问题：使用plsql连接服务器的数据库时发现Oracle不能发问了，提示什么我也记不得了。远程观察Oracle的监听进程发现监听进程居然达
问题：使用plsql连接服务器的数据库时发现Oracle不能发问了，提示什么我也记不得了。
远程观察Oracle的监听进程发现监听进程居然达到2G左右。重启监听或重启服务器后，监听内存由刚开始的6M左右，半个小时左右逐渐增加到2G左右
日志提示错误：
11-1月 -2010 10:55:45 * 12546
TNS-12546: TNS: 拒绝许可
TNS-12560: TNS: 协议适配器错误
TNS-00516: 拒绝许可
TNS-01168: 无法分配内存
11-1月 -2010 10:56:26 * 1168
解决：
由于本人对Oracle 设置了ip限定。非信任列表中的IP疯狂访问，就会产生这种情况。
Oracle版本原为9.2.0.1后升级为9.2.0.3。
我在本机上测试如果升级为9.2.0.8就不会产生这种问题了！
How does MySQL handle concurrency compared to other RDBMS?Apr 29, 2025 am 12:44 AMMySQLhandlesconcurrencyusingamixofrow-levelandtable-levellocking,primarilythroughInnoDB'srow-levellocking.ComparedtootherRDBMS,MySQL'sapproachisefficientformanyusecasesbutmayfacechallengeswithdeadlocksandlacksadvancedfeatureslikePostgreSQL'sSerializa
How does MySQL handle transactions compared to other relational databases?Apr 29, 2025 am 12:37 AMMySQLhandlestransactionseffectivelyusingtheInnoDBengine,supportingACIDpropertiessimilartoPostgreSQLandOracle.1)MySQLusesREPEATABLEREADasthedefaultisolationlevel,whichcanbeadjustedtoREADCOMMITTEDforhigh-trafficscenarios.2)Itoptimizesperformancewithabu
How does MySQL differ from PostgreSQL?Apr 29, 2025 am 12:23 AMMySQLisbetterforspeedandsimplicity,suitableforwebapplications;PostgreSQLexcelsincomplexdatascenarioswithrobustfeatures.MySQLisidealforquickprojectsandread-heavytasks,whilePostgreSQLispreferredforapplicationsrequiringstrictdataintegrityandadvancedSQLf
How does MySQL handle data replication?Apr 28, 2025 am 12:25 AMMySQL processes data replication through three modes: asynchronous, semi-synchronous and group replication. 1) Asynchronous replication performance is high but data may be lost. 2) Semi-synchronous replication improves data security but increases latency. 3) Group replication supports multi-master replication and failover, suitable for high availability requirements.
How can you use the EXPLAIN statement to analyze query performance?Apr 28, 2025 am 12:24 AMThe EXPLAIN statement can be used to analyze and improve SQL query performance. 1. Execute the EXPLAIN statement to view the query plan. 2. Analyze the output results, pay attention to access type, index usage and JOIN order. 3. Create or adjust indexes based on the analysis results, optimize JOIN operations, and avoid full table scanning to improve query efficiency.
How do you back up and restore a MySQL database?Apr 28, 2025 am 12:23 AMUsing mysqldump for logical backup and MySQLEnterpriseBackup for hot backup are effective ways to back up MySQL databases. 1. Use mysqldump to back up the database: mysqldump-uroot-pmydatabase>mydatabase_backup.sql. 2. Use MySQLEnterpriseBackup for hot backup: mysqlbackup--user=root-password=password--backup-dir=/path/to/backupbackup. When recovering, use the corresponding life
What are some common causes of slow queries in MySQL?Apr 28, 2025 am 12:18 AMThe main reasons for slow MySQL query include missing or improper use of indexes, query complexity, excessive data volume and insufficient hardware resources. Optimization suggestions include: 1. Create appropriate indexes; 2. Optimize query statements; 3. Use table partitioning technology; 4. Appropriately upgrade hardware.
What are views in MySQL?Apr 28, 2025 am 12:04 AMMySQL view is a virtual table based on SQL query results and does not store data. 1) Views simplify complex queries, 2) Enhance data security, and 3) Maintain data consistency. Views are stored queries in databases that can be used like tables, but data is generated dynamically.
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.
EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function
SublimeText3 Chinese version
Chinese version, very easy to use
ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment
SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.
