133 lines
3.1 KiB
Plaintext
133 lines
3.1 KiB
Plaintext
This utility allows administrators to view the file structure used by
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PostgreSQL. Databases are placed in directories based on their OIDs in
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pg_database, and the tables in that directory are named by original
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OIDs, stored in pg_class.relfilenode. Oid2name connects to the database
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and extracts the OID and table name information.
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---------------------------------------------------------------------------
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It can be used in four ways:
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oid2name
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This will connect to the template1 database and display all databases
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in the system:
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$ oid2name
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All databases:
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---------------------------------
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18720 = test1
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1 = template1
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18719 = template0
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18721 = test
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18735 = postgres
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18736 = cssi
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oid2name -d test [-x]
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This connects to the database test and shows all tables and their OIDs:
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$ oid2name -d test
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All tables from database "test":
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---------------------------------
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18766 = dns
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18737 = ips
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18722 = testdate
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oid2name -d test -o 18737
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oid2name -d test -t testdate
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This will connect to the database test and display the table name for oid
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18737 and the oid for table name testdate respectively:
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$ oid2name -d test -o 18737
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Tablename of oid 18737 from database "test":
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---------------------------------
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18737 = ips
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$ oid2name -d test -t testdate
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Oid of table testdate from database "test":
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---------------------------------
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18722 = testdate
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Keep in mind tables over one gigabyte will be split into separate files
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with numeric file extensions.
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---------------------------------------------------------------------------
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Sample session:
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$ cd /u/pg/data/base
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$ oid2name
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All databases:
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---------------------------------
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16817 = test2
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16578 = x
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16756 = test
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1 = template1
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16569 = template0
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16818 = test3
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16811 = floattest
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$ cd 16756
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$ ls 1873*
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18730 18731 18732 18735 18736 18737 18738 18739
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$ oid2name -d test -o 18737
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Tablename of oid 18737 from database "test":
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---------------------------------
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18737 = ips
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$ oid2name -d test -t ips
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Oid of table ips from database "test":
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---------------------------------
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18737 = ips
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$ # show disk space for every db object
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$ du * | while read SIZE OID
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> do
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> echo "$SIZE `oid2name -q -d test -o $OID`"
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> done
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24 18737 = ips
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36 18722 = cities
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...
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$ # same as above, but sort by largest first
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$ du * | while read SIZE OID
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> do
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> echo "$SIZE `oid2name -q -d test -o $OID`"
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> done |
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> sort -rn
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2048 19324 = bigtable
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1950 23903 = customers
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...
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$ # show disk usage per database
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$ cd /u/pg/data/base
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$ du -s * |
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> while read SIZE OID
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> do
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> echo "$SIZE `aspg oid2name -q | grep ^$OID' '`"
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> done |
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> sort -rn
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2256 18721 = test
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2135 18735 = postgres
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..
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This can be done in psql with:
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test=> SELECT relpages, relfilenode, relname FROM pg_class ORDER BY relpages DESC;
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Each page is typically 8k. Relpages is updated by VACUUM.
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---------------------------------------------------------------------------
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Mail me with any problems or additions you would like to see. Clearing
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house for the code will be at: http://www.crimelabs.net
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b. palmer, bpalmer@crimelabs.net
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