server process to roll back the current transaction and exit, because another server process exited abnormally and possibly corrupted shared memory.
2020-03-30 03:06:06.765 MSK [30810] HINT:  In a moment you should be able to reconnect to the database and repeat your command.
2020-03-30 03:06:06.765 MSK [30709] WARNING:  terminating connection because of crash of another server process
2020-03-30 03:06:06.765 MSK [30709] DETAIL:  The postmaster has commanded this server process to roll back the current transaction and exit, because another server process exited abnormally and possibly corrupted shared memory.
2020-03-30 03:06:06.765 MSK [30709] HINT:  In a moment you should be able to reconnect to the database and repeat your command.
2020-03-30 03:06:06.767 MSK [37356] LOG:  all server processes terminated; reinitializing
2020-03-30 03:06:06.776 MSK [30816] LOG:  database system was interrupted; last known up at 2020-03-30 02:51:14 MSK
2020-03-30 03:06:06.818 MSK [30817] FATAL:  the database system is in recovery mode
2020-03-30 03:06:06.853 MSK [30816] LOG:  database system was not properly shut down; automatic recovery in progress
2020-03-30 03:06:06.855 MSK [30816] LOG:  redo starts at 0/4F4DE850
2020-03-30 03:06:06.855 MSK [30816] LOG:  invalid record length at 0/4F4DE888: wanted 24, got 0
2020-03-30 03:06:06.855 MSK [30816] LOG:  redo done at 0/4F4DE850
2020-03-30 03:06:06.862 MSK [37356] LOG:  database system is ready to accept connections

我在我的 OS X Catalina 笔记本电脑上运行所有东西并使用 PostgreSQL 12 EnterpriseDB。

以防万一它很重要 - 我创建了一个大表COPY，在我的 Python 脚本中发送了几个大型 CSV 查询。这些错误的原因是什么？