If you’re working with Oracle databases and hit this error:<\/p>\n\n\n\n
ORA-00059: maximum number of DB_FILES exceeded\n<\/code><\/code><\/pre>\n\n\n\nDon\u2019t worry \u2014 this just means your database has reached its configured limit for how many datafiles it can manage. This guide will show you why it happens<\/strong>, how to reproduce it<\/strong>, and how to fix it step-by-step<\/strong> \u2014 just like we\u2019d do in a live environment.<\/p>\n\n\n\nWhat Does ORA-00059 Mean?<\/h2>\n\n\n\n
Oracle uses a parameter called DB_FILES<\/code> to define the maximum number of datafiles<\/strong> allowed in a database. When this limit is hit \u2014 typically during tablespace expansion \u2014 you\u2019ll get the ORA-00059<\/code> error.<\/p>\n\n\n\nQuick Definition:<\/h3>\n\n\n\n\nDB_FILES<\/code><\/strong>: An initialization parameter that sets the upper limit of datafiles Oracle can handle.<\/li>\n\n\n\n- Default value<\/strong>: Often around 200.<\/li>\n\n\n\n
- Type<\/strong>: Static (requires DB restart to change).<\/li>\n<\/ul>\n\n\n\n
When Does This Error Occur?<\/h2>\n\n\n\n
Let\u2019s say you run this:<\/p>\n\n\n\n
ALTER TABLESPACE users ADD DATAFILE '\/u01\/app\/oracle\/oradata\/users_10.dbf' SIZE 100M;<\/code><\/code><\/pre>\n\n\n\nAnd Oracle responds with:<\/p>\n\n\n\n
ORA-00059: maximum number of DB_FILES exceeded\n<\/code><\/code><\/pre>\n\n\n\nThis means you\u2019ve already added as many datafiles as your DB_FILES<\/code> setting allows.<\/p>\n\n\n\nHow to Check and Reproduce the Error<\/h2>\n\n\n\nStep 1: Check current file limit<\/h3>\n\n\n\nSHOW PARAMETER db_files;
<\/code><\/pre>\n\n\n\nSample output:<\/p>\n\n\n\n
NAME TYPE VALUE\n--------- -------- -----\ndb_files integer 200<\/code><\/code><\/pre>\n\n\n\nStep 2: Count your current datafiles<\/h3>\n\n\n\nSELECT COUNT(*) FROM v$datafile;\n<\/code><\/code><\/pre>\n\n\n\nIf the count is equal to or greater than<\/strong> the db_files<\/code> value, then you\u2019ve hit the cap.<\/p>\n\n\n\nHow to Fix ORA-00059 (Step-by-Step)<\/h2>\n\n\n\n
Since DB_FILES<\/code> is a static parameter<\/strong>, you’ll need to change it and restart the database.<\/p>\n\n\n\nIf your DB uses SPFILE (most production systems do):<\/h3>\n\n\n\n
Run this command:<\/p>\n\n\n\n
ALTER SYSTEM SET db_files = 500 SCOPE=SPFILE;\n<\/code><\/code><\/pre>\n\n\n\n\nTip: Pick a safe future-proof value. 500 or 1000 is a common choice for growing systems.<\/p>\n<\/blockquote>\n\n\n\n
If your DB uses PFILE (init.ora):<\/h3>\n\n\n\n
Manually edit the parameter file and set:<\/p>\n\n\n\n
db_files=500\n<\/code><\/code><\/pre>\n\n\n\nRestart the Database (Required)<\/h3>\n\n\n\n
Because DB_FILES<\/code> is static, the change only takes effect after a warm restart<\/strong>.<\/p>\n\n\n\nSHUTDOWN IMMEDIATE;\nSTARTUP;<\/code><\/code><\/pre>\n\n\n\nTest After Fixing<\/h2>\n\n\n\n
After the restart, recheck:<\/p>\n\n\n\n
SHOW PARAMETER db_files;\n<\/code><\/code><\/pre>\n\n\n\nNow re-run your original command:<\/p>\n\n\n\n
ALTER TABLESPACE users ADD DATAFILE '\/u01\/app\/oracle\/oradata\/users_10.dbf' SIZE 100M;\n<\/code><\/code><\/pre>\n\n\n\nIt should now work without errors.<\/p>\n\n\n\n
\ud83d\udca1 Pro Tips (Optional but Useful)<\/h2>\n\n\n\n\n- List all current datafiles: sqlCopyEdit
SELECT file_name FROM dba_data_files ORDER BY tablespace_name;<\/code><\/li>\n\n\n\n- To reduce the number of datafiles needed, consider using BIGFILE tablespaces<\/strong>: sqlCopyEdit
CREATE BIGFILE TABLESPACE big_ts DATAFILE '\/u01\/oracle\/big_ts01.dbf' SIZE 10G AUTOEXTEND ON;<\/code><\/li>\n\n\n\n- Always plan for some buffer in your
db_files<\/code> value \u2014 especially on partition-heavy or fast-growing databases.<\/li>\n<\/ul>\n\n\n\nSummary<\/h2>\n\n\n\nTask<\/th> Command<\/th><\/tr><\/thead> Check limit<\/td> SHOW PARAMETER db_files;<\/code><\/td><\/tr>Count datafiles<\/td> SELECT COUNT(*) FROM v$datafile;<\/code><\/td><\/tr>Increase limit<\/td> ALTER SYSTEM SET db_files = 500 SCOPE=SPFILE;<\/code><\/td><\/tr>Restart DB<\/td> SHUTDOWN IMMEDIATE; STARTUP;<\/code><\/td><\/tr>Retry datafile add<\/td> ALTER TABLESPACE ... ADD DATAFILE ...;<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\nThat’s it! This fix is quick and permanent once applied. Make sure to monitor growth so you don’t hit this silently again.<\/p>\n","protected":false},"excerpt":{"rendered":"
If you’re working with Oracle databases and hit this error: Don\u2019t worry \u2014 this just means your database has reached its configured limit for how many datafiles it can manage. This guide will show you why it happens, how to reproduce it, and how to fix it step-by-step \u2014 just like we\u2019d do in a […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"googlesitekit_rrm_CAowu461DA:productID":"","footnotes":""},"categories":[1225],"tags":[],"class_list":["post-4547","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/w3buddy.com\/blog\/wp-json\/wp\/v2\/posts\/4547","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/w3buddy.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/w3buddy.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/w3buddy.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/w3buddy.com\/blog\/wp-json\/wp\/v2\/comments?post=4547"}],"version-history":[{"count":1,"href":"https:\/\/w3buddy.com\/blog\/wp-json\/wp\/v2\/posts\/4547\/revisions"}],"predecessor-version":[{"id":4548,"href":"https:\/\/w3buddy.com\/blog\/wp-json\/wp\/v2\/posts\/4547\/revisions\/4548"}],"wp:attachment":[{"href":"https:\/\/w3buddy.com\/blog\/wp-json\/wp\/v2\/media?parent=4547"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/w3buddy.com\/blog\/wp-json\/wp\/v2\/categories?post=4547"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/w3buddy.com\/blog\/wp-json\/wp\/v2\/tags?post=4547"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}