Navicat可顯示多種性能指標(biāo)以幫助用戶監(jiān)控和優(yōu)化數(shù)據(jù)庫(kù)性能。其核心功能包括：1. 提供連接與會(huì)話實(shí)時(shí)數(shù)據(jù)，如當(dāng)前連接數(shù)、活躍會(huì)話數(shù)、會(huì)話運(yùn)行時(shí)間及來(lái)源信息，便于排查因連接過(guò)多導(dǎo)致的瓶頸；2. 展示查詢執(zhí)行時(shí)間、頻率與資源占用情況，并提供SQL執(zhí)行計(jì)劃，支持按耗時(shí)或頻率排序以定位低效查詢；3. 通過(guò)集成工具監(jiān)控服務(wù)器級(jí)資源使用情況，如CPU利用率、內(nèi)存消耗與磁盤I/O速度，區(qū)分性能問(wèn)題源于硬件還是查詢?cè)O(shè)計(jì)；4. 分析表與索引效率，包括表大小、行數(shù)、索引碎片率與緩存命中率，并建議重建低效索引以提升查詢速度。這些指標(biāo)為數(shù)據(jù)庫(kù)優(yōu)化提供了全面且直觀的數(shù)據(jù)支持。

Navicat can display a variety of performance metrics to help users monitor and optimize database performance. These metrics vary depending on the type of database you're working with (like MySQL, PostgreSQL, or SQL Server), but here are some common ones you’ll likely see.

1. Connection and Session Metrics

Navicat provides real-time data about current connections and active sessions. This includes how many users are connected, what queries they’re running, and how long those connections have been open.

• You can view details like:
  • Number of active vs. idle sessions
  • Time each session has been running
  • Which user or host initiated the connection

This is especially useful when troubleshooting slow performance — sometimes too many open connections can bottleneck your system.

2. Query Performance Statistics

One of the most commonly used features in Navicat for performance monitoring is its ability to show query execution time, frequency, and resource usage.

• For example, it can show:
  • Slowest queries over a given period
  • Queries that lock tables or take up high CPU
  • Execution plans for SQL statements

You can sort by duration or frequency to quickly spot inefficient queries that need optimization.

3. Resource Usage (CPU, Memory, Disk I/O)

If you're using Navicat Premium or a version integrated with a monitoring tool (like Navicat Monitor), you can also get insights into server-level resource usage.

• It typically displays:
  • Real-time CPU utilization
  • Memory consumption trends
  • Disk read/write speeds

These metrics help you understand whether performance issues stem from hardware limitations or poorly optimized queries.

4. Table and Index Efficiency

Navicat helps analyze table performance by showing metrics like:

• Table size and row count
• Index fragmentation levels
• Hit rates for cached data

For instance, if an index has low usage or high fragmentation, Navicat may suggest rebuilding or reorganizing it — which can significantly improve query speed.

In short, Navicat gives you a solid set of tools to monitor performance through connection stats, query behavior, server resources, and table efficiency. While the exact metrics depend on your database system, these views give you actionable insights without needing to write complex monitoring scripts yourself.基本上就這些。

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