How does one monitor and trace Unix processes? To trace what a Unix process is doing enter: truss -rall -wall -p truss -p $ lsnrctl dbsnmp_start NOTE: The “truss” command works on SUN and Sequent. Use “tusc” on HP-UX, “strace” on Linux, “trace” on SCO Unix or call your system administrator to find the equivalent…
Make sure the entry for your database SID in the ORATAB file ends in a capital “Y”. Eg: # $ORACLE_SID:$ORACLE_HOME:[N|Y] # ORCL:/u01/app/oracle/product/8.0.5:Y # The scripts for starting and stopping databases are: $ORACLE_HOME/bin/dbstart and dbshut. SQL*Net (or Net8) is started with the lsnrctl command. Add the following entries to your /etc/rc2.d/S99dbstart (or equivalent) file: su –…
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How does one list all installed Oracle products? One can display all installed products with version information by executing one of the following commands. For Oracle7 up to 8.0: cd $ORACLE_HOME/orainst ./inspdver For Oracle 8i and above: cd $ORACLE_HOME/install cat unix.rgs
Can one export directly to a tape drive? —————————————– One can use a tape device name instead of a normal file name. When using a device, one also needs to specify the VOLSIZE= parameter. Look at this example: exp userid/password file=/dev/rmt0 table=emp volsize=1.2G Note: The volume size is a number ending with a “m”, “k”,…
If one cannot afford to buy extra disk space one can run the export and compress utilities simultaneously. This will prevent the need to get enough space for both the export file AND the compressed export file. Eg: # Make a pipe mknod expdat.dmp p # or mkfifo pipe # Start compress sucking on the…
This example uses the Unix split command to create multiple files, each smaller than the Unix (and imp/exp) 2 Gigabyte file size limit. This method can typically be used for import, export and SQL*Loader operations. cd /tmp/data rm exp.dmp mknod exp.dmp p # mkfifo on certain Unix flavours split -b2047m /tmp/data/exp.dmp & imp scott/tiger file=/tmp/data/exp.dmp…
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One can select a value from a database column directly into a Unix environment variable. Look at the following shell script examples: #!/bin/sh VALUE=`sqlplus -silent user/password@instance
Metalink Performance Library Index
BENEFITS of Locally Managed Tablespaces ————————————— Locally managed tablespaces track all extent information in the tablespace itself, using bitmaps, resulting in the following benefits: * Improved concurrency and speed of space operations, because space allocations and deallocations predominantly modify locally managed resources (bitmaps stored in header files) rather than requiring centrally managed resources such as…
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True Session Wait Activity in Oracle 10g ======================================== Catching a session waiting on a resource used to be hit or miss. Let’s take a look at how Oracle has helped give us a better mousetrap for seeing the waits experienced by sessions. It used to be that a DBA would sit in front of the…
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