2026-03-12 20:23:15
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185
csierra/cs_dg_protection_mode_switches.sql
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185
csierra/cs_dg_protection_mode_switches.sql
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----------------------------------------------------------------------------------------
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--
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-- File name: cs_dg_protection_mode_switches.sql
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--
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-- Purpose: Data Guard Protection Mode Switches as per Log Archive Dest
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--
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-- Author: Carlos Sierra
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--
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-- Version: 2021/10/18
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--
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-- Usage: Execute connected to CDB or PDB
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--
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-- Example: $ sqlplus / as sysdba
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-- SQL> @cs_dg_protection_mode_switches.sql
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--
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-- Notes: Developed and tested on 12.1.0.2.
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--
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---------------------------------------------------------------------------------------
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--
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@@cs_internal/cs_primary.sql
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@@cs_internal/cs_set.sql
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@@cs_internal/cs_def.sql
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@@cs_internal/cs_file_prefix.sql
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--
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DEF cs_script_name = 'cs_dg_protection_mode_switches';
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--
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SELECT '&&cs_file_prefix._&&cs_script_name.' cs_file_name FROM DUAL;
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--
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@@cs_internal/cs_spool_head.sql
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PRO SQL> @&&cs_script_name..sql
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@@cs_internal/cs_spool_id.sql
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--
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@@cs_internal/&&cs_set_container_to_cdb_root.
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--
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COL begin_time FOR A19 HEA 'AWR SNAP|BEGIN TIME';
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COL end_time FOR A19 HEA 'AWR SNAP|END TIME';
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COL begin_host FOR A64 HEA 'AWR SNAP|BEGIN STANDBY HOST';
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COL end_host FOR A64 HEA 'AWR SNAP|END STANDBY HOST';
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COL min_date_time FOR A19 HEA 'LOGON STORM|BEGIN TIME';
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COL max_date_time FOR A19 HEA 'LOGON STORM|END TIME';
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COL max_aas FOR 99,999 HEA 'LOGON STORM|MAX AAS';
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COL max_machines FOR 999,990 HEA 'LOGON STORM|MAX AAS';
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COL seconds FOR 999,990 HEA 'LOGON STORM|SECONDS';
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COL max_pdbs FOR 999,990 HEA 'LOGON STORM|MAX PDBS';
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COL begin_mode FOR A15 HEA 'AWR SNAP|BEGIN MODE';
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COL end_mode FOR A15 HEA 'AWR SNAP|END MODE';
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COL mode_switch FOR A7 HEA 'MODE|SWITCH';
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COL switch_over FOR A7 HEA 'SWITCH|OVER';
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--
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BREAK ON mode_switch SKIP 1 DUPL;
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--
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PRO
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PRO DG PROTECTION MODE SWITCHES
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PRO ~~~~~~~~~~~~~~~~~~~~~~~~~~~
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WITH
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parameter_hist AS (
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SELECT /*+ MATERIALIZE NO_MERGE */
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h.snap_id,
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h.dbid,
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h.instance_number,
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h.parameter_name,
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LAG(h.value) OVER (PARTITION BY h.dbid, h.instance_number, h.parameter_name, h.con_id ORDER BY h.snap_id) AS prior_value,
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h.value,
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h.con_id
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FROM dba_hist_parameter h
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WHERE parameter_name LIKE 'log_archive_dest%'
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AND parameter_name NOT LIKE 'log_archive_dest_state%'
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),
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parameter_changes AS (
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SELECT /*+ MATERIALIZE NO_MERGE */
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h.snap_id,
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h.dbid,
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h.instance_number,
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h.parameter_name,
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h.prior_value,
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h.value,
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REPLACE(REPLACE(REGEXP_SUBSTR(h.prior_value, '\(HOST=([[:alnum:]]|\.|-)+\)'), '(HOST='), ')') AS begin_host,
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REPLACE(REPLACE(REGEXP_SUBSTR(h.value, '\(HOST=([[:alnum:]]|\.|-)+\)'), '(HOST='), ')') AS end_host,
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CASE
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WHEN h.prior_value LIKE '% SYNC AFFIRM %' THEN 'SYNC AFFIRM'
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WHEN h.prior_value LIKE '% ASYNC AFFIRM %' THEN 'ASYNC AFFIRM' -- not expected
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WHEN h.prior_value LIKE '% SYNC NOAFFIRM %' THEN 'SYNC NOAFFIRM' -- not expected
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WHEN h.prior_value LIKE '% ASYNC NOAFFIRM %' THEN 'ASYNC NOAFFIRM'
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END AS begin_mode,
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CASE
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WHEN h.value LIKE '% SYNC AFFIRM %' THEN 'SYNC AFFIRM'
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WHEN h.value LIKE '% ASYNC AFFIRM %' THEN 'ASYNC AFFIRM' -- not expected
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WHEN h.value LIKE '% SYNC NOAFFIRM %' THEN 'SYNC NOAFFIRM' -- not expected
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WHEN h.value LIKE '% ASYNC NOAFFIRM %' THEN 'ASYNC NOAFFIRM'
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END AS end_mode,
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h.con_id,
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s.begin_interval_time,
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s.end_interval_time
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FROM parameter_hist h,
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dba_hist_snapshot s
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WHERE NVL(h.value, '-666') <> NVL(h.prior_value, '-666')
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AND h.prior_value LIKE '%(HOST=%'
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AND h.value LIKE '%(HOST=%'
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AND s.snap_id = h.snap_id
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AND s.dbid = h.dbid
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AND s.instance_number = h.instance_number
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),
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dg_mode_switches AS (
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SELECT CAST(p.begin_interval_time AS DATE) AS begin_time,
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CAST(p.end_interval_time AS DATE) AS end_time,
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p.begin_mode,
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p.end_mode,
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p.begin_host,
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p.end_host
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FROM parameter_changes p
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),
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over_height AS (
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SELECT /*+ MATERIALIZE NO_MERGE */
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h.sample_time,
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COUNT(*) AS aas,
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COUNT(DISTINCT machine) AS machines,
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COUNT(DISTINCT con_id) AS pdbs,
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(CAST(h.sample_time AS DATE) - LAG(CAST(h.sample_time AS DATE)) OVER (ORDER BY h.sample_time)) * 24 * 3600 AS secs_from_prior
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FROM dba_hist_active_sess_history h
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GROUP BY
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h.sample_time
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HAVING COUNT(*) > 1000 -- active sessions!
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),
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over_time AS (
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SELECT CAST(h.sample_time AS DATE) AS sample_time,
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h.aas,
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h.machines,
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h.pdbs
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FROM over_height h
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WHERE secs_from_prior < 20 -- contiguous
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),
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logon_storms AS (
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SELECT TRUNC(sample_time) AS date_time,
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MIN(sample_time - (20/24/3600)) AS min_date_time,
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MAX(sample_time) AS max_date_time,
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((MAX(sample_time) - MIN(sample_time)) * 24 * 3600) + 20 AS seconds,
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MAX(aas) AS max_aas,
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MAX(machines) AS max_machines,
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MAX(pdbs) AS max_pdbs
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FROM over_time
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GROUP BY
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TRUNC(sample_time)
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)
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SELECT dg.begin_time,
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dg.end_time,
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dg.begin_mode,
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dg.end_mode,
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CASE dg.begin_mode WHEN 'ASYNC NOAFFIRM' THEN 'HP' WHEN 'SYNC AFFIRM' THEN 'HA' END||'->'||
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CASE dg.end_mode WHEN 'ASYNC NOAFFIRM' THEN 'HP' WHEN 'SYNC AFFIRM' THEN 'HA' END AS mode_switch,
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ls.min_date_time,
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ls.max_date_time,
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ls.seconds,
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ls.max_aas,
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ls.max_pdbs,
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dg.begin_host,
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dg.end_host,
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CASE WHEN dg.begin_host <> dg.end_host THEN 'YES' ELSE 'NO' END AS switch_over
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FROM dg_mode_switches dg
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OUTER APPLY (
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SELECT s.min_date_time,
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s.max_date_time,
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s.seconds,
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s.max_aas,
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s.max_pdbs
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FROM logon_storms s
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WHERE (s.min_date_time BETWEEN dg.begin_time AND dg.end_time OR s.max_date_time BETWEEN dg.begin_time AND dg.end_time)
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AND ROWNUM >= 1 /* MATERIALIZE NO_MERGE */
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ORDER BY
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s.min_date_time ASC
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FETCH FIRST 1 ROW ONLY
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) ls
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ORDER BY
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dg.begin_time
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/
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--
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PRO
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PRO SQL> @&&cs_script_name..sql
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--
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@@cs_internal/cs_spool_tail.sql
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--
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@@cs_internal/&&cs_set_container_to_curr_pdb.
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--
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@@cs_internal/cs_undef.sql
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@@cs_internal/cs_reset.sql
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--
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