Postgresql Performance
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- huge shared_blocks_hit one select but manually run very fast,
James Pang
- Why a bitmap scan in this case?,
Jon Zeppieri
- Aggressive vacuum,
Graham Hay
- can a blocked transaction affect the performance of one that is blocking it?,
Eric Schwarzenbach
- PostgreSQL and a Catch-22 Issue related to dead rows,
Lars Aksel Opsahl
- time data type question,
Sbob
- Reg. Postgres Unique contraint,
Sajjad Abid
- CTE Inline On TPC-DS Query 95,
Ba Jinsheng
- Performance of TPC-DS Query 95,
Ba Jinsheng
- Cardinality estimate of the inner relation,
Frédéric Yhuel
- Performance of Query 60 on TPC-DS Benchmark,
Ba Jinsheng
- could not send data to client: Connection reset by peer,
James Pang
- Performance of Query 4 on TPC-DS Benchmark,
Ba Jinsheng
- tds_fdw : Severe performance degradation from postgresql 10.23 to 16.4,
Achilleas Mantzios
- Major performance degradation with joins in 15.8 or 15.7?,
Ed Sabol
- Performance of Query 2 in TPC-H,
Ba Jinsheng
- Postgresql 14/15/16/17 partition pruning on dependent table during join,
Stepan Yankevych
- Re: proposal: schema variables,
James Pang
- lwlock:LockManager wait_events,
James Pang
- Unexpected Performance for the Function simplify_function,
Ba Jinsheng
- Partitioned table scanning all pertitions when the where clause specifies the partition key,
Sbob
- Adding exclusion constraint in a big table,
Marcelo Fernandes
- ERROR Inserting into partition,
Sbob
- PostgreSQL Package conflicts on Fedora 40,
Sbob
- Bloom filters and the planner / parallel execution,
Daniel Westermann (DWE)
- Performance degradation in Index searches with special characters,
Andrey Stikheev
- Has gen_random_uuid() gotten much slower in v17?,
David Mullineux
- many backends hang on MultiXactOffsetSLRU,
James Pang
- Re: many backends hang on MultiXactOffsetSLRU,
Alvaro Herrera
Re: Estimate of the inner_rows,
Tom Lane
checking for a NULL date in a partitioned table kills performance (accidentally sent to the admin list before),
Sbob
checking for a NULL date in a partitioned table kills performance,
Sbob
Trying to understand why a query is filtering when there is a composite index,
Stephen Samuel (Sam)
Partition pruning with array-contains check and current_setting function,
Marcelo Zabani
logical replication out of memory,
James Pang
Re: logical replication out of memory,
khan Affan
Help with row estimate problem,
Jon Zeppieri
Outer cost higher than the inner cost,
Stanisław Skonieczny
inequality predicate not pushed down in JOIN?,
Paul George
Specific objects backup in PostgreSQL,
nikhil kumar
Low performance between datacenters,
Tamás PAPP
How to solve my slow disk i/o throughput during index scan,
FREYBURGER Simon (SNCF VOYAGEURS / DIRECTION GENERALE TGV / DM RMP YIELD MANAGEMENT)
Hash Right join and seq scan,
James Pang
a lot of shared buffers hit when planning for a simple query with primary access path,
James Pang
Inconsistent query performance based on relation hit frequency,
Laura Hausmann
Row level security,
Thomas Simpson
performance of sql and plpgsql functions,
Julius Tuskenis
BDR that performs,
Smith, Travis
Need help on configuration SMTP,
nikhil kumar
Postgresql initialize error,
nikhil kumar
Distinct performance dropped by multiple times in v16,
Vitaliy Litovskiy
query column in pg_stat_statements and pg_stat_activity,
Satalabaha Postgres
Plan selection based on worst case scenario,
Darwin O'Connor
Extremely slow to establish connection when user has a high number of roles,
Michal Charemza
LWlock:LockManager waits,
James Pang
IN subquery, many joins, very different plans,
Dave Thorn
maintenance_work_mem impact?,
Adithya Kumaranchath
Separate 100 M spatial data in 100 tables VS one big table,
kimaidou
Re: Is partition pruning impacted by data type,
sud
Table Partitioning and Indexes Performance Questions,
David Kelly
generic plan generate poor performance,
James Pang
extend statistics help reduce index scan a lot of shared buffer hits.,
James Pang
Optimizing count(), but Explain estimates wildly off,
Chema
sql statement not using all primary key values and poor performance,
James Pang
"not related" code blocks for removal of dead rows when using vacuum and this kills the performance,
Lars Aksel Opsahl
PostgreSQL doesn't use index-only scan if there is an expression in index,
Pavel Kulakov
Simple JOIN on heavy table not using expected index,
kimaidou
Memory growth using many named prepared statements, in spite of using DISCARD ALL afterwards.,
Daniel Blanch Bataller
huge SubtransSLRU and SubtransBuffer wait_event,
James Pang (chaolpan)
Slow query in table where many rows were deleted. VACUUM FULL fixes it,
Pavlos Kallis
I don't understand that EXPLAIN PLAN timings,
Jean-Christophe Boggio
Why is a sort required for this query? (IS NULL predicate on leading key column),
Jerry Brenner
Selection not "pushed down into" CTE,
Clemens Eisserer
Questions about "Output" in EXPLAIN ANALYZE VERBOSE,
Jerry Brenner
Slow GroupAggregate and Sort,
Darwin Correa
Need help with performance tuning pg12 on linux,
Wilson, Maria Louise (LARC-E301)[RSES]
Parallel hints in PostgreSQL with consistent perfromance,
mohini mane
Which side of a Merge Join gets executed first? Do both sides always get executed?,
Jerry Brenner
2 json explain plans for the same query/plan - why does one have constants while the other has parameter markers?,
Jerry Brenner
Question about semantics of $ variables in json explain plans in 13,
Jerry Brenner
Include a timestamp in future versions of pg_stat_statements when when a query entered the cache?,
Jerry Brenner
Does Postgres have consistent identifiers (plan hash value) for explain plans?,
Jerry Brenner
Strange "actual time" in simple CTE,
Jean-Christophe Boggio
Performance degradation with CTEs, switching from PG 11 to PG 15,
Jean-Christophe Boggio
[no subject],
Gulp
simple query running long time within a long transaction.,
James Pang (chaolpan)
Awkward Join between generate_series and long table,
Lincoln Swaine-Moore
GIN JSONB path index is not always used,
Tomasz Szymański
Underestimated number of output rows with an aggregate function,
Philippe BEAUDOIN
Postgres 15 SELECT query doesn't use index under RLS,
Alexander Okulovich
Unexpected termination looping over table.,
Matt Gibbins
Dirty reads on index scan,,
Koen De Groote
pgsql 10.23 , different systems, same table , same plan, different Buffers: shared hit,
Achilleas Mantzios - cloud
- Re: pgsql 10.23 , different systems, same table , same plan, different Buffers: shared hit,
Tom Lane
- Re: pgsql 10.23 , different systems, same table , same plan, different Buffers: shared hit,
Achilleas Mantzios
- Re: pgsql 10.23 , different systems, same table , same plan, different Buffers: shared hit,
Tom Lane
- Re: pgsql 10.23 , different systems, same table , same plan, different Buffers: shared hit,
Achilleas Mantzios
- Re: pgsql 10.23 , different systems, same table , same plan, different Buffers: shared hit,
Thomas Munro
Multixact wraparound monitoring,
bruno da silva
Planning time is time-consuming,
Mikhail Balayan
Re: Planning time is time-consuming,
David Rowley
Re: Planning time is time-consuming,
Imre Samu
query pg_stat_ssl hang 100%cpu,
James Pang (chaolpan)
Join order optimization,
Christian Beikov
Queries containing ORDER BY and LIMIT started to work slowly,
Rondat Flyag
Range partitioning query performance with date_trunc (vs timescaledb),
Philippe Pepiot
Index bloat and REINDEX/VACUUM optimization for partial index,
jayaprabhakar k
Slow query, possibly not using index,
Les
Question regarding writes when locking rows,
Martin Querleu
Partitioning update-heavy queue with hash partitions vs partial indexes,
Dorian Hoxha
Function call very slow from JDBC/java but super fast from DBear,
An, Hongguo (CORP)
Plan weirdness. A sort produces more rows than the node beneath it,
Dane Foster
Table copy with SERIALIZABLE is incredibly slow,
peter plachta
Results of experiments with UUIDv7, UUIDv8,
peter plachta
TOAST Fields serialisation/deserialization performance,
Piyush Katariya
Entire index scanned, but only when in SQL function?,
Philip Semanchuk
Performance implications of 8K pread()s,
Dimitrios Apostolou
Why is query performance on RLS enabled Postgres worse?,
Akash Anand
Fwd: Helping planner to chose sequential scan when it improves performance,
Patrick O'Toole
Index on (fixed size) bytea value,
Les
Merge David and Goliath tables efficiently,
Nicolas Paris
extended statistics n-distinct on multiple columns not used when join two tables,
James Pang (chaolpan)
Forced to use UNION ALL when having multiple ANY operators and ORDER BY LIMIT,
benoit
Postgresql equal join on function with columns not use index,
James Pang (chaolpan)
wrong rows estimation by hash join,
James Pang (chaolpan)
Weird behavior of INSERT QUERY,
Satalabaha Postgres
Understand time taken by individual SQL statements in a procedure,
Satalabaha Postgres
thousands of CachedPlan entry per backend,
James Pang (chaolpan)
How to reduce latency with fast short queries in Postgresql 15.3 on a NUMA server,
Sergio Rus
Unaccounted regression from postgresql 11 in later versions,
Bob Jolliffe
PostgreSQL performance on ARM i.MX6,
Druckenmueller, Marc
Connection drops on postgres 11.16,
aditya desai
Fsync IO issue,
ProfiVPS Support
Performance issues in query with multiple joins,
Παρασκευη Πασσαρη
How do Monitoring tools capture explain plan of a query,
kunwar singh
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