{"id":55543,"date":"2024-01-12T20:00:11","date_gmt":"2024-01-12T20:00:11","guid":{"rendered":"https:\/\/dbtut.com\/?p=55543"},"modified":"2024-01-12T20:00:11","modified_gmt":"2024-01-12T20:00:11","slug":"oracle-undo-management","status":"publish","type":"post","link":"https:\/\/dbtut.com\/index.php\/2024\/01\/12\/oracle-undo-management\/","title":{"rendered":"Oracle Undo Management"},"content":{"rendered":"

In this article, I will try to explain how undo is managed, the purpose of undo tablespace, its place in daily use and its sizing.<\/p>\n

Oracle recommends that Undo management be AUTO.<\/p>\n

SQL> show parameter undo_management\r\n\t\t\r\nNAME                                 TYPE        VALUE\r\n------------------------------------ ----------- ------------------------------\r\nundo_management                      string      AUTO<\/pre>\n
The parameter that determines whether Undo will be kept minimum is UNDO_RETENTION.<\/p>\n
If AUTOEXTEND is set to ON, it will be auto-tune.<\/p>\n
Therefore, it makes setting the parameter somewhat unnecessary.<\/p>\n
Therefore, the most important criterion is to set Undo Tablespace to the correct size.<\/p>\n
SQL> show parameter undo_retention\r\n\t\t\r\nNAME                                 TYPE        VALUE\r\n------------------------------------ ----------- ------------------------------\r\nundo_retention                       integer     900\r\n\t\t\r\nSQL> select min(tuned_undoretention), max(tuned_undoretention), round(avg(tuned_undoretention))  from v$undostat;\r\n\t\t\r\nMIN(TUNED_UNDORETENTION) MAX(TUNED_UNDORETENTION) ROUND(AVG(TUNED_UNDORETENTION))\r\n------------------------ ------------------------ -------------------------------\r\n1016                     3941                            2154\r\n<\/pre>\n
The UNDO ADVISOR package is used to set the size of Undo correctly. How to use the package is as follows.<\/p>\n
1. Learning the duration of the longest running query.<\/p>\n
i. In the last 7 days,<\/p>\n
SQL> SELECT dbms_undo_adv.longest_query LONGEST_QUERY FROM dual;\r\n\t\t\t\r\nLONGEST_QUERY\r\n-------------\r\n3040\r\n<\/pre>\n
ii. After a certain date,<\/p>\n
SQL> SELECT dbms_undo_adv.longest_query(SYSDATE-1\/24, SYSDATE) LONGEST_QUERY FROM dual;\r\n\t\t\t\r\nLONGEST_QUERY\r\n-------------\r\n1938\r\n<\/pre>\n
iii. Among certain AWR reports,<\/p>\n
SQL> SELECT dbms_undo_adv.longest_query(21146, 21147) LONGEST_QUERY FROM dual;\r\n\t\t\t\r\nLONGEST_QUERY\r\n-------------\r\n3040\r\n<\/pre>\n
It can also be learned from v$session_longops. In this view, all transactions that take longer than 6 seconds can be seen.<\/p>\n
2. Learning the longest running query.<\/p>\n
i. If it is not too old;<\/p>\n
SQL> select maxqueryid, maxquerylen from v$undostat where maxquerylen in (select max(maxquerylen) from v$undostat);\r\n\t\t\t\t\r\nMAXQUERYID    MAXQUERYLEN\r\n------------- -----------\r\n89w8y2pgn25yd        3040\r\n<\/pre>\n
ii. If it is very old, it can be found in the dictionary.<\/p>\n
SQL> select maxquerysqlid, maxquerylen from dba_hist_undostat where maxquerylen in (select max(maxquerylen) from dba_hist_undostat);\r\n\t\t\t\t\r\nMAXQUERYSQLID MAXQUERYLEN\r\n------------- -----------\r\n1nrby9brx4vvt        3271\r\n<\/pre>\n
3. Learning the required RETENTION time according to the longest running query.<\/p>\n
i. In the last 7 days,<\/p>\n
SQL> select dbms_undo_adv.required_retention from dual;\r\n\t\t\t\t\r\nREQUIRED_RETENTION\r\n------------------\r\n3040\r\n<\/pre>\n
ii. Between a certain date,<\/p>\n
SQL> SELECT dbms_undo_adv.required_retention(SYSDATE-1\/24, SYSDATE) required_retention FROM dual;\r\n\t\t\t\t\r\nREQUIRED_RETENTION\r\n------------------\r\n1698\r\n<\/pre>\n
iii. Among certain AWRs,<\/p>\n
SQL> SELECT dbms_undo_adv.required_retention(21046, 21047) required_retention FROM dual;\r\n\t\t\t\t\r\nREQUIRED_RETENTION\r\n------------------\r\n1671\r\n<\/pre>\n
4. Best possible retention period is learned.<\/p>\n
i. In the last 7 days,<\/p>\n
SQL> SELECT dbms_undo_adv.best_possible_retention best_retention FROM dual;\r\n\t\t\t\t\r\nBEST_RETENTION\r\n--------------\r\n119478\r\n<\/pre>\n
ii. Between certain dates,<\/p>\n
SQL> SELECT dbms_undo_adv.best_possible_retention(SYSDATE-1\/24, SYSDATE) best_retention FROM dual;\r\n\t\t\t\t\r\nBEST_RETENTION\r\n--------------\r\n150919<\/pre>\n
iii. Among certain AWRs,<\/p>\n
SQL> SELECT dbms_undo_adv.best_possible_retention(21046, 21047) best_retention FROM dual; \r\n\t\t\t\t\r\nBEST_RETENTION\r\n--------------\r\n177348\r\n<\/pre>\n
5. The required Undo Size is learned according to Best possible retention. (MB)<\/p>\n
SQL> SELECT dbms_undo_adv.required_undo_size(119478) required_undo_size FROM dual;\r\n\t\t\t\r\nREQUIRED_UNDO_SIZE\r\n------------------\r\n32606\r\n<\/pre>\n
UNDO ADVISOR can also be viewed through OEM. It will give the same results as the values returned as a result of the query.<\/p>\n
Home -> Instances -> Server -> Database Configuration -> Automatic Undo Management\r\n<\/pre>\n
\"\"<\/p>\n
If Show Graph is opened;<\/p>\n
\"\"<\/p>\n
In the System Activity tab;<\/p>\n
\"\"<\/p>\n
\"\"<\/p>\n
<\/div>\n
<\/path><\/svg><\/i> \"Loading\"<\/p>\n
<\/div>\n","protected":false},"excerpt":{"rendered":"
In this article, I will try to explain how undo is managed, the purpose of undo tablespace, its place in daily use and its sizing. Oracle recommends that Undo management be AUTO. SQL> show parameter undo_management NAME TYPE VALUE ———————————— ———– —————————— undo_management string AUTO The parameter that determines whether Undo will be kept minimum …<\/p>\n
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<\/div>\n","protected":false},"author":484,"featured_media":55548,"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,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-55543","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-oracle"],"aioseo_notices":[],"yoast_head":"\nOracle Undo Management - Database Tutorials<\/title>\n<meta name=\"description\" content=\"In this article, I will try to explain how undo is managed, the purpose of undo tablespace, its place in daily use and its sizing.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/dbtut.com\/index.php\/2024\/01\/12\/oracle-undo-management\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Oracle Undo Management - 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