A few X$ tables are mentioned in the documentation, but the vast majority are undocumented. For example X$BH is mentioned in the Oracle9i Performance Tuning Guide as well as the Oracle10g Performance Tuning Guide. The Oracle10g Warehouse Builder Installation and Administration Guide contains a procedure for resolving locking issues pertaining to the library cache by accessing X$KGLLK.1
KeywordsExecution Plan Control File True View Fixed View Password Hash
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