HINT: WAL control functions cannot be executed during recovery. However, in the following example the function foo() results in WAL file activity, so will always cause a WAL file switch: postgres=# SELECT pg_walfile_name(pg_switch_wal()), foo(), pg_walfile_name(pg_switch_wal()) If there has been no activity which generated WAL since the last WAL file switch, a new WAL file will not be created: postgres=# SELECT pg_walfile_name(pg_switch_wal()), pg_walfile_name(pg_switch_wal()) For example the option -Xlog:gc:file=gc.txt logs the messages to the gc.txt file.Basic usage example for pg_switch_wal(): postgres=# SELECT pg_switch_wal() Logs messages with the gc tag to the file name specified. Prints detailed deduplication statistics.Įnables printing of tenuring age information.Įnables printing of detailed messages at every GC. The shipping address is Geox SPA c/o Xlog srl, Signoressa di Trevignano, 31040. A few tags are listed in the following rows.Įnables the printing of information about the regions that are allocated and that are reclaimed by the G1 collector.Įnables printing of information about adaptive generation sizing.Įnables printing of the time elapsed from the last pause (for example, a GC pause).Įnables printing of time stamps for every individual GC worker thread task.Įnables printing of time stamps at every GC using the decorators uptime and tid. Contact your preferred courier service to organise shipment of the return. The gc tag is combined with other tags to log specific information. For option 2, be sure to remove the unrecognized options for Java 11 from the list above. The gc is the main tag to log all GC related information. Either add the following JVM option to the setenv.sh or setenv.bat file (option 1), or convert the GC options to the new Xlog format (option 2). Table 5-3 GC Logging Options GC Logging OptionsĮnables printing of messages at every GC. The following table lists various logging options available in Oracle JRockit and compares them with the options available in HotSpot: Table 5-1 Verbose Logging HotSpot Logging Options These are some of the common logging options available in HotSpot that can be used to enable the diagnostic output for a specific subsystem within the HotSpot JVM. By default, this option is disabled.Įnables printing of locks after a Control+C event (SIGTERM). This option enables you to view the methods that are getting inlined.Įnables printing of a class instance histogram after a Control+C event (SIGTERM). This option must be used together with the -XX:UnlockDiagnosticVMOptions option that unlocks diagnostic JVM options.Įnables verbose diagnostic output from the JVM by printing a message to the console every time a method is compiled.Įnables printing of inlining decisions. This option enables you to view the generated code, which helps you to diagnose the performance issues. Note:This option was deprecated in JDK 9.Įnables printing of collected native memory tracking data at JVM exit when native memory tracking is enabled.Įnables printing of assembly code resulting from JIT compilation of Java bytecode by using the external disassembler.so library.
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