{"id":84043,"date":"2026-07-26T07:49:12","date_gmt":"2026-07-25T23:49:12","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/84043.html"},"modified":"2026-07-26T07:49:12","modified_gmt":"2026-07-25T23:49:12","slug":"%e5%a6%82%e4%bd%95%e7%ae%a1%e7%90%86oracle%e6%9c%8d%e5%8a%a1%e5%99%a8%e7%9a%84%e5%86%85%e6%a0%b8%e5%85%b1%e4%ba%ab%e5%86%85%e5%ad%98_shmmax%e4%b8%8eshmall%e8%ae%a1%e7%ae%97","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/84043.html","title":{"rendered":"\u5982\u4f55\u7ba1\u7406Oracle\u670d\u52a1\u5668\u7684\u5185\u6838\u5171\u4eab\u5185\u5b58_shmmax\u4e0eshmall\u8ba1\u7b97"},"content":{"rendered":"

shmmax\u9700\u2265SGA\u6700\u5927\u503c（\u5982sga_max_size）\u5e76\u755910%\u4f59\u91cf，shmall\u9700\u2265\u6240\u6709\u5b9e\u4f8bSGA\u603b\u548c\u00f74096；RAC\u73af\u5883\u8fd8\u9700\u989d\u5916\u8003\u8651GRD\u5f00\u9500\u4e14\u5404\u8282\u70b9\u72ec\u7acb\u8ba1\u7b97；\u4fee\u6539\u540e\u987bsysctl -p\u751f\u6548\u3001\u9a8c\u8bc1ipcs -lm\u3001\u91cd\u542flistener\u4e0e\u6570\u636e\u5e93\u3002shmmax \u8bbe\u7f6e\u591a\u5c11\u624d\u591f\u7528？oracle \u5b9e\u4f8b\u542f\u52a8\u65f6\u82e5\u62a5 ora-27123: unable to attach to shared memory segment，\u516b\u6210\u662f shmmax \u592a\u5c0f\u2014\u2014\u5b83\u9650\u5236\u5355\u4e2a\u5171\u4eab\u5185\u5b58\u6bb5\u6700\u5927\u5b57\u8282\u6570，\u5fc5\u987b \u2265 oracle sga \u6700\u5927\u53ef\u80fd\u503c（\u6bd4\u5982 sga_max_size \u914d\u7f6e\u503c）\u3002\u67e5\u5f53\u524d\u503c：cat \/proc\/sys\/kernel\/shmmaxOracle \u63a8\u8350\u4e0b\u9650：\u53d6 sga_max_size（\u5355\u4f4d\u5b57\u8282）\u5411\u4e0a\u53d6\u6574\u5230 4KB \u8fb9\u754c，\u4f46\u5b9e\u9645\u5efa\u8bae\u7559 10% \u4f59\u91cf\u522b\u76f2\u76ee\u8bbe\u6210\u7269\u7406\u5185\u5b58\u4e00\u534a\u2014\u201464GB \u5185\u5b58\u8bbe 32GB shmmax \u53ef\u80fd\u5bfc\u81f4\u5176\u4ed6\u8fdb\u7a0b\u5171\u4eab\u5185\u5b58\u5931\u8d25\u5e38\u89c1\u9519\u8bef：\u628a shmmax \u8bbe\u6210 4G（\u5373 4294967296），\u4f46 Oracle \u5b9e\u9645\u9700\u8981 4.2G，\u4ecd\u4f1a\u62a5\u9519shmall \u600e\u4e48\u7b97\u624d\u4e0d\u6ea2\u51fa？shmall \u662f\u7cfb\u7edf\u7ea7\u603b\u5171\u4eab\u5185\u5b58\u9875\u6570\u4e0a\u9650（\u5355\u4f4d：\u9875，\u901a\u5e38\u4e00\u9875 = 4KB），\u5b83\u4e0d\u662f\u6309 Oracle \u5355\u5b9e\u4f8b\u7b97\u7684，\u800c\u662f\u6240\u6709\u5171\u4eab\u5185\u5b58\u6bb5\u52a0\u8d77\u6765\u4e0d\u80fd\u8d85\u8fd9\u4e2a\u9875\u6570\u3002\u516c\u5f0f： shmall \u2265 (\u6240\u6709 Oracle \u5b9e\u4f8b\u7684 SGA \u603b\u548c + \u5176\u4ed6\u5e94\u7528\u5171\u4eab\u5185\u5b58) \u00f7 4096\u67e5\u5f53\u524d\u9875\u5927\u5c0f：getconf PAGESIZE（\u7edd\u5927\u591a\u6570\u662f 4096）\u6f0f\u7b97\u70b9：RAC \u73af\u5883\u4e2d\u6bcf\u4e2a\u8282\u70b9\u90fd\u8981\u7b97；\u5982\u679c\u542f\u7528\u4e86 AMM（memory_target），\u4e5f\u8981\u8ba1\u5165，\u56e0\u4e3a AMM \u5e95\u5c42\u4ecd\u8d70 shm\u5178\u578b\u5751：\u53ea\u6309\u4e00\u4e2a\u5b9e\u4f8b\u7b97 shmall，\u4e0a\u7ebf\u7b2c\u4e8c\u4e2a\u5b9e\u4f8b\u540e ipcs -lm \u663e\u793a shmmax \u6ca1\u8d85，\u4f46 shmall \u5df2\u6ee1，\u65b0\u5b9e\u4f8b\u8d77\u4e0d\u6765\u4fee\u6539\u540e Oracle \u4e0d\u751f\u6548？\u68c0\u67e5\u8fd9\u4e09\u5904\u6539\u5b8c \/etc\/sysctl.conf \u5e76\u6267\u884c sysctl -p，\u4e0d\u4ee3\u8868 Oracle \u5c31\u80fd\u7acb\u523b\u7528\u4e0a\u65b0\u503c\u2014\u2014\u5185\u6838\u53c2\u6570\u52a0\u8f7d\u65f6\u673a\u548c Oracle \u542f\u52a8\u987a\u5e8f\u6709\u4f9d\u8d56\u5173\u7cfb\u3002 \u6587\u5c0f\u8a00 \u767e\u5ea6\u65d7\u4e0b\u65b0\u641c\u7d22\u667a\u80fd\u52a9\u624b，\u6709\u95ee\u9898，\u95ee\u5c0f\u8a00\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

shmmax\u9700\u2265SGA\u6700\u5927\u503c（\u5982sga_max_size）\u5e76\u755910%\u4f59\u91cf，shmall\u9700\u2265\u6240\u6709\u5b9e\u4f8bSGA\u603b\u548c\u00f74096；RAC\u73af\u5883\u8fd8\u9700\u989d\u5916\u8003\u8651GRD\u5f00\u9500\u4e14\u5404\u8282\u70b9\u72ec\u7acb\u8ba1\u7b97；\u4fee\u6539\u540e\u987bsysctl -p\u751f\u6548\u3001\u9a8c\u8bc1ipcs -lm\u3001\u91cd\u542flistener\u4e0e\u6570\u636e\u5e93\u3002shmmax \u8bbe\u7f6e\u591a\u5c11\u624d\u591f\u7528？oracle \u5b9e\u4f8b\u542f\u52a8\u65f6\u82e5\u62a5 ora-27123: unable to attach to shared mem<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[426,81,100],"topic":[],"class_list":["post-84043","post","type-post","status-publish","format-standard","hentry","category-server","tag-jvm","tag-python","tag-100"],"yoast_head":"\n\u5982\u4f55\u7ba1\u7406Oracle\u670d\u52a1\u5668\u7684\u5185\u6838\u5171\u4eab\u5185\u5b58_shmmax\u4e0eshmall\u8ba1\u7b97 - 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