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with autovacuum truncation in busy workloads (Jan Wieck)</p>\n<p>Truncation of empty pages at the end of a table requires exclusive lock, but autovacuum was coded to fail (and release the table lock) when there are conflicting lock requests. Under load, it is easily possible that truncation would never occur, resulting in table bloat. Fix by performing a partial truncation, releasing the lock, then attempting to re-acquire the lock and continue. This fix also greatly reduces the average time before autovacuum releases the lock after a conflicting request arrives.</p>", "text": "Fix performance problems with autovacuum truncation in busy workloads (Jan Wieck) Truncation of empty pages at the end of a table requires exclusive lock, but autovacuum was coded to fail (and release the table lock) when there are conflicting lock requests. Under load, it is easily possible that truncation would never occur, resulting in table bloat. Fix by performing a partial truncation, releasing the lock, then attempting to re-acquire the lock and continue. This fix also greatly reduces the average time before autovacuum releases the lock after a conflicting request arrives.", "title": "Fix performance problems with autovacuum truncation in busy workloads", "commits": [], "section": "Changes", "category": "bugfix", "source_url": "/docs/release/9.2.3/#AEN113847", "source_hash": "a783d1fc824a4b1541252431039f7f3c7b846d5559c86a17852ffe205b266154", "section_path": ["Changes"], "commit_groups": [], "identity_text": "Fix performance problems with autovacuum truncation in busy workloads (Jan Wieck) Truncation of empty pages at the end of a table requires exclusive lock, but autovacuum was coded to fail (and release the table lock) when there are conflicting lock requests. Under load, it is easily possible that truncation would never occur, resulting in table bloat. Fix by performing a partial truncation, releasing the lock, then attempting to re-acquire the lock and continue. This fix also greatly reduces the average time before autovacuum releases the lock after a conflicting request arrives.", "commit_aliases": [], "source_commits": [], "source_entry_id": "9.2.3/changes/011", "db_id": "54219d51cf8c2a51712e6c63125aa984", "patch_ids": [], "statement_hash": "875ccfe31c156a689602f0b94b37996e94934844623d1dc53baaeb2f3f262707", "relations": [{"rule": 2, "type": "equivalent", "target": "3d37c1cba00aaff6d71eb9162c03d0a4", "evidence": {"same_day": true, "patch_ids": [], "statement_hash": "875ccfe31c156a689602f0b94b37996e94934844623d1dc53baaeb2f3f262707"}}, {"rule": 2, "type": "equivalent", "target": "ff055e53d870d7dc5b5d43ba36306047", "evidence": {"same_day": true, "patch_ids": [], "statement_hash": "875ccfe31c156a689602f0b94b37996e94934844623d1dc53baaeb2f3f262707"}}], "version": "9.2.3", "category_label": "Bug fixes", "also_in": [], "variants": [], "related_changes": [{"db_id": "ff055e53d870d7dc5b5d43ba36306047", "kind": "equivalent", "version": "9.1.8", "label": "9.1.8", "title": "Fix performance problems with autovacuum truncation in busy workloads", "evidence": {"same_day": true, "patch_ids": [], "statement_hash": "875ccfe31c156a689602f0b94b37996e94934844623d1dc53baaeb2f3f262707"}, "url": "/docs/compare/?release=9.1.8#9.1.8-0cb8f7657a2c49b1", "source_url": "/docs/release/9.1.8/#AEN109130"}, {"db_id": "3d37c1cba00aaff6d71eb9162c03d0a4", "kind": "equivalent", "version": "9.0.12", "label": "9.0.12", "title": "Fix performance problems with autovacuum truncation in busy workloads", "evidence": {"same_day": true, "patch_ids": [], "statement_hash": "875ccfe31c156a689602f0b94b37996e94934844623d1dc53baaeb2f3f262707"}, "url": "/docs/compare/?release=9.0.12#9.0.12-0cb8f7657a2c49b1", "source_url": "/docs/release/9.0.12/#AEN100734"}]}, {"id": "9.2.3-53f2832c6727dd27", "cves": [], "html": "<p>Improve performance of <code>SPI_execute</code> and related functions, thereby improving PL/pgSQL's EXECUTE (Heikki Linnakangas, Tom Lane)</p>\n<p>Remove some data-copying overhead that was added in 9.2 as a consequence of revisions in the plan caching mechanism. This eliminates a performance regression compared to 9.1, and also saves memory, especially when the query string to be executed contains many SQL statements.</p>\n<p>A side benefit is that multi-statement query strings are now processed fully serially, that is we complete execution of earlier statements before running parse analysis and planning on the following ones. This eliminates a long-standing issue, in that DDL that should affect the behavior of a later statement will now behave as expected.</p>", "text": "Improve performance of SPI_execute and related functions, thereby improving PL/pgSQL's EXECUTE (Heikki Linnakangas, Tom Lane) Remove some data-copying overhead that was added in 9.2 as a consequence of revisions in the plan caching mechanism. This eliminates a performance regression compared to 9.1, and also saves memory, especially when the query string to be executed contains many SQL statements. A side benefit is that multi-statement query strings are now processed fully serially, that is we complete execution of earlier statements before running parse analysis and planning on the following ones. This eliminates a long-standing issue, in that DDL that should affect the behavior of a later statement will now behave as expected.", "title": "Improve performance of SPI_execute and related functions, thereby improving PL/pgSQL's EXECUTE", "commits": [], "section": "Changes", "category": "performance", "source_url": "/docs/release/9.2.3/#AEN113847", "source_hash": "3b188f95f2e2298985d52fd741408c37b8e205cc3bdc1feff5a6e8ed86d73d6c", "section_path": ["Changes"], "commit_groups": [], "identity_text": "Improve performance of SPI_execute and related functions, thereby improving PL/pgSQL's EXECUTE (Heikki Linnakangas, Tom Lane) Remove some data-copying overhead that was added in 9.2 as a consequence of revisions in the plan caching mechanism. This eliminates a performance regression compared to 9.1, and also saves memory, especially when the query string to be executed contains many SQL statements. A side benefit is that multi-statement query strings are now processed fully serially, that is we complete execution of earlier statements before running parse analysis and planning on the following ones. This eliminates a long-standing issue, in that DDL that should affect the behavior of a later statement will now behave as expected.", "commit_aliases": [], "source_commits": [], "source_entry_id": "9.2.3/changes/012", "db_id": "3d26e51a13dd46a8fb2e38b0d057876e", "patch_ids": [], "statement_hash": "d1f98b18f54e79bafa3099f39aca6bd298fb76d1c9ebef3c6bb9b39292d6a44d", "relations": [], "version": "9.2.3", "category_label": "Performance", "also_in": [], "variants": [], "related_changes": []}, {"id": "9.2.3-83584557aba7849f", "cves": [], "html": "<p>Restore pre-9.2 cost estimates for index usage (Tom Lane)</p>\n<p>An ill-considered change of a fudge factor led to undesirably high cost estimates for use of very large indexes.</p>", "text": "Restore pre-9.2 cost estimates for index usage (Tom Lane) An ill-considered change of a fudge factor led to undesirably high cost estimates for use of very large indexes.", "title": "Restore pre-9.2 cost estimates for index usage", "commits": [], "section": "Changes", "category": "improvement", "source_url": "/docs/release/9.2.3/#AEN113847", "source_hash": "f73f14faeabdd8773093bca06e528ad4a3f15b8845cba67efbd0bc15fe78af38", "section_path": ["Changes"], "commit_groups": [], "identity_text": "Restore pre-9.2 cost estimates for index usage (Tom Lane) An ill-considered change of a fudge factor led to undesirably high cost estimates for use of very large indexes.", "commit_aliases": [], "source_commits": [], "source_entry_id": "9.2.3/changes/013", "db_id": "1e5b81e7178d4a83772d00cb9c90480e", "patch_ids": [], "statement_hash": "92c24e3e97dc08112e87cf5bf298edde1836d56b9564d095e75e715b5a16768c", "relations": [], "version": "9.2.3", "category_label": "Improvements", "also_in": [], "variants": [], "related_changes": []}, {"id": "9.2.3-64d580e0bf52956f", "cves": [], "html": "<p>Fix intermittent crash in DROP INDEX CONCURRENTLY (Tom Lane)</p>", "text": "Fix intermittent crash in DROP INDEX CONCURRENTLY (Tom Lane)", "title": "Fix intermittent crash in DROP INDEX CONCURRENTLY", "commits": [], "section": "Changes", "category": "bugfix", "source_url": "/docs/release/9.2.3/#AEN113847", "source_hash": "bf4e7e2f60e8dcbe6521e737489b0b78bbfbcfa8d9350198dfc976e32850baac", "section_path": ["Changes"], "commit_groups": [], "identity_text": "Fix intermittent crash in DROP INDEX CONCURRENTLY (Tom Lane)", "commit_aliases": [], "source_commits": [], "source_entry_id": "9.2.3/changes/014", "db_id": "161f5fb8406ae52199447cf4e880fcbd", "patch_ids": [], "statement_hash": "b6881fcdb5b2479648d6578837c82ed545b1b3995237a96b8e9055ff325c3c90", "relations": [], "version": "9.2.3", "category_label": "Bug fixes", "also_in": [], "variants": [], "related_changes": []}, {"id": "9.2.3-b5632b3d5954013d", "cves": [], "html": "<p>Fix potential corruption of shared-memory lock table during CREATE/DROP INDEX CONCURRENTLY (Tom Lane)</p>", "text": "Fix potential corruption of shared-memory lock table during CREATE/DROP INDEX CONCURRENTLY (Tom Lane)", "title": "Fix potential corruption of shared-memory lock table during CREATE/DROP INDEX CONCURRENTLY", "commits": [], "section": "Changes", "category": "bugfix", "source_url": "/docs/release/9.2.3/#AEN113847", "source_hash": "7b2488779c6cb31969375fbd9829fe88547baf260d5309e0f67245d667c41647", "section_path": ["Changes"], "commit_groups": [], "identity_text": "Fix potential corruption of shared-memory lock table during CREATE/DROP INDEX CONCURRENTLY (Tom Lane)", "commit_aliases": [], "source_commits": [], "source_entry_id": "9.2.3/changes/015", "db_id": "86242974faaec1dc301a0af24478a8dd", "patch_ids": [], "statement_hash": "663ae8a0a2933e653a9bba9d18ffde9fe059652ef5bd22643367da8f8d230a65", "relations": [], "version": "9.2.3", "category_label": "Bug fixes", "also_in": [], "variants": [], "related_changes": []}, {"id": "9.2.3-209e8b52e74c3351", "cves": [], "html": "<p>Fix COPY's multiple-tuple-insertion code for the case of a tuple larger than page size minus fillfactor (Heikki Linnakangas)</p>\n<p>The previous coding could get into an infinite loop.</p>", "text": "Fix COPY's multiple-tuple-insertion code for the case of a tuple larger than page size minus fillfactor (Heikki Linnakangas) The previous coding could get into an infinite loop.", "title": "Fix COPY's multiple-tuple-insertion code for the case of a tuple larger than page size minus fillfactor", "commits": [], "section": "Changes", "category": "bugfix", "source_url": "/docs/release/9.2.3/#AEN113847", "source_hash": "b83329d514566227a4993926344e762c64f36b0a05c92c22c0d755b55768f043", "section_path": ["Changes"], "commit_groups": [], "identity_text": "Fix COPY's multiple-tuple-insertion code for the case of a tuple larger than page size minus fillfactor (Heikki Linnakangas) The previous coding could get into an infinite loop.", "commit_aliases": [], "source_commits": [], "source_entry_id": "9.2.3/changes/016", "db_id": "14f6e8c9f9ead49dfe599b13d5168589", "patch_ids": [], "statement_hash": "fcd5fe47a835ec08de6f8a8f9ce098a9fab155b08798c83ef5cdbec7e641680d", "relations": [], "version": "9.2.3", "category_label": "Bug fixes", "also_in": [], "variants": [], "related_changes": []}, {"id": "9.2.3-e66cf0eadcfcfaae", "cves": [], "html": "<p>Protect against race conditions when scanning pg_tablespace (Stephen Frost, Tom Lane)</p>\n<p>CREATE DATABASE and DROP DATABASE could misbehave if there were concurrent updates of pg_tablespace entries.</p>", "text": "Protect against race conditions when scanning pg_tablespace (Stephen Frost, Tom Lane) CREATE DATABASE and DROP DATABASE could misbehave if there were concurrent updates of pg_tablespace entries.", "title": "Protect against race conditions when scanning pg_tablespace", "commits": [], "section": "Changes", "category": "improvement", "source_url": "/docs/release/9.2.3/#AEN113847", "source_hash": "5ff82aa81813c538b10c1e7b22a4bf18e141a16b9c995ffce967c2ecb9fcc4b4", "section_path": ["Changes"], "commit_groups": [], "identity_text": "Protect against race conditions when scanning pg_tablespace (Stephen Frost, Tom Lane) CREATE DATABASE and DROP DATABASE could misbehave if there were concurrent updates of pg_tablespace entries.", "commit_aliases": [], "source_commits": [], "source_entry_id": "9.2.3/changes/017", "db_id": "4124539c48cb4ae98e125ea6487e211e", "patch_ids": [], "statement_hash": "f461ffca2349ac9eb5575bef8efe8af6be2c265a65f284d9e5e825a49f3cdae2", "relations": [{"rule": 2, "type": "equivalent", "target": "2f381663c3a7a7bdd131d724a1a19a0e", "evidence": {"same_day": true, "patch_ids": [], "statement_hash": "f461ffca2349ac9eb5575bef8efe8af6be2c265a65f284d9e5e825a49f3cdae2"}}, {"rule": 2, "type": "equivalent", "target": "94f35d956572a282768b13ff3370ea5b", "evidence": {"same_day": true, "patch_ids": [], "statement_hash": "f461ffca2349ac9eb5575bef8efe8af6be2c265a65f284d9e5e825a49f3cdae2"}}], "version": "9.2.3", "category_label": "Improvements", "also_in": [], "variants": [], "related_changes": [{"db_id": "94f35d956572a282768b13ff3370ea5b", "kind": "equivalent", "version": "9.1.8", "label": "9.1.8", "title": "Protect against race conditions when scanning pg_tablespace", "evidence": {"same_day": true, "patch_ids": [], "statement_hash": "f461ffca2349ac9eb5575bef8efe8af6be2c265a65f284d9e5e825a49f3cdae2"}, "url": "/docs/compare/?release=9.1.8#9.1.8-e66cf0eadcfcfaae", "source_url": "/docs/release/9.1.8/#AEN109130"}, {"db_id": "2f381663c3a7a7bdd131d724a1a19a0e", "kind": "equivalent", "version": "9.0.12", "label": "9.0.12", "title": "Protect against race conditions when scanning pg_tablespace", "evidence": {"same_day": true, "patch_ids": [], "statement_hash": "f461ffca2349ac9eb5575bef8efe8af6be2c265a65f284d9e5e825a49f3cdae2"}, "url": "/docs/compare/?release=9.0.12#9.0.12-e66cf0eadcfcfaae", "source_url": "/docs/release/9.0.12/#AEN100734"}]}, {"id": "9.2.3-4b068c0991eb5650", "cves": [], "html": "<p>Prevent DROP OWNED from trying to drop whole databases or tablespaces (Álvaro Herrera)</p>\n<p>For safety, ownership of these objects must be reassigned, not dropped.</p>", "text": "Prevent DROP OWNED from trying to drop whole databases or tablespaces (Álvaro Herrera) For safety, ownership of these objects must be reassigned, not dropped.", "title": "Prevent DROP OWNED from trying to drop whole databases or tablespaces", "commits": [], "section": "Changes", "category": "improvement", "source_url": "/docs/release/9.2.3/#AEN113847", "source_hash": "d9c83aaab2e664a263f83f14c989c447b35b6d1deae3f9eab497191c19eb25e1", "section_path": ["Changes"], "commit_groups": [], "identity_text": "Prevent DROP OWNED from trying to drop whole databases or tablespaces (Álvaro Herrera) For safety, ownership of these objects must be reassigned, not dropped.", "commit_aliases": [], "source_commits": [], "source_entry_id": "9.2.3/changes/018", "db_id": "fd69836f756ccf7e773d19a70c716b6f", "patch_ids": [], "statement_hash": "14ac52f7c4085a31a2f64a07f6bcff3dc98a49399939b3110e5e00c4fb9d7597", "relations": [{"rule": 2, "type": "equivalent", "target": "4591577da65e3adbae050099c8f44547", "evidence": {"same_day": true, "patch_ids": [], "statement_hash": "14ac52f7c4085a31a2f64a07f6bcff3dc98a49399939b3110e5e00c4fb9d7597"}}, {"rule": 2, "type": "equivalent", "target": "91872261cc4f61e151e9a7d0ad8c8923", "evidence": {"same_day": true, "patch_ids": [], "statement_hash": "14ac52f7c4085a31a2f64a07f6bcff3dc98a49399939b3110e5e00c4fb9d7597"}}], "version": "9.2.3", "category_label": "Improvements", "also_in": [], "variants": [], "related_changes": [{"db_id": "4591577da65e3adbae050099c8f44547", "kind": "equivalent", "version": "9.1.8", "label": "9.1.8", "title": "Prevent DROP OWNED from trying to drop whole databases or tablespaces", "evidence": {"same_day": true, "patch_ids": [], "statement_hash": "14ac52f7c4085a31a2f64a07f6bcff3dc98a49399939b3110e5e00c4fb9d7597"}, "url": "/docs/compare/?release=9.1.8#9.1.8-4b068c0991eb5650", "source_url": "/docs/release/9.1.8/#AEN109130"}, {"db_id": "91872261cc4f61e151e9a7d0ad8c8923", "kind": "equivalent", "version": "9.0.12", "label": "9.0.12", "title": "Prevent DROP OWNED from trying to drop whole databases or tablespaces", "evidence": {"same_day": true, "patch_ids": [], "statement_hash": "14ac52f7c4085a31a2f64a07f6bcff3dc98a49399939b3110e5e00c4fb9d7597"}, "url": "/docs/compare/?release=9.0.12#9.0.12-4b068c0991eb5650", "source_url": "/docs/release/9.0.12/#AEN100734"}]}, {"id": "9.2.3-cce3549773f6bb6b", "cves": [], "html": "<p>Fix error in <a href=\"/docs/9.2/runtime-config-client.html#GUC-VACUUM-FREEZE-TABLE-AGE\">vacuum_freeze_table_age</a> implementation (Andres Freund)</p>\n<p>In installations that have existed for more than <a href=\"/docs/9.2/runtime-config-client.html#GUC-VACUUM-FREEZE-MIN-AGE\">vacuum_freeze_min_age</a> transactions, this mistake prevented autovacuum from using partial-table scans, so that a full-table scan would always happen instead.</p>", "text": "Fix error in vacuum_freeze_table_age implementation 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