[[["易于理解","easyToUnderstand","thumb-up"],["解决了我的问题","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["很难理解","hardToUnderstand","thumb-down"],["信息或示例代码不正确","incorrectInformationOrSampleCode","thumb-down"],["没有我需要的信息/示例","missingTheInformationSamplesINeed","thumb-down"],["翻译问题","translationIssue","thumb-down"],["其他","otherDown","thumb-down"]],["最后更新时间 (UTC)：2025-08-27。"],[[["\u003cp\u003eKey Visualizer displays diagnostic messages above heatmaps to identify performance issues or potential data inaccuracies.\u003c/p\u003e\n"],["\u003cp\u003eHigh read pressure and high write pressure messages indicate performance bottlenecks in specific key ranges, and can be further designated to be an issue with individual rows.\u003c/p\u003e\n"],["\u003cp\u003eThe large rows message highlights if any rows exceed 256 MB of data or if any key ranges average over 200 MB per row.\u003c/p\u003e\n"],["\u003cp\u003eThe "No data scanned" message signifies the lack of performance data for the table, often due to the table being empty.\u003c/p\u003e\n"],["\u003cp\u003e"Values per row are approximate" indicates data could be inaccurate, particularly for metrics like Read CPU and Write CPU, if rapid data changes impact more than 5% of performance data.\u003c/p\u003e\n"]]],[],null,["# Key Visualizer diagnostic messages\n==================================\n\nThis page describes the diagnostic messages that Key Visualizer can display\nabove a heatmap. Some diagnostic messages identify performance issues with the\nBigtable table. Other messages highlight possible inaccuracies in the\nperformance data that you should consider as you review the Key Visualizer scan.\n\n\nBefore you read this page, you should be familiar with the\n[overview of Key Visualizer](/bigtable/docs/keyvis-overview).\n\nHigh read pressure\n------------------\n\nThe **High read pressure** message indicates that some key ranges in the table\nexperienced high read pressure. See [Warnings](/bigtable/docs/keyvis-metrics#warnings) for\ndetails.\n\n\nThis diagnostic message normally includes a **Warning**\nicon. If the issue was\ncaused by individual rows, rather than a range of rows, the message includes a **Danger**\nicon.\n\nHigh write pressure\n-------------------\n\nThe **High write pressure** message indicates that some key ranges in the table\nexperienced high write pressure. See [Warnings](/bigtable/docs/keyvis-metrics#warnings) for\ndetails.\n\n\nThis diagnostic message normally includes a **Warning**\nicon. If the issue was\ncaused by individual rows, rather than a range of rows, the message includes a **Danger**\nicon.\n\nLarge rows\n----------\n\nThe **Large rows** message indicates that some of the rows in the table contain\nmore than 256 MB of data or that some key ranges contain an\naverage of more than 200 MB of data per row.\n\nNo data scanned\n---------------\n\nThe **No data scanned** message indicates that Key Visualizer did not find any\nperformance data for the table. This message normally appears if the table does\nnot contain any data.\n\nKey space not to scale\n----------------------\n\nThe **Key space not to scale** message indicates that Key Visualizer could not\nevenly distribute the table's row keys into a smaller number of key buckets.\nSee [Key buckets](/bigtable/docs/keyvis-overview#key-buckets) for details.\n\nThis message normally appears if the table contains a small number of rows.\n| **Note:** Key space distribution is not related to how Bigtable stores your data. It merely reflects how Key Visualizer depicts the keys vertically.\n\nValues per row are approximate\n------------------------------\n\nThe **Values per row are approximate** message indicates that the heatmap may\ncontain inaccurate data for metrics that are expressed as per-row values. For\nexample, the **Read CPU** and **Write CPU** metrics measure the CPU usage per\nrow, so they are affected by this message.\n\nThis message appears if data in a table is growing or changing rapidly, and if\nmore than 5% of Key Visualizer's performance data is affected as a result.\n\nNot all details shown in tooltip\n--------------------------------\n\nThe **Not all details shown in tooltip** message indicates that there was a very\nlarge number of row keys or key ranges that generated warnings. As a result,\ndetails are not available for all of the warnings. Key Visualizer's tooltips\nwill show detailed information only for the most recent warnings.\n\nWhat's next\n-----------\n\n- [Get started with Key Visualizer](/bigtable/docs/keyvis-getting-started).\n- Learn [how Key Visualizer displays data in heatmaps](/bigtable/docs/keyvis-overview#heatmaps).\n- Find out [how to explore Key Visualizer heatmaps](/bigtable/docs/keyvis-exploring-heatmaps)."]]
图标。如果问题是由个别行而不是某一特定范围的行引起的，则该消息会包含一个危险 
图标。