Update usage scenarios for placement-rules-in-sql.md (#11999) (#12024)

pingcap · Jan 12, 2023 · 2109401 · 2109401
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diff --git a/placement-rules-in-sql.md b/placement-rules-in-sql.md
@@ -18,6 +18,7 @@ The detailed user scenarios are as follows:
 - Store new data into NVMe storage and store old data into SSDs to lower the cost on data archiving and storage
 - Schedule the leaders of hotspot data to high-performance TiKV instances
 - Separate cold data to lower-cost storage mediums to improve cost efficiency
+- Support the physical isolation of computing resources between different users, which meets the isolation requirements of different users in a cluster, and the isolation requirements of CPU, I/O, memory, and other resources with different mixed loads
 
 ## Specify placement rules