Index Advisor Components v13
The Index Advisor shared library interacts with the query planner to make indexing recommendations. On Windows, the Advanced Server installer creates the following shared library in the libdir
subdirectory of your Advanced Server home directory. For Linux, install the edb-asxx-server-indexadvisor
RPM package where xx
is the Advanced Server version number.
On Linux:
index_advisor.so
On Windows:
index_advisor.dll
Please note that libraries in the libdir
directory can only be loaded by a superuser. A database administrator can allow a non-superuser to use Index Advisor by manually copying the Index Advisor file from the libdir
directory into the libdir/plugins
directory (under your Advanced Server home directory). Only a trusted non-superuser should be allowed access to the plugin; this is an unsafe practice in a production environment.
The installer also creates the Index Advisor utility program and setup script:
pg_advise_index
pg_advise_index
is a utility program that reads a user-supplied input file containing SQL queries and produces a text file containing CREATE INDEX
statements that can be used to create the indexes recommended by the Index Advisor. The pg_advise_index
program is located in the bin
subdirectory of the Advanced Server home directory.
Note
pg_advise_index
asks the backend process to load the index_advisor plugin first from $libdir/plugins
. If not found, then it writes the error in the server log file and attempts to load from $libdir
.
index_advisor_log
Index Advisor logs indexing recommendations in the index_advisor_log
table. If Index Advisor does not find the index_advisor_log
table in the user's search path, Index Advisor will store any indexing recommendations in a temporary table of the same name. The temporary table exists only for the duration of the current session.
show_index_recommendations()
show_index_recommendations()
is a PL/pgSQL function that interprets and displays the recommendations made during a specific Index Advisor session (as identified by its backend process ID).
index_recommendations
Index Advisor creates the index_recommendations
view based on information stored in the index_advisor_log
table during a query analysis. The view produces output in the same format as the show_index_recommendations()
function, but contains Index Advisor recommendations for all stored sessions, while the result set returned by the show_index_recommendations()
function are limited to a specified session.