----------------------------------------------------------------------------------------

--

-- File name: cs_blocked_sessions_ash_awr_pie.sql

--

-- Purpose: Top Session Blockers as per ASH from AWR (summary pie chart)

--

-- Author: Carlos Sierra

--

-- Version: 2020/12/06

--

-- Usage: Execute connected to CDB or PDB

--

-- Enter range of dates and filters when requested.

--

-- Example: $ sqlplus / as sysdba

-- SQL> @cs_blocked_sessions_ash_awr_pie.sql

--

-- Notes: Developed and tested on 12.1.0.2.

--

---------------------------------------------------------------------------------------

--

@@cs_internal/cs_primary.sql

@@cs_internal/cs_set.sql

@@cs_internal/cs_def.sql

@@cs_internal/cs_file_prefix.sql

--

DEF cs_script_name = 'cs_blocked_sessions_ash_awr_pie';

DEF cs_hours_range_default = '24';

--

@@cs_internal/cs_sample_time_from_and_to.sql

@@cs_internal/cs_snap_id_from_and_to.sql

--

--ALTER SESSION SET container = CDB$ROOT;

--

SELECT '&&cs_file_prefix._&&cs_script_name.' cs_file_name FROM DUAL;

--

DEF report_title = 'Root Blocker Status and its contribution to Blocked Sessions between &&cs_sample_time_from. and &&cs_sample_time_to. UTC';

DEF chart_title = '&&report_title.';

DEF xaxis_title = '';

DEF vaxis_title = '';

--

-- (isStacked is true and baseline is null) or (not isStacked and baseline >= 0)

DEF is_stacked = "isStacked: false,";

--DEF is_stacked = "isStacked: true,";

--DEF vaxis_baseline = ", baseline:&&cs_num_cpu_cores., baselineColor:'red'";

DEF vaxis_baseline = "";

DEF chart_foot_note_2 = '<br>2) ROOT BLOCKER SESSION STATUS "INACTIVE" means: Database is waiting for Application Host to release LOCK, while "UNKNOWN" could be a BACKGROUND session on CDB$ROOT.';

DEF chart_foot_note_3 = "<br>";

--DEF chart_foot_note_3 = "";

DEF chart_foot_note_4 = "";

DEF report_foot_note = 'SQL> @&&cs_script_name..sql "&&cs_sample_time_from." "&&cs_sample_time_to."';

--

DEF chart_foot_note_0 = '';

DEF chart_foot_note_1 = '';

-- [Line|Area|SteppedArea|Scatter]

DEF cs_chart_type = 'Pie';

DEF cs_chart_width = '900px';

DEF cs_chart_height = '450px';

DEF cs_chartarea_height = '80%';

-- disable explorer with "//" when using Pie

DEF cs_chart_option_explorer = '//';

-- enable pie options with "" when using Pie

DEF cs_chart_option_pie = '';

-- pieSliceText [{percentage}|value|label|none]

DEF cs_chart_pie_slice_text = "// pieSliceText: 'percentage',";

-- use oem colors

DEF cs_oem_colors_series = '//';

DEF cs_oem_colors_slices = '//';

-- for line charts

DEF cs_curve_type = '//';

--

@@cs_internal/cs_spool_head_chart.sql

--

PRO ,'VALUE'

PRO ]

--

SET HEA OFF PAGES 0;

/****************************************************************************************/

WITH

ash AS (

SELECT /*+ MATERIALIZE NO_MERGE */

h.sample_id,

h.sample_time,

h.machine,

h.session_id,

h.session_serial#,

h.blocking_session,

h.blocking_session_serial#,

h.session_state,

h.wait_class,

h.event,

h.sql_id,

h.top_level_sql_id

FROM dba_hist_active_sess_history h

WHERE h.sample_time >= TO_TIMESTAMP('&&cs_sample_time_from.', '&&cs_datetime_full_format.')

AND h.sample_time < TO_TIMESTAMP('&&cs_sample_time_to.', '&&cs_datetime_full_format.')

AND h.dbid = TO_NUMBER('&&cs_dbid.')

AND h.instance_number = TO_NUMBER('&&cs_instance_number.')

AND h.snap_id BETWEEN TO_NUMBER('&&cs_snap_id_from.') AND TO_NUMBER('&&cs_snap_id_to.')

),

inactive_sessions AS (

SELECT /*+ MATERIALIZE NO_MERGE */

DISTINCT

i.sample_id,

CAST(i.sample_time AS DATE) sample_time,

i.blocking_session session_id,

i.blocking_session_serial# session_serial#

FROM ash i

WHERE i.blocking_session IS NOT NULL

AND i.blocking_session_serial# IS NOT NULL

AND NOT EXISTS (

SELECT /*+ MATERIALIZE NO_MERGE */

NULL

FROM ash a

WHERE a.sample_id = i.sample_id

AND a.session_id = i.blocking_session

AND a.session_serial# = i.blocking_session_serial#

)),

all_sessions AS (

SELECT /*+ MATERIALIZE NO_MERGE */

a.sample_id, CAST(a.sample_time AS DATE) sample_time, a.machine, a.session_id, a.session_serial#, a.blocking_session, a.blocking_session_serial#,

'ACTIVE' status, session_state, wait_class, event, sql_id, top_level_sql_id

FROM ash a

UNION ALL

SELECT /*+ MATERIALIZE NO_MERGE */

i.sample_id, i.sample_time, NULL machine, i.session_id, i.session_serial#, TO_NUMBER(NULL), TO_NUMBER(NULL),

'INACTIVE or UNKNOWN' status, NULL session_state, NULL wait_class, NULL event, NULL sql_id, NULL top_level_sql_id

FROM inactive_sessions i

),

sess_history AS (

SELECT /*+ MATERIALIZE NO_MERGE */

sample_id, sample_time, machine, session_id, session_serial#, status, session_state, wait_class, event, sql_id, top_level_sql_id,

LEVEL lvl,

CONNECT_BY_ROOT machine blocker_machine,

CONNECT_BY_ROOT session_id blocker_session,

CONNECT_BY_ROOT session_serial# blocker_session_serial#,

CONNECT_BY_ISLEAF AS leaf

FROM all_sessions

START WITH blocking_session IS NULL AND blocking_session_serial# IS NULL

CONNECT BY sample_id = PRIOR sample_id AND blocking_session = PRIOR session_id AND blocking_session_serial# = PRIOR session_serial#

),

blockers AS (

SELECT /*+ MATERIALIZE NO_MERGE */

sample_id, sample_time, status, session_state, wait_class, event, sql_id, top_level_sql_id, session_id, session_serial#

FROM sess_history

WHERE lvl = 1

),

blockees AS (

SELECT /*+ MATERIALIZE NO_MERGE */

sample_id, sample_time, status, wait_class, event, blocker_session, blocker_session_serial#, COUNT(*) cnt

FROM sess_history

WHERE lvl > 1

GROUP BY

sample_id, sample_time, status, wait_class, event, blocker_session, blocker_session_serial#

),

machines AS (

SELECT /*+ MATERIALIZE NO_MERGE */

session_id, session_serial#, MAX(machine) machine

FROM sess_history

WHERE machine IS NOT NULL

GROUP BY

session_id, session_serial#

UNION

SELECT /*+ MATERIALIZE NO_MERGE */

sid session_id, serial# session_serial#, machine

FROM v$session

),

blockers_and_blockees AS (

SELECT /*+ MATERIALIZE NO_MERGE */

b.sample_id,

b.sample_time time,

a.wait_class||' - '||a.event AS wait_class_event,

b.status blocker_status,

b.session_state blocker_session_state,

b.wait_class blocker_wait_class,

b.event blocker_event,

COALESCE(b.sql_id, b.top_level_sql_id) AS blocker_sql_id,

NVL(m.machine, 'unknown') machine,

b.session_id blocker_session_id,

b.session_serial# blocker_session_serial#,

NVL(a.cnt, 0) sessions_blocked

FROM blockers b,

blockees a,

machines m

WHERE a.sample_id(+) = b.sample_id

AND a.sample_time(+) = b.sample_time

AND a.blocker_session(+) = b.session_id

AND a.blocker_session_serial#(+) = b.session_serial#

AND m.session_id(+) = b.session_id

AND m.session_serial#(+) = b.session_serial#

)

/****************************************************************************************/

,

detail AS (

SELECT /*+ MATERIALIZE NO_MERGE */

b.time,

b.sessions_blocked blocked,

b.blocker_session_id||','||b.blocker_session_serial# blocker,

b.machine blocker_machine,

CASE b.blocker_status WHEN 'INACTIVE or UNKNOWN' THEN (CASE b.machine WHEN '&&cs_host_name.' THEN 'UNKNOWN' ELSE 'INACTIVE' END) ELSE ('ACTIVE '||CASE b.blocker_session_state WHEN 'ON CPU' THEN b.blocker_session_state ELSE 'WAITING ON '||b.blocker_wait_class||' - '||b.blocker_event END) END blocker_status,

b.blocker_sql_id,

(SELECT s.sql_text FROM v$sql s WHERE s.sql_id = b.blocker_sql_id AND ROWNUM = 1) blocker_sql_text

FROM blockers_and_blockees b

WHERE b.sessions_blocked > 0

),

summary AS (

SELECT /*+ MATERIALIZE NO_MERGE */

blocker_status slice,

' ('||TRIM(TO_CHAR(100 * SUM(blocked) / SUM(SUM(blocked)) OVER (), '990.0'))||'%)' percent,

SUM(blocked) value

FROM detail

GROUP BY

blocker_status

)

SELECT ', ['''||slice||percent||''','||value||']'

FROM summary

ORDER BY

value DESC

/

/****************************************************************************************/

SET HEA ON PAGES 100;

--

@@cs_internal/cs_spool_id_chart.sql

@@cs_internal/cs_spool_tail_chart.sql

PRO

PRO &&report_foot_note.

--

--ALTER SESSION SET CONTAINER = &&cs_con_name.;

--

@@cs_internal/cs_undef.sql

@@cs_internal/cs_reset.sql

--