简介绑定变量分级(Bind Graduation)是指Oracle在PL/SQL代码中会根据文本型绑定变量的定义长度而将这些文本型绑定变量分为四个等级,不同等级分配的内存大小不同,如下表所示等级定义长度(Byte ... 阅读全文
相关等待事件介绍library cache lock和library cache: mutex X常常伴随出现,且会出现少量的cursor: mutex S和cursor: mutex X和curso ... 阅读全文
RAC 环境中最常见的 5 个数据库和/或实例性能问题 (Doc ID 1602076.1Top 5 Database and/or Instance Performance Issues in R ... 阅读全文
简介Why "Executions" and "Elap per Exec(s)" are 'Blank' in AWR for Some SQL Statem阅读全文
简介Library Cache Lock on Namespace SQL AREA BUILD(82) Caused by Failed Parse (Doc ID 2294281.1存储过程解析 ... 阅读全文
故障排除“cursor: pin S wait on X”等待事件 (Doc ID 2901617.1Troubleshooting 'cursor: pin S wait on X' waits. ... 阅读全文
GOAHard parse time may be impacted when there are a high number of parse errors.This may be noted i ... 阅读全文
APPLIES TOOracle Database Cloud Schema Service - Version N/A and lateOracle Database Exadata Expre ... 阅读全文
简介SQL 版本数过高 – 原因判断脚本 (Doc ID 1985045.1High SQL Version Counts - Script to determine reason(s) (Doc ... 阅读全文
【MOS】高版本数(>1024)的SQL语句在升级到12.2及更高版本后会导致数据库性能下降 (Doc ID 2469639.1High Version Counts For SQL Stateme ... 阅读全文

