Oracle SQL
  • LICENSE

Easy(lazy) way to check which programs have properly configured FetchSize

Posted on November 16, 2017 by Sayan Malakshinov Posted in oracle, SQL, statistics
select 
   s.module
  ,ceil(max(s.rows_processed/s.fetches)) rows_per_fetch
from v$sql s
where 
    s.rows_processed>100
and s.executions    >1
and s.fetches       >1
and s.module is not null
and s.command_type  = 3    -- SELECTs only
and s.program_id    = 0    -- do not account recursive queries from stored procs
and s.parsing_schema_id!=0 -- <> SYS
group by s.module
order by rows_per_fetch desc nulls last
/
arraysize fetchsize troubleshooting
« Revisiting buffer cache Very Large Object Threshold
Adaptive serial direct path read decision ignores object statistics since 12.1 »
photo Sayan Malakshinov

Oracle ACE Pro Oracle ACE Pro

DEVVYOracle Database Developer Choice Award winner

Oracle performance tuning expert

UK / Cambridge

LinkedIn   Twitter
sayan@orasql.org

Recent Posts

  • CBO and Partial indexing
  • Slow index access “COL=:N” where :N is NULL
  • Where does the commit or rollback happen in PL/SQL code?
  • :1 and SP2-0553: Illegal variable name “1”.
  • ORA exceptions that can’t be caught by exception handler

Recent Comments

  • Oracle SGA 값을 증가 시킬 때 발생 장애 원인 – DBA의 정석 on Example of controlling “direct path reads” decision through SQL profile hints (index_stats/table_stats)
  • Oracle SQL | Oracle diagnostic events — Cheat sheet on Where does the commit or rollback happen in PL/SQL code?
  • Functions & Subqueries | Oracle Scratchpad on Deterministic function vs scalar subquery caching. Part 3
  • Materialized views state turns into compilation_error after refresh - kranar.top - Answering users questions... on Friday prank: select from join join join
  • Exadata Catalogue | Oracle Scratchpad on When bloggers get it wrong – part 1
  • Exadata Catalogue | Oracle Scratchpad on Serial Scans failing to offload
  • lateral join – decorrelation gone wrong – svenweller on Lateral view decorrelation(VW_DCL) causes wrong results with rownum
  • 255 column catalogue | Oracle Scratchpad on Intra-block row chaining optimization in 12.2
  • 255 column catalogue | Oracle Scratchpad on row pieces, 255 columns, intra-block row chaining in details
  • opt_estimate catalogue | Oracle Scratchpad on Correct syntax for the table_stats hint

Blogroll

  • Alex Fatkulin
  • Alexander Anokhin
  • Andrey Nikolaev
  • Charles Hooper
  • Christian Antognini
  • Coskan Gundogar
  • David Fitzjarrell
  • Igor Usoltsev
  • Jonathan Lewis
  • Karl Arao
  • Mark Bobak
  • Martin Bach
  • Martin Berger
  • Neil Chandler
  • Randolf Geist
  • Richard Foote
  • Riyaj Shamsudeen
  • Tanel Poder
  • Timur Akhmadeev
  • Valentin Nikotin

Meta

  • Log in
  • Entries feed
  • Comments feed
  • WordPress.org
©Sayan Malakshinov. Oracle SQL