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DonHoe · Feb 26, 2024 · 823b3c0 · 823b3c0
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diff --git a/docs/chapter/database/postgresql.md b/docs/chapter/database/postgresql.md
@@ -23,6 +23,10 @@ SELECT (DATE '2001-02-16', DATE '2001-12-21') OVERLAPS
 
 -- 手动释放空间
 VACUUM FULL VERBOSE ANALYZE;
+-- 查看可用扩展
+SELECT * FROM pg_available_extensions;
+-- 高效字符串索引
+create index if not exists idx_table_on_column on 'table' using gin ('column' gin_trgm_ops)
 ```
 
 2. 类型转换

diff --git a/docs/chapter/devops/ffmpeg.md b/docs/chapter/devops/ffmpeg.md
@@ -49,4 +49,12 @@ ffmpeg -i input.mp4 -c:v libx264 -c:a aac -crf 23 -preset medium output.mp4
 
 ```
 ffmpeg -re -i 'input.mp4' -vcodec libx264 -acodec aac -f flv  rtmp://127.0.0.1:1938/live/test
+```
+
+## 硬件加速
+```bash
+# 查看支持的加速模式
+ffmpeg -hwaccels
+# 启用加速，nv显卡
+ffmpeg -hwaccel cuda
 ```