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updated blocker-tree.sql
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@jkstill
jkstill committed Aug 12, 2024
1 parent a700edc commit 6ff786c
Showing 1 changed file with 150 additions and 58 deletions.
208 changes: 150 additions & 58 deletions sql/blocker-tree.sql
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Original file line number Diff line number Diff line change
@@ -1,83 +1,175 @@


-- blocker-tree.sql
-- Jared Still [email protected]
-- show tree of blocked sessions and blockers
--

/*

Examples:

@blocker-tree

SID USERNAME PROGRAM LEVEL
-------------------- ------------------------------ -------------------------------------------------- ----------
15 LGWR [email protected] (LGWR) 1
68 JKSTILL [email protected] (TNS V1-V3) 2
293 JKSTILL [email protected] (TNS V1-V3) 2
309 JKSTILL [email protected] (TNS V1-V3) 2
49 JKSTILL [email protected] (TNS V1-V3) 1
71 JKSTILL [email protected] (TNS V1-V3) 2

6 rows selected.


@blocker-tree

SID USERNAME PROGRAM
-------------------- ------------------------------ --------------------------------------------------
15 LGWR [email protected] (LGWR)
56 JKSTILL [email protected] (TNS V1-V3)
62 JKSTILL [email protected] (TNS V1-V3)
73 JKSTILL [email protected] (TNS V1-V3)
324 JKSTILL [email protected] (TNS V1-V3)
253 CKPT [email protected] (CKPT)
254 SMON [email protected] (SMON)
58 JKSTILL [email protected] (TNS V1-V3)
-- Jared Still 2021-08-04
-- Purpose: Find blocking chains in Oracle database
-- and display them in a tree format
-- updated the SQL used to define blockers and blocked sessions
-- added in lock_path, connect_by_root(sid) and sys_connect_by_path(sid,'/') to show the path of the blocking chain

set verify off

@get_date_range

/*

@blocker-tree '2024-08-04 22:00:00' '2024-08-05 02:00:00'

SID USERNAME STATUS PROGRAM LOCK_PATH
-------------------- -------------------- -------- -------------------------------------------------- --------------------------------------------------
483 SCOTT Blocker [email protected] (TNS V1-V3) /483
1146 SCOTT Blocked [email protected] (TNS V1-V3) /483/1146
1555 SCOTT Blocked [email protected] (TNS V1-V3) /483/1146/1555
1926 SCOTT Blocked [email protected] (TNS V1-V3) /483/1146/1555/1926
1926 SCOTT Blocked [email protected] (TNS V1-V3) /483/1146/1926
1555 SCOTT Blocked [email protected] (TNS V1-V3) /483/1146/1926/1555
1555 SCOTT Blocked [email protected] (TNS V1-V3) /483/1555
1146 SCOTT Blocked [email protected] (TNS V1-V3) /483/1555/1146
1926 SCOTT Blocked [email protected] (TNS V1-V3) /483/1555/1146/1926
1926 SCOTT Blocked [email protected] (TNS V1-V3) /483/1555/1926
1146 SCOTT Blocked [email protected] (TNS V1-V3) /483/1555/1926/1146
1921 SCOTT Blocked [email protected] (TNS V1-V3) /483/1921
859 SCOTT Blocked [email protected] (TNS V1-V3) /483/1921/859
955 SCOTT Blocked [email protected] (TNS V1-V3) /483/1921/859/955
1144 SCOTT Blocked [email protected] (TNS V1-V3) /483/1921/859/955/1144
1144 SCOTT Blocked [email protected] (TNS V1-V3) /483/1921/859/1144
955 SCOTT Blocked [email protected] (TNS V1-V3) /483/1921/859/1144/955
955 SCOTT Blocked [email protected] (TNS V1-V3) /483/1921/955
859 SCOTT Blocked [email protected] (TNS V1-V3) /483/1921/955/859
1144 SCOTT Blocked [email protected] (TNS V1-V3) /483/1921/955/859/1144
1144 SCOTT Blocked [email protected] (TNS V1-V3) /483/1921/955/1144
859 SCOTT Blocked [email protected] (TNS V1-V3) /483/1921/955/1144/859
1144 SCOTT Blocked [email protected] (TNS V1-V3) /483/1921/1144
859 SCOTT Blocked [email protected] (TNS V1-V3) /483/1921/1144/859
955 SCOTT Blocked [email protected] (TNS V1-V3) /483/1921/1144/859/955
955 SCOTT Blocked [email protected] (TNS V1-V3) /483/1921/1144/955
859 SCOTT Blocked [email protected] (TNS V1-V3) /483/1921/1144/955/859
1926 SCOTT Blocked [email protected] (TNS V1-V3) /483/1921/1926
1146 SCOTT Blocked [email protected] (TNS V1-V3) /483/1921/1926/1146
1555 SCOTT Blocked [email protected] (TNS V1-V3) /483/1921/1926/1146/1555
1555 SCOTT Blocked [email protected] (TNS V1-V3) /483/1921/1926/1555
1146 SCOTT Blocked [email protected] (TNS V1-V3) /483/1921/1926/1555/1146
1926 SCOTT Blocked [email protected] (TNS V1-V3) /483/1926
1146 SCOTT Blocked [email protected] (TNS V1-V3) /483/1926/1146
1555 SCOTT Blocked [email protected] (TNS V1-V3) /483/1926/1146/1555
1555 SCOTT Blocked [email protected] (TNS V1-V3) /483/1926/1555
1146 SCOTT Blocked [email protected] (TNS V1-V3) /483/1926/1555/1146
859 SCOTT Blocker [email protected] (TNS V1-V3) /859


*/


set linesize 150 trimspool on
set pagesize 100
--def v_event_filter='enq: TX - row lock contention'
--def v_event_filter='enq: %'
def v_event_filter='%'

col sid format a20
col sid format a30
col username format a30
col status format a8
col program format a50
col lock_path format a50
col event format a40

with blockers as (
set linesize 300 trimspool on

set pagesize 500

spool blocker-tree.log

with blocked as (
select distinct
h.session_id sid
, h.blocking_session blocking_sid
, h.program
, u.username
, h.event
from dba_hist_active_sess_history h
join dba_hist_snapshot s on s.snap_id = h.snap_id
and s.instance_number = h.instance_number
and s.dbid = h.dbid
join dba_users u on u.user_id = h.user_id
where h.blocking_session is not null
and s.begin_interval_time between to_date('&&d_begin_date','&&d_date_format') and to_date('&&d_end_date','&&d_date_format')
and h.event like '&v_event_filter'
),
blocked_match as (
select distinct
s.sid, null blocking_sid, nvl(s.username,b.name) username, s.program
from v$session s
join v$process p on p.addr = s.paddr
left outer join v$bgprocess b on b.paddr = s.paddr
where s.sid in (select blocking_session from v$session)
and blocking_session is null
h.instance_number
, h.dbid
, h.session_id sid
, h.blocking_session blocking_sid
, h.blocking_session_serial#
, h.snap_id
, h.sample_id
, h.time_waited
, h.program
, u.username
from dba_hist_active_sess_history h
join dba_hist_snapshot s on s.snap_id = h.snap_id
and s.instance_number = h.instance_number
and s.dbid = h.dbid
join dba_users u on u.user_id = h.user_id
where h.blocking_session is not null
and s.begin_interval_time between to_date('&&d_begin_date','&&d_date_format') and to_date('&&d_end_date','&&d_date_format')
and h.event like '&v_event_filter'
),
blocked as (
select s.sid, s.blocking_session blocking_sid, nvl(s.username,b.name) username, s.program
from v$session s
join v$process p on p.addr = s.paddr
left outer join v$bgprocess b on b.paddr = s.paddr
where blocking_session is not null
blockers as (
select distinct
u.username
, blkr.session_id sid
, null blocking_sid
, blkr.program
, blkr.event
--, blkr.time_waited
from blocked_match b
join dba_hist_active_sess_history blkr
on b.snap_id = blkr.snap_id
and b.dbid = blkr.dbid
and b.instance_number = blkr.instance_number
and b.sample_id = blkr.sample_id
and b.blocking_sid = blkr.session_id
and b.blocking_session_serial# = blkr.session_serial#
--and blkr.blocking_session is null
join dba_users u on u.user_id = blkr.user_id
),
all_data as (
select sid, blocking_sid, username, program
select username, sid, blocking_sid, 'Blocker' status, program, event
from blockers
union all
select sid, blocking_sid, username, program
select username, sid, blocking_sid, 'Blocked' status, program, event
from blocked
),
rpt as (
select
lpad(' ',(level)*2,' ') || sid sid
, username
, status
, program
, event
, level lock_depth
, connect_by_isleaf isleaf
, connect_by_root(sid) sid_root
, sys_connect_by_path(sid,'/') lock_path
from all_data
connect by nocycle blocking_sid = prior sid
start with blocking_sid is null
)
select
lpad(' ',(level)*2,' ') || sid sid
sid
, username
, status
, program
--, level
from all_data
connect by blocking_sid = prior sid
start with blocking_sid is null
, event
--, lock_depth
--, isleaf
, sid_root
, lock_path
from rpt
--where sid_root = sid -- blockers only
/

spool off

ed blocker-tree.log


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