如何解决Mongodb聚合查询性能较差
我正在尝试进行汇总复杂查询。但是查询需要4-5秒。其实没有多少数据，但我必须使用5个查询。我的查询如下；
db.getCollection("pairpercentages").explain('executionStats').aggregate([
{
$match: {
percentage: {
$gt: 0,},updatedate: {
$gte: ISODate("2020-08-13T09:52:51.427+03:00"),{
$lookup: {
from: "filtereditems",let: {
pair_src: "$pair",buy_src: "$buy",sell_src: "$sell",percentage_src: "$percentage",buycontractaddress_src: "$buycontractaddress",sellcontractaddress_src: "$sellcontractaddress",pipeline: [
{
$match: {
$and: [
{
$expr: {
$or: [
{
$eq: ["$$pair_src","$pair"],{
$eq: ["$pair","ALL"],],{
$expr: {
$or: [
{
$eq: ["$$buy_src","$buy"],{
$eq: ["$buy",{
$expr: {
$or: [
{
$eq: ["$$sell_src","$sell"],{
$eq: ["$sell",{
$expr: {
$lt: ["$$percentage_src","$percentage"],{
$expr: {
$or: [
{
$eq: ["$contractaddress",""]
},{
$eq: ["$$buycontractaddress_src","$contractaddress"],{
$eq: ["$$sellcontractaddress_src",{
$eq: ["$contractaddress",as: "filtered",{
$match: {
filtered: {
$eq: [],{
$lookup: {
from: "alarmitems",pipeline: [
{
$match: {
$expr: {
$and: [
{
$eq: ["$$pair_src",{
$eq: ["$$buy_src",{
$eq: ["$$sell_src",as: "specialAlarmfilterCounter",{
$addFields: {
specialAlarmFilterExists: {
$cond: {
if: { $gt: [{ $size: "$specialAlarmfilterCounter" },0] },then: true,else: false,specialAlarmFilterExists: "$specialAlarmFilterExists",{
$gt: ["$$percentage_src",as: "specialAlarmfilter",{
$addFields: {
specialAlarm: {
$cond: {
if: {
$and: [
{ $gt: [{ $size: "$specialAlarmfilter" },{ $eq: ["$specialAlarmFilterExists",true] },then: 1,else: 0,pipeline: [
{
$match: {
$and: [
{
$expr: {
$or: [
{
$eq: ["$$specialAlarmFilterExists",false],{
$expr: {
$or: [
{
$eq: ["$$pair_src",as: "alarmfilterCounter",{
$addFields: {
allAlarmFilterExists: {
$cond: {
if: { $gt: [{ $size: "$alarmfilterCounter" },allAlarmFilterExists: "$allAlarmFilterExists",{
$expr: {
$gt: ["$$percentage_src",{
$expr: {
$eq: ["$$allAlarmFilterExists",true],as: "alarmfilter",{
$addFields: {
allAlarm: {
$cond: {
if: { $gt: [{ $size: "$alarmfilter" },{
$match: {
$or: [
{
$and: [
{ percentage: { $gt: 0 } },{ specialAlarmFilterExists: { $eq: false } },{ allAlarmFilterExists: { $eq: false } },{ specialAlarm: { $gt: 0 } },{ allAlarm: { $gt: 0 } },{
$project: {
alarmfilter: 0,filtered: 0,specialAlarmfilter: 0,specialAlarm: 0,specialAlarmFilterExists: 0,allAlarm: 0,alarmfilter: 0,allAlarmFilterExists: 0,specialAlarmfilterCounter: 0,alarmfilterCounter: 0,updatedate: 0,buydate: 0,selldate: 0,buycontractaddress: 0,sellcontractaddress: 0,buymultiple: 0,sellmultiple: 0
},{ $sort : { percentage : 1} }
])
我为配对百分比，过滤和警报文档创建索引，如下所示。
db.pairpercentages.createIndex( { percentage: 1,updatedate: 1,pair: 1,buy: 1,sell: 1} );
db.pairpercentages.createIndex( { percentage: 1,updatedate: 1} );
db.filtereditems.createIndex( { buy: 1,sell: 1,user: 1,percentage: 1,contractaddress:1} );
db.alarmitems.createIndex( { buy: 1,user:1,contractaddress:1} );
但是当我查看执行统计信息时，我发现它花费了太多时间，如下所示。
"executionStats" : {
"executionSuccess" : true,"nReturned" : 3298.0,"executionTimeMillis" : 4432.0,"totalKeysExamined" : 3298.0,"totalDocsExamined" : 3298.0,我在哪里做错了？我该怎么解决？
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