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Update 02-database.md

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docs/en/12-taos-sql/02-database.md
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@ -138,6 +138,10 @@ You can use `show <db_name>.vgroups;` to check the value of cacheload.
If the value of `cacheload` is very close to the value of `cachesize`, then it's very probably that `cachesize` is too small. If the value of `cacheload` is much smaller than the value of `cachesize`, then `cachesize` is big enough. You can use this simple principle to determine. Depending on how much memory is available in your system, you can choose to double `cachesize` or incrase it by even 5 or more times.
4. stt_trigger
Pleae make sure stopping data writing before trying to alter stt_trigger parameter.
:::note
Other parameters cannot be modified after the database has been created.