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- Profile and Monitor 9414
- Overview The JDBC driver exposes several ways to observe a running or completed query: cancelling and timing out queries, polling query progress, retrieving profiling output, and emitting memory-usage events through Java Flight Recorder . T
...ntifier, the jdbc_jfr_memory_monitor value. tag String DuckDB memory tag, such as BASE_TABLE , HASH_TABLE , or ALLOCATOR . dbAddress long Native address of the DuckDB instance, a stable per-instance identifier. memoryUsageBytes long Bytes currently alloca...ent. Stack traces are disabled for this event. Attribution The monitor is keyed on the native DuckDB instance address, the dbAddress field, not on the JDBC connection. There is one sample stream per distinct instance, so shared memory is not double-counte...st one closes; opening a new opted-in connection afterward starts a fresh monitor. Whether two getConnection calls share a dbAddress follows the same rules as instance caching : URL or operation Same dbAddress ? jdbc:duckdb: (unnamed in-memory) No — a fre... - https://man.mtool.work/duckdb/2.0/clients/java/profiling.html
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