{"id":18164,"date":"2022-07-30T11:42:57","date_gmt":"2022-07-30T09:42:57","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/?p=18164"},"modified":"2022-07-30T11:42:58","modified_gmt":"2022-07-30T09:42:58","slug":"a-few-words-about-the-good-to-know-max_idle_blocker_time","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/a-few-words-about-the-good-to-know-max_idle_blocker_time\/","title":{"rendered":"A few words about the good to know MAX_IDLE_BLOCKER_TIME"},"content":{"rendered":"\n<p>The increasing popularity of tools like SQL Developer and Toad, sometimes comes hand in hand with an increase of stuck sessions.<br>This is especially seen in cases where:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>User A does a change (neither committed nor rolled back). Then, switches to another task, or even leaves for lunch.<\/li><li>Then, User B updates the same row and stays there, stuck for hours.<\/li><\/ul>\n\n\n\n<p>In such cases, DBAs can obviously kill the initial blocker session.<br>In the past, Resource Manager could be setup to fix these automatically. According the <a href=\"https:\/\/docs.oracle.com\/database\/121\/ARPLS\/d_resmgr.htm#ARPLS67609\">Oracle 12.1 manual<\/a>, the procedure DBMS_RESOURCE_MANAGER.CREATE_PLAN_DIRECTIVE() has the 2 below parameters<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>max_idle_time<\/td><td>Indicates the maximum session idle time. Default is&nbsp;NULL, which means unlimited.<\/td><\/tr><tr><td>max_idle_blocker_time<\/td><td>Maximum amount of time in seconds that a session can be idle while blocking another session&#8217;s acquisition of a resource<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Nowadays, in 21c (checked in 21.6.0.0.220419), we can achieve the same by setting only 1 init.ora\/spfile parameter.<br>Actually, although often marked as 21c New Feature, this already works in 19c (checked in 19.10.0.0.210119)<\/p>\n\n\n\n<p>Let&#8217;s have a closer look at this &#8220;good to know&#8221; parameter.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>What&#8217;s on by default?<\/strong><\/h2>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<pre class=\"wp-block-preformatted\">SQL&gt; show parameter idle\nNAME\t\t\t\t     TYPE\t VALUE\n------------------------------------ ----------- --------------------\nmax_idle_blocker_time\t\t     integer\t 0\nmax_idle_time\t\t\t     integer\t 0<\/pre>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<p>By default, both parameters are set to 0, meaning there is no limit set.<\/p>\n\n\n\n<p>According <a href=\"https:\/\/docs.oracle.com\/en\/database\/oracle\/oracle-database\/19\/refrn\/MAX_IDLE_BLOCKER_TIME.html\">Oracle 19c documentation<\/a>, we can set MAX_IDLE_BLOCKER_TIME to a number of minutes that a session holding needed resources can be idle before it is automatically terminated.<\/p>\n\n\n\n<p>So, shall we set MAX_IDLE_TIME or MAX_IDLE_BLOCKER_TIME?<br>By giving a value to MAX_IDLE_TIME, we limit all idle sessions<br>whereas by setting MAX_IDLE_BLOCKER_TIME, we only limit idle sessions blocking resources.<\/p>\n\n\n\n<p>Setting MAX_IDLE_TIME can be be an issue in case of connection pool.<br>In such a case, we could continuously re-create sessions automatically terminated by this parameter.<\/p>\n\n\n\n<p><\/p>\n<\/div><\/div>\n<\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Set MAX_IDL<\/strong>E_BLOCKER_TIME value to 5 minutes<\/h2>\n\n\n\n<pre class=\"wp-block-preformatted\">alter system set max_idle_blocker_time=5;<\/pre>\n\n\n\n<p>This parameter is modifiable at PDB-level.<\/p>\n\n\n\n<p>While connected to CDB$ROOT, we can easily doublecheck the change by selecting against the pdb_spfile$ system view:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">select ps.db_uniq_name, ps.pdb_uid, p.name as pdb_name, ps.name, ps.value$\nfrom pdb_spfile$ ps\n join v$pdbs p on ps.pdb_uid = p.con_uid\n order by 1, 2, 3;\n \n DB_UNIQ_NA    PDB_UID PDB_NAME\t\t   NAME \t\t     VALUE$\n---------- ---------- -------------------- ------------------------- ----------\n*\t   3067207640 PDB1T\t\t   max_idle_blocker_time     5\n\n\n<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>In a 1st session, let&#8217;s now update the table (without commit nor rollback)<\/strong><\/h2>\n\n\n\n<pre class=\"wp-block-preformatted\">SQL&gt; select * from products;\n\n\tID NAME\n---------- ----------------------------------------\n\t 1 bread\n\t 2 chocolate\n\nSQL&gt; show auto\nautocommit OFF\n\nSQL&gt; set time on\n11:08:42 SQL&gt; update products set name='cheese' where id=2;\n\n1 row updated.\n<\/pre>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<p>Here, let&#8217;s now leave as is (without commit nor rollback)<\/p>\n<\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>In a 2nd session, Update the same row will hang<\/strong><\/h2>\n\n\n\n<pre class=\"wp-block-preformatted\">show auto\nautocommit OFF\nset time on\n\nSQL&gt; update products set name='bier' where id=2;\n<\/pre>\n\n\n\n<p>&#8230; Wait &#8230;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Optionally, in a 3rd session, show locks<\/strong><\/h2>\n\n\n\n<pre class=\"wp-block-preformatted\">SQL&gt; set time on\n11:10:02 SQL&gt; @qinalocksess.sql\n\n    SID Lock Type\t\t       Lock Mode\t\t\t\tRequest Block Owner\t\t\t       Table Name\t\t\t Wait s.\n------- ------------------------------ ---------------------------------------- ------- ----- -------------------------------- -------------------------------- --------\n    105 DML Lock (TM)\t\t       ROW-X (SX)\t\t\t\t      0     0 USER1\t\t\t       PRODUCTS \t\t\t      75\n     67 DML Lock (TM)\t\t       ROW-X (SX)\t\t\t\t      0     0 USER1\t\t\t       PRODUCTS \t\t\t      35\n\n2 rows selected.\n\n...\/...\n\n11:12:33 SQL&gt; @qinalocksess.sql\n\n    SID Lock Type\t\t       Lock Mode\t\t\t\tRequest Block Owner\t\t\t       Table Name\t\t\t Wait s.\n------- ------------------------------ ---------------------------------------- ------- ----- -------------------------------- -------------------------------- --------\n    105 DML Lock (TM)\t\t       ROW-X (SX)\t\t\t\t      0     0 USER1\t\t\t       PRODUCTS \t\t\t     230\n     67 DML Lock (TM)\t\t       ROW-X (SX)\t\t\t\t      0     0 USER1\t\t\t       PRODUCTS \t\t\t     190\n\n2 rows selected.\n11:14:35 SQL&gt; @qinalocksess.sql\n\nThu Jul 28\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t page\t 1\n\t\t\t\t\t\t\t\t\t\t\t\t\t Sessions Blocking Other Sessions Report\n\n    SID Lock Type\t\t       Lock Mode\t\t\t\tRequest Block Owner\t\t\t       Table Name\t\t\t Wait s.\n------- ------------------------------ ---------------------------------------- ------- ----- -------------------------------- -------------------------------- --------\n     67 DML Lock (TM)\t\t       ROW-X (SX)\t\t\t\t      0     0 USER1\t\t\t       PRODUCTS \t\t\t      48\n\n1 row selected.\n<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Let&#8217;s now go back to session 1<\/strong><\/h2>\n\n\n\n<p>After the 5 minutes, we can verify the 1st session has been automatically terminated with an ORA-03113.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">11:08:52 SQL&gt; \/\nupdate products set name='cheese' where id=2\n       *\nERROR at line 1:\nORA-03113: end-of-file on communication channel\nProcess ID: 6451\nSession ID: 105 Serial number: 36338\n<\/pre>\n\n\n\n<p>Usually, seeing ORA-03113 is not expected as this often reveals some kind of oracle bugs (ORA-00600 or ORA-07445).<br>In the present case, it is nice to see such error.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>The Update from Session 2 is now completed as the initial row-level lock has gone<\/strong><\/h2>\n\n\n\n<pre class=\"wp-block-preformatted\">SQL&gt; set time on\n11:09:21 SQL&gt; update products set name='bier' where id=2;\n\n1 row updated.\n\n11:13:58 SQL&gt; commit;\n\nCommit complete.\n\n11:16:25 SQL&gt;\n<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Look at the leftovers logs and tracefiles<\/strong><\/h2>\n\n\n\n<pre class=\"wp-block-preformatted\">adrci\nadrci&gt; set homepath diag\/rdbms\/cdb1t_site1\/CDB1T\nadrci&gt; show alert -tail<\/pre>\n\n\n\n<p>The automatic session closure is written black on white in the Alert log:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">2022-07-28 11:13:58.032000 +02:00\nKILL SESSION for sid=(105, 36338):\n  Reason = max_idle_blocker_time parameter, idle time = 5 mins, currently waiting on 'SQL*Net message from\n  Mode = KILL HARD SAFE -\/-\/NO_REPLAY\n  Requestor = PMON (orapid = 2, ospid = 2187, inst = 1)\n  Owner = Process: USER (orapid = 64, ospid = 6451)\n  User = oracle\n  Program = sqlplus@l8-bsl.localdomain (TNS V1-V3)\n  Result = ORA-0\n  <\/pre>\n\n\n\n<p>If need be, we can get more details by looking at the trace files generated by the Diag background process:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">oracle@l8-bsl:\/u01\/app\/oracle\/diag\/rdbms\/cdb1t_site1\/CDB1T\/trace\/ [CDB1T(PDB1T)] ls -ltr\n...\n-rw-r-----. 1 oracle oinstall   37932 Jul 28 11:19 CDB1T_dia0_2241_base_1.trc\n<\/pre>\n\n\n\n<pre class=\"wp-block-preformatted\">cat CDB1T_dia0_2241_base_1.trc\n.....\n*** 2022-07-28T11:10:28.504611+02:00 (CDB$ROOT(1))\nHM: Session with ID 105 serial # 36338 (FG)\n    on single instance 1 in container PDB1T is hung\n    and is waiting on 'SQL*Net message from client' for 96 seconds.\n    Session was previously waiting on 'SQL*Net message to client'.\n    Session ID 105 is blocking 1 session\n.....\n*** 2022-07-28T11:11:09.462853+02:00 (CDB$ROOT(1))\nHM: Session with ID 67 serial # 14207 (FG)\n    on single instance 1 in container PDB1T is hung\n    and is waiting on 'enq: TX - row lock contention' for 97 seconds.\n    Session was previously waiting on 'PGA memory operation'.\n    Final Blocker is Session ID 105 serial# 36338 on instance 1\n     which is waiting on 'SQL*Net message from client' for 135 seconds, wait id 48\n     p1: 'driver id'=0x54435000, p2: '#bytes'=0x1, p3: ''=0x0\n.....\n*** 2022-07-28T11:11:11.513636+02:00 (CDB$ROOT(1))\nAll Current Hang Statistics\n\n                      current number of hangs 1\n    hangs:current number of impacted sessions 2\n                  current number of deadlocks 0\ndeadlocks:current number of impacted sessions 0\n           number of locally blocked sessions 1\n  local contention - locally blocked sessions 33.33%\n          number of remotely blocked sessions 0\nremote contention - remotely blocked sessions  0.00%\n                 current number of singletons 0\n      current number of local active sessions 3\n        current number of local hung sessions 1\n\nSuspected Hangs in the System\nand possibly Rebuilt Hangs\n                     Root       Chain Total               Hang\n  Hang Hang          Inst Root  #hung #hung  Hang   Hang  Resolution\n    ID Type Status   Num  Sess   Sess  Sess  Conf   Span  Action\n ----- ---- -------- ---- ----- ----- ----- ------ ------ -------------------\n     2 HANG    VALID    1   105     2     2    LOW  LOCAL Terminate Process\n\n  Inst  Sess   Ser             Proc  Wait    Wait\n   Num    ID    Num      OSPID  Name Time(s) Event\n  ----- ------ ----- --------- ----- ------- -----\n        PDBID PDBNm\n        ----- ---------------\n      1     67 14207      6691    FG      99 enq: TX - row lock contention\n            3 PDB1T\n      1    105 36338      6451    FG     139 SQL*Net message from client\n            3 PDB1T\n.....\nHM: current SQL: update products set name='bier' where id=2\n\n\n                                                     IO\n Total  Self-         Total  Total  Outlr  Outlr  Outlr\n  Hung  Rslvd  Rslvd   Wait WaitTm   Wait WaitTm   Wait\n  Sess  Hangs  Hangs  Count   Secs  Count   Secs  Count Wait Event\n------ ------ ------ ------ ------ ------ ------ ------ -----------\n     2      0      0      1    192      1    192      0 enq: TX - row lock contention\n\n <\/pre>\n","protected":false},"excerpt":{"rendered":"<p>The increasing popularity of tools like SQL Developer and Toad, sometimes comes hand in hand with an increase of stuck sessions.This is especially seen in cases where: User A does a change (neither committed nor rolled back). Then, switches to another task, or even leaves for lunch. Then, User B updates the same row and [&hellip;]<\/p>\n","protected":false},"author":27,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[229,198,59],"tags":[2630,2631,2639,481,2640,2632],"type_dbi":[],"class_list":["post-18164","post","type-post","status-publish","format-standard","hentry","category-database-administration-monitoring","category-database-management","category-oracle","tag-19c-2","tag-21c-2","tag-idle","tag-lock","tag-max_idle_blocker_time","tag-ora-03113"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>A few words about the good to know MAX_IDLE_BLOCKER_TIME - dbi Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dbi-services.com\/blog\/a-few-words-about-the-good-to-know-max_idle_blocker_time\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"A few words about the good to know MAX_IDLE_BLOCKER_TIME\" \/>\n<meta property=\"og:description\" content=\"The increasing popularity of tools like SQL Developer and Toad, sometimes comes hand in hand with an increase of stuck sessions.This is especially seen in cases where: User A does a change (neither committed nor rolled back). 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Then, User B updates the same row and [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.dbi-services.com\/blog\/a-few-words-about-the-good-to-know-max_idle_blocker_time\/\" \/>\n<meta property=\"og:site_name\" content=\"dbi Blog\" \/>\n<meta property=\"article:published_time\" content=\"2022-07-30T09:42:57+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-07-30T09:42:58+00:00\" \/>\n<meta name=\"author\" content=\"Oracle Team\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Oracle Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/a-few-words-about-the-good-to-know-max_idle_blocker_time\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/a-few-words-about-the-good-to-know-max_idle_blocker_time\\\/\"},\"author\":{\"name\":\"Oracle Team\",\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/#\\\/schema\\\/person\\\/66ab87129f2d357f09971bc7936a77ee\"},\"headline\":\"A few words about the good to know MAX_IDLE_BLOCKER_TIME\",\"datePublished\":\"2022-07-30T09:42:57+00:00\",\"dateModified\":\"2022-07-30T09:42:58+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/a-few-words-about-the-good-to-know-max_idle_blocker_time\\\/\"},\"wordCount\":493,\"commentCount\":0,\"keywords\":[\"19c\",\"21c\",\"idle\",\"lock\",\"MAX_IDLE_BLOCKER_TIME\",\"ORA-03113\"],\"articleSection\":[\"Database Administration &amp; 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