本文介绍如何检查复制/抽取进程的读写位置、是否正在恢复，以及是否已处理所有源记录，包括展示检查点详情、启动检查点、恢复检查点和当前检查点等关键步骤。
Viewing extract/replicat's read/write position and whether it's in recovery - must be in running:
send xxx status
Whether or not extract/replicat has processed all the records from the source
send xxx logend
Show checkpoint details
info xxx showch
TRANLOGOPTIONS ASMUSER SYS@<ASM_instance>, ASMPASSWORD <password>
使用ASM管理存储时必须加上该命令。 常规的DBUSER也不能省略。
Startup checkpoints: The first checkpoint that is made in the data source when the process starts.
Recovery checkpoints: The position in the data source of the record containing the oldest transaction not yet processed by Extract.
Current checkpoint: The position of the last record read by Extract in the data source. This should match the Log Read Checkpoint statistic shown in the summary and in the basic INFO EXTRACT command without options.
HANDLECOLLISIONS
replicat的参数文件用到，GG将尝试解决重复/丢失记录的问题。
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