diff --git a/Makefile.in b/Makefile.in
index 891329719a..61d4d671ce 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -376,6 +376,7 @@ TESTSRC = \
   $(TOP)/src/test_autoext.c \
   $(TOP)/src/test_async.c \
   $(TOP)/src/test_backup.c \
+  $(TOP)/src/test_bestindex.c \
   $(TOP)/src/test_blob.c \
   $(TOP)/src/test_btree.c \
   $(TOP)/src/test_config.c \
@@ -1051,6 +1052,7 @@ TESTFIXTURE_FLAGS  = -DTCLSH=1 -DSQLITE_TEST=1 -DSQLITE_CRASH_TEST=1
 TESTFIXTURE_FLAGS += -DSQLITE_SERVER=1 -DSQLITE_PRIVATE="" -DSQLITE_CORE 
 TESTFIXTURE_FLAGS += -DBUILD_sqlite
 TESTFIXTURE_FLAGS += -DSQLITE_SERIES_CONSTRAINT_VERIFY=1
+TESTFIXTURE_FLAGS += -DSQLITE_DEFAULT_PAGE_SIZE=1024
 
 TESTFIXTURE_SRC0 = $(TESTSRC2) libsqlite3.la
 TESTFIXTURE_SRC1 = sqlite3.c
diff --git a/Makefile.msc b/Makefile.msc
index d9af285c06..59ce3c2ec2 100644
--- a/Makefile.msc
+++ b/Makefile.msc
@@ -1236,6 +1236,7 @@ TESTSRC = \
   $(TOP)\src\test_autoext.c \
   $(TOP)\src\test_async.c \
   $(TOP)\src\test_backup.c \
+  $(TOP)\src\test_bestindex.c \
   $(TOP)\src\test_blob.c \
   $(TOP)\src\test_btree.c \
   $(TOP)\src\test_config.c \
@@ -1926,6 +1927,7 @@ TESTFIXTURE_FLAGS = -DTCLSH=1 -DSQLITE_TEST=1 -DSQLITE_CRASH_TEST=1
 TESTFIXTURE_FLAGS = $(TESTFIXTURE_FLAGS) -DSQLITE_SERVER=1 -DSQLITE_PRIVATE=""
 TESTFIXTURE_FLAGS = $(TESTFIXTURE_FLAGS) -DSQLITE_CORE $(NO_WARN)
 TESTFIXTURE_FLAGS = $(TESTFIXTURE_FLAGS) -DSQLITE_SERIES_CONSTRAINT_VERIFY=1
+TESTFIXTURE_FLAGS = $(TESTFIXTURE_FLAGS) -DSQLITE_DEFAULT_PAGE_SIZE=1024
 
 TESTFIXTURE_SRC0 = $(TESTEXT) $(TESTSRC2)
 TESTFIXTURE_SRC1 = $(TESTEXT) $(SQLITE3C)
diff --git a/config.h.in b/config.h.in
index 36fd60781c..f2ba7d4fc4 100644
--- a/config.h.in
+++ b/config.h.in
@@ -45,6 +45,18 @@
 /* Define to 1 if you have the <memory.h> header file. */
 #undef HAVE_MEMORY_H
 
+/* Define to 1 if you have the pread() function. */
+#undef HAVE_PREAD
+
+/* Define to 1 if you have the pread64() function. */
+#undef HAVE_PREAD64
+
+/* Define to 1 if you have the pwrite() function. */
+#undef HAVE_PWRITE
+
+/* Define to 1 if you have the pwrite64() function. */
+#undef HAVE_PWRITE64
+
 /* Define to 1 if you have the <stdint.h> header file. */
 #undef HAVE_STDINT_H
 
diff --git a/configure b/configure
index 09fba81eae..8363818c6f 100755
--- a/configure
+++ b/configure
@@ -10273,7 +10273,7 @@ done
 #########
 # Figure out whether or not we have these functions
 #
-for ac_func in fdatasync gmtime_r isnan localtime_r localtime_s malloc_usable_size strchrnul usleep utime
+for ac_func in fdatasync gmtime_r isnan localtime_r localtime_s malloc_usable_size strchrnul usleep utime pread pread64 pwrite pwrite64
 do :
   as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
 ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
diff --git a/configure.ac b/configure.ac
index 19f85dc875..08c8867f06 100644
--- a/configure.ac
+++ b/configure.ac
@@ -108,7 +108,7 @@ AC_CHECK_HEADERS([sys/types.h stdlib.h stdint.h inttypes.h malloc.h])
 #########
 # Figure out whether or not we have these functions
 #
-AC_CHECK_FUNCS([fdatasync gmtime_r isnan localtime_r localtime_s malloc_usable_size strchrnul usleep utime])
+AC_CHECK_FUNCS([fdatasync gmtime_r isnan localtime_r localtime_s malloc_usable_size strchrnul usleep utime pread pread64 pwrite pwrite64])
 
 #########
 # By default, we use the amalgamation (this may be changed below...)
diff --git a/main.mk b/main.mk
index 97dc254378..2ea493d111 100644
--- a/main.mk
+++ b/main.mk
@@ -728,6 +728,7 @@ sqlite3_analyzer$(EXE): sqlite3_analyzer.c
 TESTFIXTURE_FLAGS  = -DSQLITE_TEST=1 -DSQLITE_CRASH_TEST=1
 TESTFIXTURE_FLAGS += -DSQLITE_SERVER=1 -DSQLITE_PRIVATE="" -DSQLITE_CORE
 TESTFIXTURE_FLAGS += -DSQLITE_SERIES_CONSTRAINT_VERIFY=1
+TESTFIXTURE_FLAGS += -DSQLITE_DEFAULT_PAGE_SIZE=1024
 
 testfixture$(EXE): $(TESTSRC2) libsqlite3.a $(TESTSRC) $(TOP)/src/tclsqlite.c
 	$(TCCX) $(TCL_FLAGS) -DTCLSH=1 $(TESTFIXTURE_FLAGS)                  \
diff --git a/manifest b/manifest
index 9f2d2fdb74..58b8efaa39 100644
--- a/manifest
+++ b/manifest
@@ -1,8 +1,8 @@
-C Get\sin-memory\ssubjournals\sworking\sfor\sbuilds\swithout\sSQLITE_ENABLE_ATOMIC_WRITE.
-D 2016-03-04T00:13:29.040
-F Makefile.in e335453db0b16da00c884ad51bb56d1c091a74de
+C Merge\schanges\sfrom\strunk.
+D 2016-03-04T13:08:35.636
+F Makefile.in ead489fe5d3313b8a2a8d5f3710173a4b50dd2e0
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
-F Makefile.msc dbd4621ecc585c2ef0c2aa0874698c54675754f1
+F Makefile.msc d68db8ddac21ea2576ea5b446f12cf9ebe897a03
 F README.md 8ecc12493ff9f820cdea6520a9016001cb2e59b7
 F VERSION c6b1f51809551d60ad001e6d87cf3ab2c7f54b6f
 F aclocal.m4 a5c22d164aff7ed549d53a90fa56d56955281f50
@@ -28,10 +28,10 @@ F autoconf/tea/win/makefile.vc f89d0184d0eee5f7e356ea407964dcd139939928
 F autoconf/tea/win/nmakehlp.c 247538ad8e8c508f33c03ec1fbd67d3a07ef6291
 F autoconf/tea/win/rules.vc c511f222b80064096b705dbeb97060ee1d6b6d63
 F config.guess 226d9a188c6196f3033ffc651cbc9dcee1a42977
-F config.h.in 42b71ad3fe21c9e88fa59e8458ca1a6bc72eb0c0
+F config.h.in 6376abec766e9a0785178b1823b5a587e9f1ccbc
 F config.sub 9ebe4c3b3dab6431ece34f16828b594fb420da55
-F configure 0339a635cd2943a3b56000a10a11b4b2e6ed6d1b x
-F configure.ac a2224b1162f79848982d3618ac1deffcd94e88ec
+F configure c01a159fdf7ea0171ad01ce2937283f2c7972bde x
+F configure.ac 89e4e02a83d8a1528011f8395621b8c3186b4089
 F contrib/sqlitecon.tcl 210a913ad63f9f991070821e599d600bd913e0ad
 F doc/lemon.html c30255bea0fd87a81f082d17a72c9dffbc3f6dd9
 F doc/pager-invariants.txt 27fed9a70ddad2088750c4a2b493b63853da2710
@@ -273,7 +273,7 @@ F ext/userauth/userauth.c 5fa3bdb492f481bbc1709fc83c91ebd13460c69e
 F install-sh 9d4de14ab9fb0facae2f48780b874848cbf2f895 x
 F ltmain.sh 3ff0879076df340d2e23ae905484d8c15d5fdea8
 F magic.txt 8273bf49ba3b0c8559cb2774495390c31fd61c60
-F main.mk 518d93f9f606d515628f99ce03f9e909f4f8a2e3
+F main.mk d9982cb6a42b1c9da7d61cebae973cd6b034de61
 F mkso.sh fd21c06b063bb16a5d25deea1752c2da6ac3ed83
 F mptest/config01.test 3c6adcbc50b991866855f1977ff172eb6d901271
 F mptest/config02.test 4415dfe36c48785f751e16e32c20b077c28ae504
@@ -333,7 +333,7 @@ F src/os.c f89e3ca1c2e3d5015b847aec60371c474acbac82
 F src/os.h 3e57a24e2794a94d3cf2342c6d9a884888cd96bf
 F src/os_common.h b2f4707a603e36811d9b1a13278bffd757857b85
 F src/os_setup.h c9d4553b5aaa6f73391448b265b89bed0b890faa
-F src/os_unix.c 3a6f20736dfb8a0949cdd66553fdf59f6604be35
+F src/os_unix.c f5bac8e74aaefc4ea520e43b4540793c3b8a9e8f
 F src/os_win.c f0d7aa603eb6262143d7169a222aea07c4fca91d
 F src/os_win.h eb7a47aa17b26b77eb97e4823f20a00b8bda12ca
 F src/pager.c 2bc43817697b5a4e88fd6a2cdb2cb25f2223505c
@@ -355,7 +355,7 @@ F src/sqlite.h.in 57d2a02b14c9ec4f7cb294153eaf62294dc5aa68
 F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
 F src/sqlite3ext.h dfbe62ffd95b99afe2140d8c35b180d11924072d
 F src/sqliteInt.h 8a4810fa90b17eb08acab43649b877e894ea1e98
-F src/sqliteLimit.h 216557999cb45f2e3578ed53ebefe228d779cb46
+F src/sqliteLimit.h 7b28cf72cbd52f178bfc97ea266445e351f2cd24
 F src/status.c 70912d7be68e9e2dbc4010c93d344af61d4c59ba
 F src/table.c 5226df15ab9179b9ed558d89575ea0ce37b03fc9
 F src/tclsqlite.c 54dca4eaf3a9cb0a4b845ef54ffa99225c30a52e
@@ -1453,7 +1453,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 55c00f716dc98b188c91f3a5a010242c9497785f
-R 9e3fbc3007cf6215e63dd7896623508e
+P b5378dcea53d4cd1744d13ddee5e50869607b771 2682e8e413fadbca0673f242769af17bfd291559
+R 1d5f238c78a751f41b8ce4e327b6fc98
 U drh
-Z 727109808ff36a69d33c43dee6d82c50
+Z 35e5851abb6d53f81aa001148a407eb0
diff --git a/manifest.uuid b/manifest.uuid
index 7f1e0b5ee4..7ae252503c 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-b5378dcea53d4cd1744d13ddee5e50869607b771
\ No newline at end of file
+a87305dfd49ee17632d0bce66ce7c2e9407b7b3e
\ No newline at end of file
diff --git a/src/os_unix.c b/src/os_unix.c
index ea07bd99f3..d6fbd80588 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -71,6 +71,19 @@
 #  endif
 #endif
 
+/* Use pread() and pwrite() if they are available */
+#if defined(__APPLE__)
+# define HAVE_PREAD 1
+# define HAVE_PWRITE 1
+#endif
+#if defined(HAVE_PREAD64) && defined(HAVE_PWRITE64)
+# undef USE_PREAD
+# define USE_PREAD64 1
+#elif defined(HAVE_PREAD) && defined(HAVE_PWRITE)
+# undef USE_PREAD64
+# define USE_PREAD 1
+#endif
+
 /*
 ** standard include files.
 */
diff --git a/src/sqliteLimit.h b/src/sqliteLimit.h
index 75cad1274b..4b5ddaadec 100644
--- a/src/sqliteLimit.h
+++ b/src/sqliteLimit.h
@@ -102,12 +102,12 @@
 ** the main database table and for temporary tables.
 **
 ** IMPLEMENTATION-OF: R-31093-59126 The default suggested cache size
-** is 2000 pages.
+** is 2000*1024 bytes.
 ** IMPLEMENTATION-OF: R-48205-43578 The default suggested cache size can be
 ** altered using the SQLITE_DEFAULT_CACHE_SIZE compile-time options.
 */
 #ifndef SQLITE_DEFAULT_CACHE_SIZE
-# define SQLITE_DEFAULT_CACHE_SIZE  2000
+# define SQLITE_DEFAULT_CACHE_SIZE  -2000
 #endif
 
 /*
@@ -120,8 +120,9 @@
 
 /*
 ** The maximum number of attached databases.  This must be between 0
-** and 62.  The upper bound on 62 is because a 64-bit integer bitmap
-** is used internally to track attached databases.
+** and 125.  The upper bound of 125 is because the attached databases are
+** counted using a signed 8-bit integer which has a maximum value of 127
+** and we have to allow 2 extra counts for the "main" and "temp" databases.
 */
 #ifndef SQLITE_MAX_ATTACHED
 # define SQLITE_MAX_ATTACHED 10
@@ -156,7 +157,7 @@
 ** The default size of a database page.
 */
 #ifndef SQLITE_DEFAULT_PAGE_SIZE
-# define SQLITE_DEFAULT_PAGE_SIZE 1024
+# define SQLITE_DEFAULT_PAGE_SIZE 4096
 #endif
 #if SQLITE_DEFAULT_PAGE_SIZE>SQLITE_MAX_PAGE_SIZE
 # undef SQLITE_DEFAULT_PAGE_SIZE