I\u2019m having RHEL 5 (32-bit) and MySQL-5.<\/p>\n\n\n\n
I was trying to check how much is the Memory Utilization limits for MySQL 5 on 32bit OS.<\/p>\n\n\n\n
We can easily calculate the maximum capacity of the address space is 2^32 bytes and that is where these limits come from. Max DB size: Unlimited * OS Memory Limitations:<\/strong><\/p>\n\n\n\n Maximum x86 per-process virtual address space for Red-Hat Linux Version Others: * About globally limiting memory usage by MySQL Server: Eg. max_connections, variable for specifying number of simultaneous connection, depends on OS limits to handle file handlers. No documented limit is there for the same.<\/p>\n\n\n\n <\/p>\n","protected":false},"excerpt":{"rendered":"I\u2019m having RHEL 5 (32-bit) and MySQL-5. I was trying to check how much is the Memory Utilization limits for MySQL 5 on 32bit OS. We can easily calculate the…\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[8,377,6],"tags":[59,427],"class_list":{"0":"post-321","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-mysql","7":"category-mysql-articles","8":"category-technical","9":"tag-linux","10":"tag-mysql"},"aioseo_notices":[],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/kedar.nitty-witty.com\/blog\/wp-json\/wp\/v2\/posts\/321","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kedar.nitty-witty.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kedar.nitty-witty.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kedar.nitty-witty.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kedar.nitty-witty.com\/blog\/wp-json\/wp\/v2\/comments?post=321"}],"version-history":[{"count":2,"href":"https:\/\/kedar.nitty-witty.com\/blog\/wp-json\/wp\/v2\/posts\/321\/revisions"}],"predecessor-version":[{"id":2935,"href":"https:\/\/kedar.nitty-witty.com\/blog\/wp-json\/wp\/v2\/posts\/321\/revisions\/2935"}],"wp:attachment":[{"href":"https:\/\/kedar.nitty-witty.com\/blog\/wp-json\/wp\/v2\/media?parent=321"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kedar.nitty-witty.com\/blog\/wp-json\/wp\/v2\/categories?post=321"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kedar.nitty-witty.com\/blog\/wp-json\/wp\/v2\/tags?post=321"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
* For MYSQL 5.0: Following are memory (storage) limits:<\/strong><\/p>\n\n\n\n
Max table size: MyISAM: 256TB; Innodb: 64TB
Max row size: 64 KB
Max columns per row: 4096
Max Blob\/Clob size: 4 GB (longtext, longblob)
Max CHAR size: 64 KB (text)
Max NUMBER size: 64 bits
Min DATE value: 1000
Max DATE value: 9999
Max column name size: 64<\/p>\n\n\n\n
Version 4: ~ 4GB
Version 5: ~ 3GB
* Server Parameters memory allocation limits:
<\/strong>
For following buffers:
\u2022 key_buffer_size
\u2022 join_buffer_size
\u2022 myisam_sort_buffer_size
\u2022 sort_buffer_size
– Maximum allowable setting is 4GB.
– As of MySQL 5.1.23, values larger than 4GB are allowed for 64-bit platforms.<\/p>\n\n\n\n
net_buffer_length -1MB.
read_buffer_size – 2GB.
read_rnd_buffer_size – 2GB.<\/p>\n\n\n\n
<\/strong>
MySQL is not having any other parameter that directly limits the memory usage. It\u2019s these global buffers \/ server variables are the only setting which extends \/ shrinks server memory usage limits.<\/p>\n\n\n\n