Hello everyone I am currently testing the migration of my web server to PHP 8.2.13 and mariadb 11.2.2. During my tests, I got stuck on a SELECT problem on tables using spatial indexes. During a complex page chaining several CREATE TABLEs on temporary tables with spatial indexes, a SELECT planted with the message "update lock cannot be acquired during a READ UNCOMMITTED transaction". After consulting Google, I first unblocked the situation by removing the spatial indexes on temporary tables but then the performance of intermediate queries collapsed. In the end, after doing a test package, I definitely found a solution: the default database engine is innodb. By forcing the myisam engine on the temporary tables the page executes in a few seconds! Questions: - what to think of this use case of spatial indexes with innodb vs myisa? - Is this a bug? Below are the DMLs for queries with myisam explicitly indicated. With innodb, the last query in the list crashes, either timeout if I execute via php, or "update lock cannot be acquired during a READ UNCOMMITTED transaction" if I execute the query via phpmyadmin 1 CREATE TABLE TEMPTABLE_localites_du_site(Localite_unik_commune int, Localite_dept varchar(15), Localite_unik int, GPS_unik int, Type_Localite varchar(1), Localite_p_coordonnees_spacial point not null) ENGINE = myisam ; 0 0 2 ALTER TABLE TEMPTABLE_localites_du_site ADD SPATIAL INDEX IDX_temptable_localites_du_site_Localite_p_coordonnees_spacial(Localite_p_coordonnees_spacial); 0 0 1 CREATE TABLE WKWNat_2A2B50F4_415A_443F_A959_38AB2F0EC1C6 (Localite_unik_commune int, Localite_dept varchar(15), Localite_unik int, GPS_unik int, Type_Localite varchar(1), Localite_p_coordonnees_spacial point, Maille_unik int, Maille_unik_site int, Maille_maille varchar(80), Maille_taille int, Maille_g_coordonnees_spacial geometry NOT NULL, Maille_couleur_bordure int, Maille_couleur_aire int, Maille_transparence_aire int, Maille_Exclusion bit NOT NULL, Longitude_Centre double(10,6), Latitude_Centre double(10,6), in_use_by_leudit bit NOT NULL, myTaille varchar(3)) ENGINE = myisam; 0 0 5 insert INTO TEMPTABLE_localites_du_site (SELECT DISTINCT wnat_lieuxdits.unik_commune, wnat_communes.Dept, wnat_lieuxdits.unik AS unik_lieudit, NULL AS unik_gps, 'L' AS Type_Localite, wnat_lieuxdits.p_coordonnees_spacial FROM wnat_lieuxdits INNER JOIN wnat_inventaires ON wnat_inventaires.unik_lieudit = wnat_lieuxdits.unik INNER JOIN wnat_communes ON wnat_communes.unik = wnat_lieuxdits.unik_commune WHERE wnat_inventaires.unik_organisme=10 AND ST_CONTAINS(ST_PolygonFromText('POLYGON((41.36475929466526 8.54315203804477,43.0275854970405 8.54315203804477,43.0275854970405 9.555702267296203,41.36475929466526 9.555702267296203,41.36475929466526 8.54315203804477))'),wnat_lieuxdits.p_coordonnees_spacial) ) 0 788 6 insert INTO TEMPTABLE_localites_du_site (SELECT DISTINCT wnat_lieuxdits.unik_commune, wnat_communes.Dept, wnat_lieuxdits.unik AS unik_lieudit, wnat_gps.unik AS unik_gps, 'G' AS Type_Localite, wnat_gps.p_coordonnees_spacial FROM wnat_lieuxdits INNER JOIN wnat_gps ON wnat_lieuxdits.unik = wnat_gps.unik_lieudit INNER JOIN wnat_inventaires ON wnat_gps.unik = wnat_inventaires.unik_gps INNER JOIN wnat_communes ON wnat_communes.unik = wnat_lieuxdits.unik_commune WHERE wnat_inventaires.unik_organisme=10 AND ST_CONTAINS(ST_PolygonFromText('POLYGON((41.36475929466526 8.54315203804477,43.0275854970405 8.54315203804477,43.0275854970405 9.555702267296203,41.36475929466526 9.555702267296203,41.36475929466526 8.54315203804477))'),wnat_gps.p_coordonnees_spacial) ) 0 29566 7 DELETE TEMPTABLE_localites_du_site FROM TEMPTABLE_localites_du_site INNER JOIN wnat_lieuxdits ON ( TEMPTABLE_localites_du_site.Localite_unik = wnat_lieuxdits.unik) INNER JOIN wnat_communes ON (wnat_lieuxdits.unik_commune = wnat_communes.unik) where wnat_communes.unik_organisme<>10 0 0 765 CREATE TABLE TEMPTABLE_W1 ENGINE = myisam AS SELECT MAX(wnat_geometries_mailles.taille) AS max_taille FROM TEMPTABLE_localites_du_site INNER JOIN wnat_geometries_mailles ON ST_CONTAINS(wnat_geometries_mailles.g_coordonnees_spacial, TEMPTABLE_localites_du_site.Localite_p_coordonnees_spacial) WHERE wnat_geometries_mailles.unik_geometrie_objet IN (121332,121333,121334,121335,121419,121385,121376,121383,121449,121450,121345,121373,121370,121371,121317,121379,121355,121362,121363,121367,121372,121346,121347,121348,121349,121365,121366,121378,121442,121443,121444,121448,121411,121404,121325,121406,121315,121392,121393,121394,121395,121396,121391,121343,121344,121407,121388,121389,121412,121413,121414,121415,121420,121421,121422,121423,121424,121322,121318,121319,121320,121321,121369,121360,121361,121426,121427,121428,121429,121430,121431,121432,121327,121356,121357,121405,121316,121408,121409,121425,121375,121351,121350,121323,121384,121390,121364,121324,121416,121417,121418,121368,121386,121387,121352,121447,121440,121441,121433,121434,121435,121328,121329,121330,121331,121446,121374,121451,121397,121377,121445,121382,121336,121337,121338,121339,121340,121341,121342,121436,121437,121438,121353,121354,121380,121381,121439,121326,121398,121399,121400,121401,121402,121403,121410,121358,121359,-1) AND wnat_geometries_mailles.Exclusion = FALSE; 0 1 query_Recordset1 insert INTO WKWNat_2A2B50F4_415A_443F_A959_38AB2F0EC1C6 (SELECT TEMPTABLE_localites_du_site.Localite_unik_commune, TEMPTABLE_localites_du_site.Localite_dept, TEMPTABLE_localites_du_site.Localite_unik, TEMPTABLE_localites_du_site.GPS_unik, TEMPTABLE_localites_du_site.Type_Localite, TEMPTABLE_localites_du_site.Localite_p_coordonnees_spacial, wnat_geometries_mailles.unik, wnat_geometries_mailles.unik_geometrie_objet, wnat_geometries_mailles.maille, wnat_geometries_mailles.taille, wnat_geometries_mailles.g_coordonnees_spacial, wnat_geometries_mailles.couleur_bordure, wnat_geometries_mailles.couleur_aire, wnat_geometries_mailles.transparence_aire, wnat_geometries_mailles.Exclusion, wnat_geometries_mailles.longitude_centre, wnat_geometries_mailles.latitude_centre, 1, MAX_TAILLE.max_taille AS myTaille FROM TEMPTABLE_localites_du_site INNER JOIN wnat_geometries_mailles ON ST_CONTAINS(wnat_geometries_mailles.g_coordonnees_spacial, TEMPTABLE_localites_du_site.Localite_p_coordonnees_spacial) INNER JOIN TEMPTABLE_W1 as MAX_TAILLE ON wnat_geometries_mailles.taille = MAX_TAILLE.max_taille WHERE wnat_geometries_mailles.unik_geometrie_objet IN (121332,121333,121334,121335,121419,121385,121376,121383,121449,121450,121345,121373,121370,121371,121317,121379,121355,121362,121363,121367,121372,121346,121347,121348,121349,121365,121366,121378,121442,121443,121444,121448,121411,121404,121325,121406,121315,121392,121393,121394,121395,121396,121391,121343,121344,121407,121388,121389,121412,121413,121414,121415,121420,121421,121422,121423,121424,121322,121318,121319,121320,121321,121369,121360,121361,121426,121427,121428,121429,121430,121431,121432,121327,121356,121357,121405,121316,121408,121409,121425,121375,121351,121350,121323,121384,121390,121364,121324,121416,121417,121418,121368,121386,121387,121352,121447,121440,121441,121433,121434,121435,121328,121329,121330,121331,121446,121374,121451,121397,121377,121445,121382,121336,121337,121338,121339,121340,121341,121342,121436,121437,121438,121353,121354,121380,121381,121439,121326,121398,121399,121400,121401,121402,121403,121410,121358,121359,-1) AND wnat_geometries_mailles.Exclusion = FALSE and in_use_by_lieudit<>0); 8 insert INTO WKWNat_2A2B50F4_415A_443F_A959_38AB2F0EC1C6 (SELECT TEMPTABLE_localites_du_site.Localite_unik_commune, TEMPTABLE_localites_du_site.Localite_dept, TEMPTABLE_localites_du_site.Localite_unik, TEMPTABLE_localites_du_site.GPS_unik, TEMPTABLE_localites_du_site.Type_Localite, TEMPTABLE_localites_du_site.Localite_p_coordonnees_spacial, wnat_geometries_mailles.unik, wnat_geometries_mailles.unik_geometrie_objet, wnat_geometries_mailles.maille, wnat_geometries_mailles.taille, wnat_geometries_mailles.g_coordonnees_spacial, wnat_geometries_mailles.couleur_bordure, wnat_geometries_mailles.couleur_aire, wnat_geometries_mailles.transparence_aire, wnat_geometries_mailles.Exclusion, wnat_geometries_mailles.longitude_centre, wnat_geometries_mailles.latitude_centre, 1, MAX_TAILLE.max_taille AS myTaille FROM TEMPTABLE_localites_du_site INNER JOIN wnat_geometries_mailles ON ST_CONTAINS(wnat_geometries_mailles.g_coordonnees_spacial, TEMPTABLE_localites_du_site.Localite_p_coordonnees_spacial) INNER JOIN TEMPTABLE_W1 as MAX_TAILLE ON wnat_geometries_mailles.taille = MAX_TAILLE.max_taille WHERE wnat_geometries_mailles.unik_geometrie_objet IN (121332,121333,121334,121335,121419,121385,121376,121383,121449,121450,121345,121373,121370,121371,121317,121379,121355,121362,121363,121367,121372,121346,121347,121348,121349,121365,121366,121378,121442,121443,121444,121448,121411,121404,121325,121406,121315,121392,121393,121394,121395,121396,121391,121343,121344,121407,121388,121389,121412,121413,121414,121415,121420,121421,121422,121423,121424,121322,121318,121319,121320,121321,121369,121360,121361,121426,121427,121428,121429,121430,121431,121432,121327,121356,121357,121405,121316,121408,121409,121425,121375,121351,121350,121323,121384,121390,121364,121324,121416,121417,121418,121368,121386,121387,121352,121447,121440,121441,121433,121434,121435,121328,121329,121330,121331,121446,121374,121451,121397,121377,121445,121382,121336,121337,121338,121339,121340,121341,121342,121436,121437,121438,121353,121354,121380,121381,121439,121326,121398,121399,121400,121401,121402,121403,121410,121358,121359,-1) AND wnat_geometries_mailles.Exclusion = FALSE and in_use_by_lieudit<>0); 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