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Update 01-pkg-install.md

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docs/en/13-operation/01-pkg-install.md
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@ -150,9 +150,9 @@ There are two aspects in upgrade operation: upgrade installation package and upg
To upgrade a package, follow the steps mentioned previously to first uninstall the old version then install the new version.
Upgrading a running server is much more complex. First please check the version number of the old version and the new version. The version number of TDengine consists of 4 sections, only if the first 3 sections match can the old version be upgraded to the new version. The steps of upgrading a running server are as below:
Upgrading a running server is much more complex. First please check the version number of the old version and the new version. The version number of TDengine consists of 4 sections, only if the first 2 sections match can the old version be upgraded to the new version. The steps of upgrading a running server are as below:
- Stop inserting data
- Make sure all data is persisted to disk
- Make sure all data is persisted to disk, please use command `flush database`
- Stop the cluster of TDengine
- Uninstall old version and install new version
- Start the cluster of TDengine