在 MySQL/PostgreSQL/Oracle/MSSQL 中，每个执行的查询总是有持续时间“查询在 0.23 毫秒内完成”或“已用 0.001 秒”，或者至少在显示“EXPLAIN”或“EXPLAIN ANALYZE”时显示时间。如何在 tarantool 客户端中执行此操作？ (tarantoolctl 连接 3301)
例如 EXPLAIN QUERY PLAN 根本不显示时间:
box.execute "explain query plan \nWITH sc AS ( -- shown count\n\tSELECT \"ref_id\"\n\t\t, \"view_count\"\n\tFROM \"userlistings\"\n\tWHERE \"user_id\" = 'af07e444-44f3-4116-833e-90af7f24ffa0'\n), msc AS (\n\tSELECT GREATEST(1,MAX(\"view_count\")) \"max_view\"\n\tFROM sc\n)\n, \nopq AS ( \n\tSELECT \"cat_id\"\n\t\t, \"click_interest\" -- SPEC-Q\n\t\t, \"purchase_interest\" -- SPEC-P\n\t\t, \"message_interest\" -- SPEC-O\n\tFROM \"usercats\"\n\tWHERE \"user_id\" = 'af07e444-44f3-4116-833e-90af7f24ffa0'\n), mopq AS (\n\tSELECT GREATEST(1,MAX(\"click_interest\")) \"max_click\"\n\t\t, GREATEST(1,MAX(\"purchase_interest\")) \"max_purchase\"\n\t\t, GREATEST(1,MAX(\"message_interest\")) \"max_inquiry\"\n\tFROM opq\n)\nSELECT \"initial_cache\" \n+ (IFNULL(msc.\"max_view\",1) - IFNULL(sc.\"view_count\",0)) / IFNULL(msc.\"max_view\",1) * 100.0 * 5.28000020980835/100.010002136\n+ ((180-abs(\"lat\" - -5.796658992767334))/360.0 + (360-abs(\"long\" - 106.49927520751953))/720.0) * 100.0 * 22.280000686645508/100.010002136\n+ IFNULL(\"message_interest\",0) / IFNULL(mopq.\"max_inquiry\",1) * 100.0 * 0/100.010002136\n+ IFNULL(\"purchase_interest\",0) / IFNULL(mopq.\"max_purchase\",1) * 100.0 * 5.28000020980835/100.010002136\n+ IFNULL(\"click_interest\",0) / IFNULL(mopq.\"max_click\",1) * 100.0 * 0/100.010002136, *\nFROM \"listings\"\n\nLEFT JOIN sc\n\tON \"listings\".\"ref_id\" = sc.\"ref_id\"\nCROSS JOIN msc\n\nLEFT JOIN opq\n\tON \"listings\".\"categories\" = opq.\"cat_id\"\nCROSS JOIN mopq\n\nWHERE \"ref_type\" = 1\nORDER BY 1 DESC LIMIT 5 OFFSET 0"
---
- metadata:
- name: selectid
type: integer
- name: order
type: integer
- name: from
type: integer
- name: detail
type: text
rows:
- [1, 0, 0, 'SEARCH TABLE userlistings USING PRIMARY KEY (user_id=?) (~10 rows)']
- [2, 0, 0, 'SEARCH TABLE userlistings USING PRIMARY KEY (user_id=?) (~10 rows)']
- [3, 0, 0, 'SEARCH TABLE usercats USING PRIMARY KEY (user_id=?) (~10 rows)']
- [4, 0, 0, 'SEARCH TABLE usercats USING PRIMARY KEY (user_id=?) (~10 rows)']
- [0, 0, 0, 'SEARCH TABLE listings USING COVERING INDEX ref_type (ref_type=?) (~10
rows)']
- [0, 1, 1, 'SCAN SUBQUERY 1 (~1 row)']
- [0, 2, 2, 'SCAN SUBQUERY 2 (~1 row)']
- [0, 3, 3, 'SCAN SUBQUERY 3 (~1 row)']
- [0, 4, 4, 'SCAN SUBQUERY 4 (~1 row)']
- [0, 0, 0, 'USE TEMP B-TREE FOR ORDER BY']
...
或者在 EXPLAIN 中也不显示任何时间/持续时间:
box.execute "explain \nWITH sc AS ( -- shown count\n\tSELECT \"ref_id\"\n\t\t, \"view_count\"\n\tFROM \"userlistings\"\n\tWHERE \"user_id\" = 'af07e444-44f3-4116-833e-90af7f24ffa0'\n), msc AS (\n\tSELECT GREATEST(1,MAX(\"view_count\")) \"max_view\"\n\tFROM sc\n)\n, \nopq AS ( \n\tSELECT \"cat_id\"\n\t\t, \"click_interest\" -- SPEC-Q\n\t\t, \"purchase_interest\" -- SPEC-P\n\t\t, \"message_interest\" -- SPEC-O\n\tFROM \"usercats\"\n\tWHERE \"user_id\" = 'af07e444-44f3-4116-833e-90af7f24ffa0'\n), mopq AS (\n\tSELECT GREATEST(1,MAX(\"click_interest\")) \"max_click\"\n\t\t, GREATEST(1,MAX(\"purchase_interest\")) \"max_purchase\"\n\t\t, GREATEST(1,MAX(\"message_interest\")) \"max_inquiry\"\n\tFROM opq\n)\nSELECT \"initial_cache\" \n+ (IFNULL(msc.\"max_view\",1) - IFNULL(sc.\"view_count\",0)) / IFNULL(msc.\"max_view\",1) * 100.0 * 5.28000020980835/100.010002136\n+ ((180-abs(\"lat\" - -5.796658992767334))/360.0 + (360-abs(\"long\" - 106.49927520751953))/720.0) * 100.0 * 22.280000686645508/100.010002136\n+ IFNULL(\"message_interest\",0) / IFNULL(mopq.\"max_inquiry\",1) * 100.0 * 0/100.010002136\n+ IFNULL(\"purchase_interest\",0) / IFNULL(mopq.\"max_purchase\",1) * 100.0 * 5.28000020980835/100.010002136\n+ IFNULL(\"click_interest\",0) / IFNULL(mopq.\"max_click\",1) * 100.0 * 0/100.010002136, *\nFROM \"listings\"\n\nLEFT JOIN sc\n\tON \"listings\".\"ref_id\" = sc.\"ref_id\"\nCROSS JOIN msc\n\nLEFT JOIN opq\n\tON \"listings\".\"categories\" = opq.\"cat_id\"\nCROSS JOIN mopq\n\nWHERE \"ref_type\" = 1\nORDER BY 1 DESC LIMIT 5 OFFSET 0"
---
- metadata:
- name: addr
type: integer
- name: opcode
type: text
- name: p1
type: integer
- name: p2
type: integer
- name: p3
type: integer
- name: p4
type: text
- name: p5
type: text
- name: comment
type: text
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...
原始查询(以前使用像 (SELECT "max_click"FROM mopq) 这样的子查询，但与 CROSS JOIN 相比，它提供更长的 explain:
WITH sc AS ( -- shown count
SELECT "ref_id"
, "view_count"
FROM "userlistings"
WHERE "user_id" = 'af07e444-44f3-4116-833e-90af7f24ffa0'
), msc AS (
SELECT GREATEST(1,MAX("view_count")) "max_view"
FROM sc
)
,
opq AS (
SELECT "cat_id"
, "click_interest" -- SPEC-Q
, "purchase_interest" -- SPEC-P
, "message_interest" -- SPEC-O
FROM "usercats"
WHERE "user_id" = 'af07e444-44f3-4116-833e-90af7f24ffa0'
), mopq AS (
SELECT GREATEST(1,MAX("click_interest")) "max_click"
, GREATEST(1,MAX("purchase_interest")) "max_purchase"
, GREATEST(1,MAX("message_interest")) "max_inquiry"
FROM opq
)
SELECT "initial_cache"
+ (IFNULL(msc."max_view",1) - IFNULL(sc."view_count",0)) / IFNULL(msc."max_view",1) * 100.0 * 5.28000020980835/100.010002136
+ ((180-abs("lat" - -5.796658992767334))/360.0 + (360-abs("long" - 106.49927520751953))/720.0) * 100.0 * 22.280000686645508/100.010002136
+ IFNULL("message_interest",0) / IFNULL(mopq."max_inquiry",1) * 100.0 * 0/100.010002136
+ IFNULL("purchase_interest",0) / IFNULL(mopq."max_purchase",1) * 100.0 * 5.28000020980835/100.010002136
+ IFNULL("click_interest",0) / IFNULL(mopq."max_click",1) * 100.0 * 0/100.010002136, *
FROM "listings"
LEFT JOIN sc
ON "listings"."ref_id" = sc."ref_id"
CROSS JOIN msc
LEFT JOIN opq
ON "listings"."categories" = opq."cat_id"
CROSS JOIN mopq
WHERE "ref_type" = 1
ORDER BY 1 DESC LIMIT 5 OFFSET 0
这个查询的持续时间有点奇怪(在 go 程序中测量，但每次我需要更改查询时部署都会花费很多时间):
ref_type = 1 (3538 rows) 587ms
ref_type = 5 ( 886 rows) 142ms
ref_type = 3 ( 104 rows) 9ms
ref_type = 6 (1608 rows) 276ms
最佳答案
同意这很不幸且不方便，我们计划在相当短的时间内让它变得更加方便。
作为今天的变通方法，我建议您启用 VDBE_PROFILE 并重新编译 Tarantool，这将生成带有运行时信息注释的 VDBE 查询日志，这些查询已执行到 vdbe_profile.out 文件，您会在其中看到计时和计数器。
diff --git a/src/box/CMakeLists.txt b/src/box/CMakeLists.txt
index 999ac4749..0126f5af3 100644
--- a/src/box/CMakeLists.txt
+++ b/src/box/CMakeLists.txt
@@ -222,6 +222,7 @@ if(CMAKE_BUILD_TYPE STREQUAL "Debug")
add_definitions(-DSQL_DEBUG=1)
endif()
add_definitions(-DSQL_TEST=1)
+add_definitions(-DVDBE_PROFILE=1)
set(EXT_SRC_DIR ${CMAKE_SOURCE_DIR}/extra)
set(EXT_BIN_DIR ${CMAKE_BINARY_DIR}/extra)
关于query-optimization - 如何像在其他 DBMS 中一样在 Tarantool 中获取查询时间，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/65994255/