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ddhodge merged 2 commits into from
Dec 1, 2025
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[doc] Units for ASH buffer size #29533

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Units for ASH buffer size
ddhodge Nov 29, 2025
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ddhodge Dec 1, 2025
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2 changes: 1 addition & 1 deletion ...nt/stable/launch-and-manage/monitor-and-alert/active-session-history-monitor.md
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Expand Up @@ -35,7 +35,7 @@ To configure ASH, you can set the following YB-TServer flags for each node of yo
| Flag | Description |
| :--- | :---------- |
| ysql_yb_enable_ash | Enables ASH. Changing this flag requires a TServer restart. Default: true |
| ysql_yb_ash_circular_buffer_size | Size (in KiB) of circular buffer where the samples are stored. <br> Defaults:<ul><li>32 MiB for 1-2 cores</li><li>64 MiB for 3-4 cores</li><li>128 MiB for 5-8 cores</li><li>256 MiB for 9-16 cores</li><li>512 MiB for 17-32 cores</li><li>1024 MiB for more than 32 cores</li></ul> Changing this flag requires a TServer restart. |
| ysql_yb_ash_circular_buffer_size | Size (in KiB) of circular buffer where the samples are stored. <br> Defaults:<ul><li>32768 (32 MiB) for 1-2 cores</li><li>65536 (64 MiB) for 3-4 cores</li><li>131072 (128 MiB) for 5-8 cores</li><li>262144 (256 MiB) for 9-16 cores</li><li>524288 (512 MiB) for 17-32 cores</li><li>1048576 (1024 MiB) for more than 32 cores</li></ul> Changing this flag requires a TServer restart. |
| ysql_yb_ash_sampling_interval_ms | Sampling interval (in milliseconds). Changing this flag doesn't require a TServer restart. Default: 1000 |
| ysql_yb_ash_sample_size | Maximum number of events captured per sampling interval. Changing this flag doesn't require a TServer restart. Default: 500 |

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2 changes: 1 addition & 1 deletion ...ent/v2.25/launch-and-manage/monitor-and-alert/active-session-history-monitor.md
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Expand Up @@ -33,7 +33,7 @@ To configure ASH, you can set the following YB-TServer flags for each node of yo
| Flag | Description |
| :--- | :---------- |
| ysql_yb_enable_ash | Enables ASH. Changing this flag requires a TServer restart. Default: true |
| ysql_yb_ash_circular_buffer_size | Size (in KiB) of circular buffer where the samples are stored. <br> Defaults:<ul><li>32 MiB for 1-2 cores</li><li>64 MiB for 3-4 cores</li><li>128 MiB for 5-8 cores</li><li>256 MiB for 9-16 cores</li><li>512 MiB for 17-32 cores</li><li>1024 MiB for more than 32 cores</li></ul> Changing this flag requires a TServer restart. |
| ysql_yb_ash_circular_buffer_size | Size (in KiB) of circular buffer where the samples are stored. <br> Defaults:<ul><li>32768 (32 MiB) for 1-2 cores</li><li>65536 (64 MiB) for 3-4 cores</li><li>131072 (128 MiB) for 5-8 cores</li><li>262144 (256 MiB) for 9-16 cores</li><li>524288 (512 MiB) for 17-32 cores</li><li>1048576 (1024 MiB) for more than 32 cores</li></ul> Changing this flag requires a TServer restart. |
| ysql_yb_ash_sampling_interval_ms | Sampling interval (in milliseconds). Changing this flag doesn't require a TServer restart. Default: 1000 |
| ysql_yb_ash_sample_size | Maximum number of events captured per sampling interval. Changing this flag doesn't require a TServer restart. Default: 500 |

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2 changes: 1 addition & 1 deletion ...t/v2024.2/launch-and-manage/monitor-and-alert/active-session-history-monitor.md
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Expand Up @@ -37,7 +37,7 @@ To configure ASH, you can set the following YB-TServer flags for each node of yo
| Flag | Description |
| :--- | :---------- |
| ysql_yb_enable_ash | Enables ASH. Changing this flag requires a TServer restart. Default: true |
| ysql_yb_ash_circular_buffer_size | Size (in KiB) of circular buffer where the samples are stored. <br> Defaults:<ul><li>32 MiB for 1-2 cores</li><li>64 MiB for 3-4 cores</li><li>128 MiB for 5-8 cores</li><li>256 MiB for 9-16 cores</li><li>512 MiB for 17-32 cores</li><li>1024 MiB for more than 32 cores</li></ul> Changing this flag requires a TServer restart. |
| ysql_yb_ash_circular_buffer_size | Size (in KiB) of circular buffer where the samples are stored. <br> Defaults:<ul><li>32768 (32 MiB) for 1-2 cores</li><li>65536 (64 MiB) for 3-4 cores</li><li>131072 (128 MiB) for 5-8 cores</li><li>262144 (256 MiB) for 9-16 cores</li><li>524288 (512 MiB) for 17-32 cores</li><li>1048576 (1024 MiB) for more than 32 cores</li></ul> Changing this flag requires a TServer restart. |
| ysql_yb_ash_sampling_interval_ms | Sampling interval (in milliseconds). Changing this flag doesn't require a TServer restart. Default: 1000 |
| ysql_yb_ash_sample_size | Maximum number of events captured per sampling interval. Changing this flag doesn't require a TServer restart. Default: 500 |

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