2026-03-12 20:23:15
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389
tpt/exadata/exasnap.sql
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389
tpt/exadata/exasnap.sql
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-- Copyright 2018 Tanel Poder. All rights reserved. More info at http://tanelpoder.com
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-- Licensed under the Apache License, Version 2.0. See LICENSE.txt for terms & conditions.
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--------------------------------------------------------------------------------
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-- File name: exasnap.sql (Exadata Snapper) BETA
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--
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-- Purpose: Display various Exadata IO efficiency metrics of a session
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-- from V$SESSTAT.
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--
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-- Author: Tanel Poder ( http://blog.tanelpoder.com | tanel@tanelpoder.com )
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--
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-- Copyright: (c) 2012 All Rights Reserved
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--
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-- Usage:
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-- 1) TAKE A SNAPSHOT
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--
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-- SELECT exasnap.begin_snap(<sid>) FROM dual;
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-- or
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-- SELECT exasnap.begin_snap('<sid>[@<instance#>]') FROM dual;
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--
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-- 2) Run the measured query in the session you snapshotted
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-- (or just wait for it to run a while)
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--
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-- 3) TAKE A 2ND SNAPSHOT
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--
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-- SELECT exasnap.begin_snap(<sid>) FROM dual;
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-- or
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-- SELECT exasnap.begin_snap('<sid>[@<instance#>]') FROM dual;
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--
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-- 4) REPORT SESSION METRICS
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--
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-- @exasnap.sql basic <begin_snap> <end_snap>
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-- or
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-- @exasnap.sql % <begin_snap> <end_snap>
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--
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-- The latter script gives you more output.
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--
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-- Other: This is still a pretty raw script in development and will
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-- probably change a lot once it reaches v1.0.
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--
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-- The PX slaves aggregate their metrics back to the QC session
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-- once the query completes, so querying the QC session only is
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-- ok if you wait for the query to finish (or cancel it) before
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-- taking a snapshot.
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-- To measure a query still running,
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--
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--------------------------------------------------------------------------------
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SET LINES 999 PAGES 5000 TRIMOUT ON TRIMSPOOL ON TAB OFF
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COL ioeff_percentage FOR A52
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BREAK ON inst_id SKIP 1 ON SID ON CATEGORY SKIP 1 DUP
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-- keep in capital (MB or GB)
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DEF unit=MB
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-- adjust for MB or GB
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DEF divisor=1024*1024
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DEF blocksize=8192
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DEF asm_mirrors=2
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DEFINE nothing =""
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PROMPT
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PROMPT ---------------------------------------------------------------------------------------------------------------------------------------------¬hing
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PROMPT -- Exadata Snapper v0.5 BETA by Tanel Poder @ Enkitec - The Exadata Experts ( http://www.enkitec.com )
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PROMPT ---------------------------------------------------------------------------------------------------------------------------------------------¬hing
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WITH stats AS (
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SELECT
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stat_name name
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, SUM(delta) value
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, AVG(snap_seconds) snap_seconds -- is the same for all records in this snap_id
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FROM (
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SELECT
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esn1.snap_id
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, esn1.snap_time begin_snap_time
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, esn2.snap_time end_snap_time
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, esn2.snap_time - esn1.snap_time snap_interval
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, TO_NUMBER(EXTRACT(second from esn2.snap_time - esn1.snap_time)) +
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TO_NUMBER(EXTRACT(minute from esn2.snap_time - esn1.snap_time)) * 60 +
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TO_NUMBER(EXTRACT(hour from esn2.snap_time - esn1.snap_time)) * 60 * 60 +
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TO_NUMBER(EXTRACT(day from esn2.snap_time - esn1.snap_time)) * 60 * 60 * 24 +
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-- TODO this is not needed
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TO_NUMBER(TO_CHAR(esn2.snap_time,'xFF')) -
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TO_NUMBER(TO_CHAR(esn1.snap_time,'xFF')) snap_seconds -- looks like the last part is buggy but it's too late to figure this out!
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, esn1.snap_name begin_snap_name
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, esn2.snap_name end_snap_name
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, ess1.stat_name
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, ess1.value begin_value
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, ess2.value end_value
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, ess2.value - ess1.value delta
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FROM
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ex_snapshot esn1
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, ex_session es1
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, ex_sesstat ess1
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, ex_snapshot esn2
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, ex_session es2
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, ex_sesstat ess2
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WHERE
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-- snap_id
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esn1.snap_id = es1.snap_id
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AND ess1.snap_id = esn1.snap_id
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AND es1.snap_id = ess1.snap_id
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AND es1.inst_id = ess1.inst_id
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AND es1.sid = ess1.sid
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AND es1.serial# = ess1.serial#
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--
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AND esn2.snap_id = es2.snap_id
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AND es2.snap_id = ess2.snap_id
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AND ess2.snap_id = esn2.snap_id
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AND es2.inst_id = ess2.inst_id
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AND es2.sid = ess2.sid
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AND es2.serial# = ess2.serial#
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AND ess1.stat_name = ess2.stat_name
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AND ess1.inst_id = ess2.inst_id
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AND ess1.sid = ess2.sid
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AND ess1.serial# = ess2.serial#
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--
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AND esn1.snap_id = &2
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AND esn2.snap_id = &3
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--
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-- AND ess2.value - ess1.value != 0 -- for testing
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)
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GROUP BY
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stat_name
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),
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sq AS (
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SELECT
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*
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FROM (
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SELECT
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0 inst_id
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, 0 sid
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, CASE WHEN TRIM(name) IN (
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'cell physical IO bytes sent directly to DB node to balance CPU'
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, 'cell physical IO bytes pushed back due to excessive CPU on cell'
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, 'cell physical IO bytes sent directly to DB node to balanceCPU u'
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) THEN
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'cell physical IO bytes sent directly to DB node to balance CPU'
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ELSE name
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END name
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, value
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FROM
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--gv$sesstat NATURAL JOIN v$statname
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stats
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WHERE
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1=1
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-- AND (name LIKE 'cell%bytes%' OR name LIKE 'physical%bytes%')
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AND TRIM(name) IN (
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'physical read total bytes'
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, 'physical write total bytes'
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, 'physical read total bytes optimized'
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, 'cell physical IO bytes eligible for predicate offload'
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, 'cell physical IO interconnect bytes'
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, 'cell physical IO interconnect bytes returned by smart scan'
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, 'cell physical IO bytes saved by storage index'
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, 'cell IO uncompressed bytes'
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, 'cell blocks processed by cache layer'
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, 'cell blocks processed by txn layer'
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, 'cell blocks processed by data layer'
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, 'cell blocks processed by index layer'
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, 'db block gets from cache'
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, 'consistent gets from cache'
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, 'db block gets direct'
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, 'consistent gets direct'
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-- following three stats are the same thing (named differently in different versions)
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, 'cell physical IO bytes sent directly to DB node to balance CPU'
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, 'cell physical IO bytes pushed back due to excessive CPU on cell'
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, 'cell physical IO bytes sent directly to DB node to balanceCPU u'
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, 'bytes sent via SQL*Net to client'
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, 'bytes received via SQL*Net from client'
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, 'table fetch continued row'
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, 'chained rows skipped by cell'
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, 'chained rows processed by cell'
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, 'chained rows rejected by cell'
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)
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)
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PIVOT (
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SUM(value)
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FOR name IN (
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'physical read total bytes' AS phyrd_bytes
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, 'physical write total bytes' AS phywr_bytes
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, 'physical read total bytes optimized' AS phyrd_optim_bytes
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, 'cell physical IO bytes eligible for predicate offload' AS pred_offloadable_bytes
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, 'cell physical IO interconnect bytes' AS interconnect_bytes
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, 'cell physical IO interconnect bytes returned by smart scan' AS smart_scan_ret_bytes
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, 'cell physical IO bytes saved by storage index' AS storidx_saved_bytes
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, 'cell IO uncompressed bytes' AS uncompressed_bytes
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, 'cell blocks processed by cache layer' AS cell_proc_cache_blk
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, 'cell blocks processed by txn layer' AS cell_proc_txn_blk
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, 'cell blocks processed by data layer' AS cell_proc_data_blk
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, 'cell blocks processed by index layer' AS cell_proc_index_blk
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, 'db block gets from cache' AS curr_gets_cache_blk
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, 'consistent gets from cache' AS cons_gets_cache_blk
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, 'db block gets direct' AS curr_gets_direct_blk
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, 'consistent gets direct' AS cons_gets_direct_blk
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, 'cell physical IO bytes sent directly to DB node to balance CPU' AS cell_bal_cpu_bytes
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, 'bytes sent via SQL*Net to client' AS net_to_client_bytes
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, 'bytes received via SQL*Net from client' AS net_from_client_bytes
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, 'table fetch continued row' AS chain_fetch_cont_row
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, 'chained rows skipped by cell' AS chain_rows_skipped
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, 'chained rows processed by cell' AS chain_rows_processed
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, 'chained rows rejected by cell' AS chain_rows_rejected
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)
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)
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),
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precalc AS (
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SELECT
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inst_id
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, sid
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, ROUND((phyrd_bytes)/(&divisor)) db_physrd_&unit
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, ROUND((phywr_bytes)/(&divisor)) db_physwr_&unit
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, ROUND((phyrd_bytes+phywr_bytes)/(&divisor)) db_physio_&unit
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, ROUND(pred_offloadable_bytes/(&divisor)) pred_offloadable_&unit
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, ROUND(phyrd_optim_bytes/(&divisor)) phyrd_optim_&unit
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, ROUND((phyrd_optim_bytes-storidx_saved_bytes)/(&divisor)) phyrd_flash_rd_&unit
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, ROUND(storidx_saved_bytes/(&divisor)) phyrd_storidx_saved_&unit
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, ROUND((phyrd_bytes-phyrd_optim_bytes)/(&divisor)) spin_disk_rd_&unit
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, ROUND((phyrd_bytes-phyrd_optim_bytes+(phywr_bytes*&asm_mirrors))/(&divisor)) spin_disk_io_&unit
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, ROUND(uncompressed_bytes/(&divisor)) scanned_uncomp_&unit
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, ROUND(interconnect_bytes/(&divisor)) total_ic_&unit
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, ROUND(smart_scan_ret_bytes/(&divisor)) smart_scan_ret_&unit
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, ROUND((interconnect_bytes-smart_scan_ret_bytes)/(&divisor)) non_smart_scan_&unit
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, ROUND(cell_proc_cache_blk * &blocksize / (&divisor)) cell_proc_cache_&unit
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, ROUND(cell_proc_txn_blk * &blocksize / (&divisor)) cell_proc_txn_&unit
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, ROUND(cell_proc_data_blk * &blocksize / (&divisor)) cell_proc_data_&unit
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, ROUND(cell_proc_index_blk * &blocksize / (&divisor)) cell_proc_index_&unit
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, ROUND(curr_gets_cache_blk * &blocksize / (&divisor)) curr_gets_cache_&unit
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, ROUND(cons_gets_cache_blk * &blocksize / (&divisor)) cons_gets_cache_&unit
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, ROUND(curr_gets_direct_blk * &blocksize / (&divisor)) curr_gets_direct_&unit
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, ROUND(cons_gets_direct_blk * &blocksize / (&divisor)) cons_gets_direct_&unit
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, ROUND(cell_bal_cpu_bytes / (&divisor)) cell_bal_cpu_&unit
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, ROUND(net_to_client_bytes / (&divisor)) net_to_client_&unit
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, ROUND(net_from_client_bytes / (&divisor)) net_from_client_&unit
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, chain_fetch_cont_row
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, chain_rows_skipped
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, chain_rows_processed
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, chain_rows_rejected
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FROM sq
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),
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precalc2 AS (
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SELECT
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inst_id
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, sid
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, db_physio_&unit
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, db_physrd_&unit
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, db_physwr_&unit
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, pred_offloadable_&unit
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, phyrd_optim_&unit
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, phyrd_flash_rd_&unit + spin_disk_rd_&unit phyrd_disk_and_flash_&unit
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, phyrd_flash_rd_&unit
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, phyrd_storidx_saved_&unit
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, spin_disk_io_&unit
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, spin_disk_rd_&unit
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, ((spin_disk_io_&unit - spin_disk_rd_&unit)) AS spin_disk_wr_&unit
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, scanned_uncomp_&unit
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, ROUND((scanned_uncomp_&unit/NULLIF(spin_disk_rd_&unit + phyrd_flash_rd_&unit, 0))*db_physrd_&unit) est_full_uncomp_&unit
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, total_ic_&unit
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, smart_scan_ret_&unit
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, non_smart_scan_&unit
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, cell_proc_cache_&unit
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, cell_proc_txn_&unit
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, cell_proc_data_&unit
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, cell_proc_index_&unit
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, cell_bal_cpu_&unit
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, curr_gets_cache_&unit
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, cons_gets_cache_&unit
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, curr_gets_direct_&unit
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, cons_gets_direct_&unit
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, net_to_client_&unit
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, net_from_client_&unit
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, chain_fetch_cont_row
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, chain_rows_skipped
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, chain_rows_processed
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, chain_rows_rejected
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FROM
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precalc
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),
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--SELECT
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-- inst_id
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-- , SUM(db_physio_&unit)
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-- , SUM(db_physrd_&unit)
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-- , SUM(db_physwr_&unit)
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-- , SUM(pred_offloadable_&unit)
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-- , SUM(phyrd_optim_&unit)
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-- , SUM(spin_disk_io_&unit)
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-- , SUM(spin_disk_rd_&unit)
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-- , SUM(spin_disk_io_&unit - spin_disk_rd_&unit) AS spin_disk_wr_&unit
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-- , SUM(scanned_uncomp_&unit)
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-- , ROUND(SUM((scanned_uncomp_&unit/spin_disk_rd_&unit)*db_physrd_&unit)) AS est_full_uncomp_&unit
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-- , SUM(total_ic_&unit)
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-- , SUM(smart_scan_ret_&unit)
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-- , SUM(non_smart_scan_&unit)
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--FROM
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-- precalc2
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--GROUP BY ROLLUP
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-- (inst_id)
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--/
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unpivoted AS (
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SELECT * FROM precalc2
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UNPIVOT (
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&unit
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FOR metric
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IN (
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phyrd_optim_&unit
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, phyrd_disk_and_flash_&unit
|
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, phyrd_flash_rd_&unit
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, phyrd_storidx_saved_&unit
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, spin_disk_rd_&unit
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, spin_disk_wr_&unit
|
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, spin_disk_io_&unit
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, db_physrd_&unit
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, db_physwr_&unit
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, db_physio_&unit
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, scanned_uncomp_&unit
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, est_full_uncomp_&unit
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, non_smart_scan_&unit
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, smart_scan_ret_&unit
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, total_ic_&unit
|
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, pred_offloadable_&unit
|
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, cell_proc_cache_&unit
|
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, cell_proc_txn_&unit
|
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, cell_proc_data_&unit
|
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, cell_proc_index_&unit
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, cell_bal_cpu_&unit
|
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, curr_gets_cache_&unit
|
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, cons_gets_cache_&unit
|
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, curr_gets_direct_&unit
|
||||
, cons_gets_direct_&unit
|
||||
, net_to_client_&unit
|
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, net_from_client_&unit
|
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, chain_fetch_cont_row
|
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, chain_rows_skipped
|
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, chain_rows_processed
|
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, chain_rows_rejected
|
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)
|
||||
)
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),
|
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metric AS (
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SELECT 'BASIC' type, 'DB_LAYER_IO' category, 'DB_PHYSIO_&unit' name FROM dual UNION ALL
|
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SELECT 'BASIC', 'DB_LAYER_IO', 'DB_PHYSRD_&unit' FROM dual UNION ALL
|
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SELECT 'BASIC', 'DB_LAYER_IO', 'DB_PHYSWR_&unit' FROM dual UNION ALL
|
||||
SELECT 'ADVANCED', 'AVOID_DISK_IO', 'PHYRD_OPTIM_&unit' FROM dual UNION ALL
|
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SELECT 'ADVANCED', 'AVOID_DISK_IO', 'PHYRD_DISK_AND_FLASH_&unit' FROM dual UNION ALL
|
||||
SELECT 'BASIC', 'AVOID_DISK_IO', 'PHYRD_FLASH_RD_&unit' FROM dual UNION ALL
|
||||
SELECT 'BASIC', 'AVOID_DISK_IO', 'PHYRD_STORIDX_SAVED_&unit' FROM dual UNION ALL
|
||||
SELECT 'BASIC', 'REAL_DISK_IO', 'SPIN_DISK_IO_&unit' FROM dual UNION ALL
|
||||
SELECT 'BASIC', 'REAL_DISK_IO', 'SPIN_DISK_RD_&unit' FROM dual UNION ALL
|
||||
SELECT 'BASIC', 'REAL_DISK_IO', 'SPIN_DISK_WR_&unit' FROM dual UNION ALL
|
||||
SELECT 'ADVANCED', 'COMPRESS', 'SCANNED_UNCOMP_&unit' FROM dual UNION ALL
|
||||
SELECT 'ADVANCED', 'COMPRESS', 'EST_FULL_UNCOMP_&unit' FROM dual UNION ALL
|
||||
SELECT 'BASIC', 'REDUCE_INTERCONNECT', 'PRED_OFFLOADABLE_&unit' FROM dual UNION ALL
|
||||
SELECT 'BASIC', 'REDUCE_INTERCONNECT', 'TOTAL_IC_&unit' FROM dual UNION ALL
|
||||
SELECT 'BASIC', 'REDUCE_INTERCONNECT', 'SMART_SCAN_RET_&unit' FROM dual UNION ALL
|
||||
SELECT 'BASIC', 'REDUCE_INTERCONNECT', 'NON_SMART_SCAN_&unit' FROM dual UNION ALL
|
||||
SELECT 'ADVANCED', 'CELL_PROC_DEPTH', 'CELL_PROC_CACHE_&unit' FROM DUAL UNION ALL
|
||||
SELECT 'ADVANCED', 'CELL_PROC_DEPTH', 'CELL_PROC_TXN_&unit' FROM DUAL UNION ALL
|
||||
SELECT 'BASIC', 'CELL_PROC_DEPTH', 'CELL_PROC_DATA_&unit' FROM DUAL UNION ALL
|
||||
SELECT 'BASIC', 'CELL_PROC_DEPTH', 'CELL_PROC_INDEX_&unit' FROM DUAL UNION ALL
|
||||
SELECT 'ADVANCED', 'CELL_PROC_DEPTH', 'CELL_BAL_CPU_&unit' FROM DUAL UNION ALL
|
||||
SELECT 'ADVANCED', 'IN_DB_PROCESSING', 'CURR_GETS_CACHE_&unit' FROM DUAL UNION ALL
|
||||
SELECT 'ADVANCED', 'IN_DB_PROCESSING', 'CONS_GETS_CACHE_&unit' FROM DUAL UNION ALL
|
||||
SELECT 'ADVANCED', 'IN_DB_PROCESSING', 'CURR_GETS_DIRECT_&unit' FROM DUAL UNION ALL
|
||||
SELECT 'ADVANCED', 'IN_DB_PROCESSING', 'CONS_GETS_DIRECT_&unit' FROM DUAL UNION ALL
|
||||
SELECT 'BASIC', 'CLIENT_COMMUNICATION', 'NET_TO_CLIENT_&unit' FROM DUAL UNION ALL
|
||||
SELECT 'BASIC', 'CLIENT_COMMUNICATION', 'NET_FROM_CLIENT_&unit' FROM DUAL UNION ALL
|
||||
SELECT 'ADVANCED', 'FALLBACK_TO_BLOCK_IO', 'CHAIN_FETCH_CONT_ROW' FROM DUAL UNION ALL
|
||||
SELECT 'ADVANCED', 'FALLBACK_TO_BLOCK_IO', 'CHAIN_ROWS_SKIPPED' FROM DUAL UNION ALL
|
||||
SELECT 'ADVANCED', 'FALLBACK_TO_BLOCK_IO', 'CHAIN_ROWS_PROCESSED' FROM DUAL UNION ALL
|
||||
SELECT 'ADVANCED', 'FALLBACK_TO_BLOCK_IO', 'CHAIN_ROWS_REJECTED' FROM DUAL
|
||||
)
|
||||
SELECT
|
||||
-- inst_id
|
||||
-- , sid
|
||||
category
|
||||
-- , type
|
||||
, metric
|
||||
, '|'||RPAD(NVL(RPAD('#', ROUND(&unit / NULLIF( (SELECT MAX(&unit) FROM unpivoted u, metric m WHERE u.metric = m.name AND m.type LIKE UPPER('&1')), 0) * 50 ), '#'), ' '), 50, ' ')||'|' ioeff_percentage
|
||||
, &unit
|
||||
, TO_CHAR(ROUND(&unit / (SELECT snap_seconds FROM stats WHERE rownum = 1),1), '9999999.9') AS " &unit/sec"
|
||||
FROM
|
||||
unpivoted u
|
||||
, metric m
|
||||
WHERE
|
||||
u.metric = m.name
|
||||
AND m.type LIKE UPPER('&1')
|
||||
/
|
||||
Reference in New Issue
Block a user