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Tue, 05 Jul 2022 22:14:02 +0000 Content-Type: multipart/mixed; boundary="===============7656845463811107407==" MIME-Version: 1.0 Subject: BUG #17540: Prepared statement: PG switches to a generic query plan which is consistently much slower To: pgsql-bugs@lists.postgresql.org From: PG Bug reporting form Cc: william.duclot@gmail.com Reply-To: william.duclot@gmail.com, pgsql-bugs@lists.postgresql.org Date: Tue, 05 Jul 2022 22:13:15 +0000 Message-ID: <17540-7aa1855ad5ec18b4@postgresql.org> X-Auto-Response-Suppress: All Auto-Submitted: auto-generated List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk --===============7656845463811107407== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 VGhlIGZvbGxvd2luZyBidWcgaGFzIGJlZW4gbG9nZ2VkIG9uIHRoZSB3ZWJzaXRlOgoKQnVnIHJl ZmVyZW5jZTogICAgICAxNzU0MApMb2dnZWQgYnk6ICAgICAgICAgIFdpbGxpYW0gRHVjbG90CkVt YWlsIGFkZHJlc3M6ICAgICAgd2lsbGlhbS5kdWNsb3RAZ21haWwuY29tClBvc3RncmVTUUwgdmVy c2lvbjogMTQuNApPcGVyYXRpbmcgc3lzdGVtOiAgIEdOVS9MaW51eCAoUmVkIEhhdCA4LjUuMCkK RGVzY3JpcHRpb246ICAgICAgICAKCk15IGFwcGxpY2F0aW9uIHVzZXMgcHJlcGFyZWQgc3RhdGVt ZW50cy4gVGhpcyBzZWN0aW9uIG9mIHRoZSBkb2N1bWVudGF0aW9uCmlzIGdvaW5nIHRvIGJlIHZl cnkgcmVsZXZhbnQgdG8gdGhlIHJlc3Qgb2YgdGhpcyByZXBvcnQ6Cmh0dHBzOi8vd3d3LnBvc3Rn cmVzcWwub3JnL2RvY3MvY3VycmVudC9zcWwtcHJlcGFyZS5odG1sI1NRTC1QUkVQQVJFLU5PVEVT Lg0KDQpUaGlzIGlzIGEgbWluaW1hbCByZXByb2R1Y3Rpb24gb2YgdGhlIHByb2JsZW0gSSBvYnNl cnZlLCB3aGljaCBJIHdpbGwKZXhwbGFpbiBiZWxvdzoKaHR0cHM6Ly9kYmZpZGRsZS51ay8/cmRi bXM9cG9zdGdyZXNfMTQmZmlkZGxlPTZiMDFkMTYxZGEyNzM3OTg0NGU3NjAyYTE2NTQzNjI2DQoN ClNjZW5hcmlvOg0KLSBJIGNyZWF0ZSBhIGZhaXJseSBzaW1wbGUgdGFibGUgKGlkICsgdGltZXN0 YW1wKS4gVGltZXN0YW1wIGlzIGluZGV4ZWQuDQotIEkgY3JlYXRlIGEgc2ltcGxlLWlzaCBwcmVw YXJlZCBzdGF0ZW1lbnQgZm9yIGBTRUxFQ1QgTUlOKGlkKSwgTUFYKGlkKSBmcm9tCnJlbGF0aW9u X3R1cGxlX3RyYW5zYWN0aW9uIFdIRVJFIHRpbWVzdGFtcCA+PSAkMTtgDQotIEkgZXhlY3V0ZSB0 aGUgcHJlcGFyZWQgc3RhdGVtZW50IG11bHRpcGxlIHRpbWVzICg+IDUgdGltZXMpDQoNCkZyb20g dGhlIDZ0aCB0aW1lIG9ud2FyZHMsIHRoZSBxdWVyeSBwbGFuIHVzZWQgYnkgUG9zdGdyZXMgY2hh bmdlcywgd2hpY2gKaXNuJ3QgZnVsbHkgdW5leHBlY3RlZCBhcyB0aGUgZG9jdW1lbnRhdGlvbiBs aW5rZWQgYWJvdmUgZG9lcyBtYWtlIGl0IGNsZWFyCnRoYXQgUG9zdGdyZXMgbWlnaHQgZGVjaWRl IHRvIGNoYW5nZSB0aGUgcXVlcnkgcGxhbiBmb3IgYSBnZW5lcmljIHF1ZXJ5IHBsYW4KYWZ0ZXIg dGhlIDV0aCBleGVjdXRpb24uIEFuZCBpbmRlZWQsIHRoZSBlc3RpbWF0ZWQgImNvc3QiIG9mIHRo ZSBnZW5lcmljCnBsYW4gaXMgbG93ZXIgdGhhbiB0aGUgY3VzdG9tIHBsYW4nczogdGhlcmVmb3Jl IHRoZSBxdWVyeSBwbGFubmVyIGJlaGF2ZXMKY29ycmVjdGx5IGFjY29yZGluZyB0byB0aGUgZG9j dW1lbnRhdGlvbi4NCg0KTm93LCB0aGUgcHJvYmxlbTogdGhlIGV4ZWN1dGlvbiBvZiB0aGUgZ2Vu ZXJpYyBwbGFuIGlzIG11bHRpcGxlIG9yZGVycyBvZgptYWduaXR1ZGUgc2xvd2VyIHRoYW4gdGhl IGN1c3RvbSBxdWVyeSBwbGFuICgiYWN0dWFsIHRpbWUiIGZvciB0aGUgZ2VuZXJpYwpwbGFuIGlz IG92ZXIgNjUwMHggc2xvd2VyKSwgeWV0IFBvc3RncmVzIGRlY2lkZXMgdG8gc3RpY2sgd2l0aCB0 aGUgZ2VuZXJpYwpwbGFuLiBWZXJ5IHVuZXhwZWN0ZWQgZm9yIG1lOiBJIHdhcyB2ZXJ5IGhhcHB5 IHdpdGggdGhlIGZpcnN0IDUgcGxhbnMsIHlldApQb3N0Z3JlcyBkZWNpZGVzIHRvIGNoYW5nZSB0 aGUgcGxhbiBmb3IgYW5vdGhlciB0aGF0J3MgZW5vcm1vdXNseSBzbG93ZXIgYW5kCnN0aWNrIHdp dGggaXQuDQpHaXZpbmcgYSBkaWZmZXJlbnQgcGFyYW1ldGVyIHBhc3NlZCB0byB0aGUgcHJlcGFy ZWQgc3RhdGVtZW50IChlZyBgbm93KCkgLQppbnRlcnZhbCAnNSBkYXlzJ2ApIGRvZXMgZ2l2ZSBh ICJzbG93IiBjdXN0b20gcGxhbiAoc2ltaWxhciB0byB0aGUgZ2VuZXJpYwpwbGFuKS4gVGhpcyBt ZWFucyB0aGF0IHRoZSBxdWVyeSBwbGFubmVyIGRvZXMgbm90IHJlYWxpc2UgdGhhdCB0aGUgYWN0 dWFsCnBhcmFtZXRlciB2YWx1ZSBtYXR0ZXJzIGEgbG90LCBhbmQgdGhhdCB0aGUgcGFyYW1ldGVy cyB1c2VkIF9pbiBwcmFjdGljZV8KcmVzdWx0IGluIGEgZmFzdGVyIHBsYW4gdGhhbiB0aGUgZ2Vu ZXJpYyBwbGFuICgxMDAlIG9mIHRoZSBmaXJzdCA1CmV4ZWN1dGlvbnMpLCBhbmQgdGhhdCB0aGVy ZWZvcmUgaXQgc2hvdWxkbid0IHN0aWNrIHRvIHRoZSBnZW5lcmljIHBsYW4uDQoNCkl0IGlzIHBh cnRpY3VsYXJseSBpbnNpZGlvdXMgYXMgYWN0dWFsbHkgSSB3YXNuJ3QgZXZlbiBhd2FyZSBJIHdh cyB1c2luZwpwcmVwYXJlZCBzdGF0ZW1lbnRzLiBMaWtlIG1vc3QgYXBwbGljYXRpb25zIEkgdXNl IGEgZGF0YWJhc2UgZHJpdmVyIChwZ3gsIGluCkdvKSB3aGljaCBJIGxlYXJudCB1c2VzIGBQUWV4 ZWNQcmVwYXJlZGAgdW5kZXIgdGhlIGhvb2QsIHdoaWNoIGNyZWF0ZXMgYQpzb3J0IG9mICJ1bm5h bWVkIHByZXBhcmVkIHN0YXRlbWVudCIgYmVoYXZpbmcgdGhlIHNhbWUgYXMgdGhpcyBtaW5pbWFs CnJlcHJvZHVjdGlvbiB3aXRob3V0IG1lIGV2ZXIgYmVpbmcgYXdhcmUgdGhhdCBwcmVwYXJlZCBz dGF0ZW1lbnRzIGFyZQppbnZvbHZlZCBhbnl3aGVyZSBiZXR3ZWVuIG15IGNvZGUgYW5kIHRoZSBk YXRhYmFzZS4gVGhpcyBtYWtlcyBkZWJ1Z2dpbmcKdmVyeSBjb21wbGV4IGFzIHRoZXJlJ3Mgbm8g cmVhc29uIHRvIHN1c3BlY3QgYW55dGhpbmcKcHJlcGFyZWQtc3RhdGVtZW50LXJlbGF0ZWQgYW5k IGEgbWFudWFsIEVYUExBSU4gQU5BTFlaRSBvdXRzaWRlIG9mIGEKcHJlcGFyZWQgc3RhdGVtZW50 IHdvbid0IHNob3cgdGhlIHByb2JsZW0uDQoNCk5vdGU6IHNldHRpbmcgYHBsYW5fY2FjaGVfbW9k ZSA9IGZvcmNlX2N1c3RvbV9wbGFuYCBkYXRhYmFzZS13aWRlIHNvbHZlZCB0aGUKaW1tZWRpYXRl IHByb2JsZW0gYnV0IGlzIGEgd29ya2Fyb3VuZC4gSXQgd2FzIGEgdmVyeSB3ZWxjb21lIHdvcmth cm91bmQsCnRob3VnaC4KCg== --===============7656845463811107407==--