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

--

-- File name: cs_blocked_sessions_by_session_ash_mem_chart.sql

--

-- Purpose: Top Session Blockers by Root Session as per ASH from Memory (time series 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_by_session_ash_mem_chart.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_by_session_ash_mem_chart';

DEF cs_hours_range_default = '3';

--

@@cs_internal/cs_sample_time_from_and_to.sql

@@cs_internal/cs_snap_id_from_and_to.sql

--

--ALTER SESSION SET container = CDB$ROOT;

--

COL sid_serial_sql_1 NEW_V sid_serial_sql_1 NOPRI;

COL sid_serial_sql_2 NEW_V sid_serial_sql_2 NOPRI;

COL sid_serial_sql_3 NEW_V sid_serial_sql_3 NOPRI;

COL sid_serial_sql_4 NEW_V sid_serial_sql_4 NOPRI;

COL sid_serial_sql_5 NEW_V sid_serial_sql_5 NOPRI;

COL sid_serial_sql_6 NEW_V sid_serial_sql_6 NOPRI;

--

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

WITH

ash AS (

SELECT /*+ MATERIALIZE NO_MERGE */

sample_id,

sample_time,

machine,

session_id,

session_serial#,

blocking_session,

blocking_session_serial#,

session_state,

wait_class,

event,

sql_id,

top_level_sql_id

FROM v$active_session_history

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

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

),

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#

)

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

, by_sessions_sum AS (

SELECT /*+ MATERIALIZE NO_MERGE */

blocker_session_id, blocker_session_serial#, blocker_sql_id,

SUM(sessions_blocked) sessions_blocked,

ROW_NUMBER() OVER (ORDER BY SUM(sessions_blocked) DESC NULLS LAST) top_sum

FROM blockers_and_blockees

WHERE sessions_blocked > 0

--AND blocker_status = 'INACTIVE or UNKNOWN'

--AND machine NOT IN ('&&cs_host_name.', 'unknown')

GROUP BY

blocker_session_id, blocker_session_serial#, blocker_sql_id

)

SELECT MAX(CASE top_sum WHEN 1 THEN blocker_session_id||','||blocker_session_serial#||' '||blocker_sql_id END) sid_serial_sql_1,

MAX(CASE top_sum WHEN 2 THEN blocker_session_id||','||blocker_session_serial#||' '||blocker_sql_id END) sid_serial_sql_2,

MAX(CASE top_sum WHEN 3 THEN blocker_session_id||','||blocker_session_serial#||' '||blocker_sql_id END) sid_serial_sql_3,

MAX(CASE top_sum WHEN 4 THEN blocker_session_id||','||blocker_session_serial#||' '||blocker_sql_id END) sid_serial_sql_4,

MAX(CASE top_sum WHEN 5 THEN blocker_session_id||','||blocker_session_serial#||' '||blocker_sql_id END) sid_serial_sql_5,

MAX(CASE top_sum WHEN 6 THEN blocker_session_id||','||blocker_session_serial#||' '||blocker_sql_id END) sid_serial_sql_6

FROM by_sessions_sum

WHERE top_sum BETWEEN 1 AND 6

/

--

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

--

DEF report_title = 'Sessions Blocked by Root Blocker between &&cs_sample_time_from. and &&cs_sample_time_to. UTC';

DEF chart_title = '&&report_title.';

DEF xaxis_title = '';

DEF vaxis_title = 'Blocked Sessions Count';

--

-- (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."';

--

@@cs_internal/cs_spool_head_chart.sql

--

PRO ,{label:'&&sid_serial_sql_1.', id:'1', type:'number'}

PRO ,{label:'&&sid_serial_sql_2.', id:'2', type:'number'}

PRO ,{label:'&&sid_serial_sql_3.', id:'3', type:'number'}

PRO ,{label:'&&sid_serial_sql_4.', id:'4', type:'number'}

PRO ,{label:'&&sid_serial_sql_5.', id:'5', type:'number'}

PRO ,{label:'&&sid_serial_sql_6.', id:'6', type:'number'}

PRO ]

--

SET HEA OFF PAGES 0;

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

WITH

FUNCTION num_format (p_number IN NUMBER, p_round IN NUMBER DEFAULT 0)

RETURN VARCHAR2 IS

BEGIN

IF p_number IS NULL OR ROUND(p_number, p_round) <= 0 THEN

RETURN 'null';

ELSE

RETURN TO_CHAR(ROUND(p_number, p_round));

END IF;

END num_format;

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

ash AS (

SELECT /*+ MATERIALIZE NO_MERGE */

sample_id,

sample_time,

machine,

session_id,

session_serial#,

blocking_session,

blocking_session_serial#,

session_state,

wait_class,

event,

sql_id,

top_level_sql_id

FROM v$active_session_history

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

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

),

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#

)

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

SELECT ', [new Date('||

TO_CHAR(q.time, 'YYYY')|| /* year */

','||(TO_NUMBER(TO_CHAR(q.time, 'MM')) - 1)|| /* month - 1 */

','||TO_CHAR(q.time, 'DD')|| /* day */

','||TO_CHAR(q.time, 'HH24')|| /* hour */

','||TO_CHAR(q.time, 'MI')|| /* minute */

','||TO_CHAR(q.time, 'SS')|| /* second */

')'||

','||num_format(SUM(CASE q.blocker_session_id||','||q.blocker_session_serial#||' '||q.blocker_sql_id WHEN '&&sid_serial_sql_1.' THEN q.sessions_blocked ELSE 0 END))||

','||num_format(SUM(CASE q.blocker_session_id||','||q.blocker_session_serial#||' '||q.blocker_sql_id WHEN '&&sid_serial_sql_2.' THEN q.sessions_blocked ELSE 0 END))||

','||num_format(SUM(CASE q.blocker_session_id||','||q.blocker_session_serial#||' '||q.blocker_sql_id WHEN '&&sid_serial_sql_3.' THEN q.sessions_blocked ELSE 0 END))||

','||num_format(SUM(CASE q.blocker_session_id||','||q.blocker_session_serial#||' '||q.blocker_sql_id WHEN '&&sid_serial_sql_4.' THEN q.sessions_blocked ELSE 0 END))||

','||num_format(SUM(CASE q.blocker_session_id||','||q.blocker_session_serial#||' '||q.blocker_sql_id WHEN '&&sid_serial_sql_5.' THEN q.sessions_blocked ELSE 0 END))||

','||num_format(SUM(CASE q.blocker_session_id||','||q.blocker_session_serial#||' '||q.blocker_sql_id WHEN '&&sid_serial_sql_6.' THEN q.sessions_blocked ELSE 0 END))||

']'

FROM blockers_and_blockees q

WHERE q.sessions_blocked > 0

--AND q.blocker_status = 'INACTIVE or UNKNOWN'

--AND q.machine NOT IN ('&&cs_host_name.', 'unknown')

GROUP BY

q.time

ORDER BY

q.time

/

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

SET HEA ON PAGES 100;

--

-- [Line|Area|SteppedArea|Scatter]

DEF cs_chart_type = 'Scatter';

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

DEF cs_chart_option_explorer = '';

-- enable pie options with "" when using Pie

DEF cs_chart_option_pie = '//';

-- use oem colors

DEF cs_oem_colors_series = '//';

DEF cs_oem_colors_slices = '//';

-- for line charts

DEF cs_curve_type = '//';

--

@@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

--