postgreSQL 常见数据页损坏坏块问题

pg 中的常见几个数据页损坏坏块问题

could not read block N of relation X/Y/Z: read only 0 of 8192 bytes
catalog is missing N attribute(s) for relid M
WARNING: page verification failed, calculated checksum %u but expected %u 
ERROR: invalid page in block %u of relation %s

这些错误大部分情况下是 存储子系统:文件系统或磁盘的问题导致， 可以考虑先冷备份整个数据文件夹，然后设置参数 zero_damaged_pages和 ignore_checksum_failure

之后使用 pg_dumpall 导出全库

可以使用 pg_catcheck 检查postgreSQL catalog字典是否存在问题：

ubuntu 


git clone https://github.com/EnterpriseDB/pg_catcheck
apt-get install libselinux-dev
apt-get install libxslt-dev
apt-get install libpam-dev
apt-get install libssl-dev
apt-get install libedit-dev
apt-get install -y libkrb5-dev

cd pg_catcheck
make 
chown postgres pg_catcheck
chmod 755 pg_catcheck

su - postgres

./pg_catcheck 
progress: done (0 inconsistencies, 0 warnings, 0 errors)