Checkpoint Process (CKPT) (119)

本文详细解释了Oracle数据库中检查点(checkpoint)的工作原理。在检查点发生时,Oracle通过CKPT进程更新所有数据文件的头部信息以记录检查点详情。DBWR检查点统计信息反映了已完成的检查点请求的数量。

When a checkpoint occurs, Oracle must update the headers of all datafiles to record
the details of the checkpoint. This is done by the CKPT process. The CKPT process
does not write blocks to disk; DBWn always performs that work.
The statistic DBWR checkpoints displayed by the System_Statistics monitor in
Enterprise Manager indicates the number of checkpoint requests completed.

检查点进程
当检查点发生时 , Oracle将更新所有数据文件的头来记录检查点 .
后面这句话什么意思 ? 哪位大侠告诉我一下 , 谢谢.

[@more@]

来自 “ ITPUB博客 ” ,链接:http://blog.itpub.net/10599713/viewspace-979926/,如需转载,请注明出处,否则将追究法律责任。

转载于:http://blog.itpub.net/10599713/viewspace-979926/

D:\softprogram\Python\anaconda\envs\kag\python.exe -X pycache_prefix=C:\Users\Lenovo\AppData\Local\JetBrains\PyCharmCE2024.1\cpython-cache "D:/softprogram/Python/pycharm/PyCharm Community Edition 2024.1.1/plugins/python-ce/helpers/pydev/pydevd.py" --multiprocess --qt-support=auto --client 127.0.0.1 --port 55243 --file D:\softprogram\Python\project\lunwen\kag\KAG-master\kag\examples\TwoWikiTest\builder\indexer.py Connected to pydev debugger (build 241.15989.155) found config file: D:\softprogram\Python\project\lunwen\kag\KAG-master\kag\examples\TwoWikiTest\kag_config.yaml Done initialize project config with host addr http://127.0.0.1:8887 and project_id 3 Done init config from local file: set KAG_DEBUG_DUMP_CONFIG=1 to dump config Existing checkpoint found in ckpt\reader, with 3 records. Existing checkpoint found in ckpt\splitter, with 3 records. Existing checkpoint found in ckpt\extractor, with 3 records. Existing checkpoint found in ckpt, with 3 records. Existing checkpoint found in ckpt\chain, with 3 records. Processing D:\softprogram\Python\project\lunwen\kag\KAG-master\kag\examples\TwoWikiTest\builder\data/2wiki_sub_corpus.json There are total 3 data to process, worker 0/1 will process range [0, 3) Progress: 0it [00:00, ?it/s] Done process 0 records, with 0 successfully processed and 0 failures encountered. The log file is located at ckpt\kag_checkpoint_0_1.ckpt. Please access this file to obtain detailed task statistics. INFO:__main__: buildKB successfully for D:\softprogram\Python\project\lunwen\kag\KAG-master\kag\examples\TwoWikiTest\builder\data/2wiki_sub_corpus.json
04-03
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